Summary: Per request from @nkg-, temporarily print thread ID when a thread terminates. It is a temp solution as we try to minimized stderr messages. Test Plan: env_test Reviewers: haobo, igor, dhruba Reviewed By: igor CC: nkg-, leveldb Differential Revision: https://reviews.facebook.net/D18753
1723 lines
47 KiB
C++
1723 lines
47 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include <deque>
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#include <set>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#ifdef OS_LINUX
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#include <sys/statfs.h>
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#if defined(OS_LINUX)
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#include <linux/fs.h>
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#include <fcntl.h>
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#endif
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#if defined(LEVELDB_PLATFORM_ANDROID)
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#include <sys/stat.h>
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#endif
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#include "rocksdb/env.h"
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#include "rocksdb/slice.h"
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#include "port/port.h"
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#include "util/coding.h"
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#include "util/logging.h"
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#include "util/posix_logger.h"
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#include "util/random.h"
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#include <signal.h>
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// Get nano time for mach systems
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#ifdef __MACH__
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#include <mach/clock.h>
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#include <mach/mach.h>
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#endif
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#if !defined(TMPFS_MAGIC)
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#define TMPFS_MAGIC 0x01021994
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#endif
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#if !defined(XFS_SUPER_MAGIC)
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#define XFS_SUPER_MAGIC 0x58465342
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#endif
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#if !defined(EXT4_SUPER_MAGIC)
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#define EXT4_SUPER_MAGIC 0xEF53
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#endif
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// For non linux platform, the following macros are used only as place
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// holder.
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#ifndef OS_LINUX
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#define POSIX_FADV_NORMAL 0 /* [MC1] no further special treatment */
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#define POSIX_FADV_RANDOM 1 /* [MC1] expect random page refs */
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#define POSIX_FADV_SEQUENTIAL 2 /* [MC1] expect sequential page refs */
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#define POSIX_FADV_WILLNEED 3 /* [MC1] will need these pages */
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#define POSIX_FADV_DONTNEED 4 /* [MC1] dont need these pages */
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#endif
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// This is only set from db_stress.cc and for testing only.
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// If non-zero, kill at various points in source code with probability 1/this
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int rocksdb_kill_odds = 0;
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namespace rocksdb {
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namespace {
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// A wrapper for fadvise, if the platform doesn't support fadvise,
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// it will simply return Status::NotSupport.
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int Fadvise(int fd, off_t offset, size_t len, int advice) {
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#ifdef OS_LINUX
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return posix_fadvise(fd, offset, len, advice);
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#else
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return 0; // simply do nothing.
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#endif
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}
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// list of pathnames that are locked
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static std::set<std::string> lockedFiles;
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static port::Mutex mutex_lockedFiles;
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static Status IOError(const std::string& context, int err_number) {
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return Status::IOError(context, strerror(err_number));
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}
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#ifdef NDEBUG
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// empty in release build
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#define TEST_KILL_RANDOM(rocksdb_kill_odds)
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#else
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// Kill the process with probablity 1/odds for testing.
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static void TestKillRandom(int odds, const std::string& srcfile,
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int srcline) {
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time_t curtime = time(nullptr);
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Random r((uint32_t)curtime);
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assert(odds > 0);
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bool crash = r.OneIn(odds);
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if (crash) {
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fprintf(stdout, "Crashing at %s:%d\n", srcfile.c_str(), srcline);
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fflush(stdout);
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kill(getpid(), SIGTERM);
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}
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}
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// To avoid crashing always at some frequently executed codepaths (during
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// kill random test), use this factor to reduce odds
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#define REDUCE_ODDS 2
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#define REDUCE_ODDS2 4
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#define TEST_KILL_RANDOM(rocksdb_kill_odds) { \
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if (rocksdb_kill_odds > 0) { \
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TestKillRandom(rocksdb_kill_odds, __FILE__, __LINE__); \
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} \
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}
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#endif
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#if defined(OS_LINUX)
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namespace {
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static size_t GetUniqueIdFromFile(int fd, char* id, size_t max_size) {
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if (max_size < kMaxVarint64Length*3) {
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return 0;
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}
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struct stat buf;
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int result = fstat(fd, &buf);
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if (result == -1) {
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return 0;
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}
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long version = 0;
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result = ioctl(fd, FS_IOC_GETVERSION, &version);
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if (result == -1) {
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return 0;
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}
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uint64_t uversion = (uint64_t)version;
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char* rid = id;
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rid = EncodeVarint64(rid, buf.st_dev);
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rid = EncodeVarint64(rid, buf.st_ino);
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rid = EncodeVarint64(rid, uversion);
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assert(rid >= id);
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return static_cast<size_t>(rid-id);
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}
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}
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#endif
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class PosixSequentialFile: public SequentialFile {
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private:
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std::string filename_;
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FILE* file_;
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int fd_;
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bool use_os_buffer_;
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public:
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PosixSequentialFile(const std::string& fname, FILE* f,
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const EnvOptions& options)
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: filename_(fname), file_(f), fd_(fileno(f)),
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use_os_buffer_(options.use_os_buffer) {
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}
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virtual ~PosixSequentialFile() { fclose(file_); }
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virtual Status Read(size_t n, Slice* result, char* scratch) {
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Status s;
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size_t r = 0;
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do {
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r = fread_unlocked(scratch, 1, n, file_);
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} while (r == 0 && ferror(file_) && errno == EINTR);
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*result = Slice(scratch, r);
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if (r < n) {
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if (feof(file_)) {
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// We leave status as ok if we hit the end of the file
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// We also clear the error so that the reads can continue
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// if a new data is written to the file
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clearerr(file_);
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} else {
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// A partial read with an error: return a non-ok status
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s = IOError(filename_, errno);
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}
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}
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if (!use_os_buffer_) {
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// we need to fadvise away the entire range of pages because
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// we do not want readahead pages to be cached.
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Fadvise(fd_, 0, 0, POSIX_FADV_DONTNEED); // free OS pages
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}
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return s;
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}
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virtual Status Skip(uint64_t n) {
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if (fseek(file_, n, SEEK_CUR)) {
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return IOError(filename_, errno);
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}
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return Status::OK();
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}
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virtual Status InvalidateCache(size_t offset, size_t length) {
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#ifndef OS_LINUX
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return Status::OK();
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#else
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// free OS pages
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int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);
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if (ret == 0) {
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return Status::OK();
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}
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return IOError(filename_, errno);
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#endif
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}
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};
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// pread() based random-access
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class PosixRandomAccessFile: public RandomAccessFile {
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private:
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std::string filename_;
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int fd_;
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bool use_os_buffer_;
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public:
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PosixRandomAccessFile(const std::string& fname, int fd,
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const EnvOptions& options)
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: filename_(fname), fd_(fd), use_os_buffer_(options.use_os_buffer) {
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assert(!options.use_mmap_reads);
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}
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virtual ~PosixRandomAccessFile() { close(fd_); }
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virtual Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const {
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Status s;
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ssize_t r = -1;
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do {
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r = pread(fd_, scratch, n, static_cast<off_t>(offset));
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} while (r < 0 && errno == EINTR);
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*result = Slice(scratch, (r < 0) ? 0 : r);
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if (r < 0) {
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// An error: return a non-ok status
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s = IOError(filename_, errno);
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}
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if (!use_os_buffer_) {
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// we need to fadvise away the entire range of pages because
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// we do not want readahead pages to be cached.
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Fadvise(fd_, 0, 0, POSIX_FADV_DONTNEED); // free OS pages
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}
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return s;
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}
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#ifdef OS_LINUX
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virtual size_t GetUniqueId(char* id, size_t max_size) const {
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return GetUniqueIdFromFile(fd_, id, max_size);
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}
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#endif
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virtual void Hint(AccessPattern pattern) {
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switch(pattern) {
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case NORMAL:
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Fadvise(fd_, 0, 0, POSIX_FADV_NORMAL);
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break;
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case RANDOM:
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Fadvise(fd_, 0, 0, POSIX_FADV_RANDOM);
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break;
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case SEQUENTIAL:
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Fadvise(fd_, 0, 0, POSIX_FADV_SEQUENTIAL);
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break;
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case WILLNEED:
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Fadvise(fd_, 0, 0, POSIX_FADV_WILLNEED);
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break;
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case DONTNEED:
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Fadvise(fd_, 0, 0, POSIX_FADV_DONTNEED);
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break;
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default:
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assert(false);
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break;
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}
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}
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virtual Status InvalidateCache(size_t offset, size_t length) {
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#ifndef OS_LINUX
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return Status::OK();
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#else
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// free OS pages
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int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);
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if (ret == 0) {
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return Status::OK();
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}
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return IOError(filename_, errno);
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#endif
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}
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};
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// mmap() based random-access
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class PosixMmapReadableFile: public RandomAccessFile {
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private:
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int fd_;
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std::string filename_;
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void* mmapped_region_;
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size_t length_;
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public:
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// base[0,length-1] contains the mmapped contents of the file.
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PosixMmapReadableFile(const int fd, const std::string& fname,
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void* base, size_t length,
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const EnvOptions& options)
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: fd_(fd), filename_(fname), mmapped_region_(base), length_(length) {
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fd_ = fd_ + 0; // suppress the warning for used variables
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assert(options.use_mmap_reads);
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assert(options.use_os_buffer);
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}
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virtual ~PosixMmapReadableFile() {
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int ret = munmap(mmapped_region_, length_);
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if (ret != 0) {
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fprintf(stdout, "failed to munmap %p length %zu \n",
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mmapped_region_, length_);
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}
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}
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virtual Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const {
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Status s;
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if (offset + n > length_) {
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*result = Slice();
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s = IOError(filename_, EINVAL);
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} else {
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*result = Slice(reinterpret_cast<char*>(mmapped_region_) + offset, n);
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}
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return s;
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}
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virtual Status InvalidateCache(size_t offset, size_t length) {
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#ifndef OS_LINUX
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return Status::OK();
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#else
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// free OS pages
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int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);
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if (ret == 0) {
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return Status::OK();
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}
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return IOError(filename_, errno);
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#endif
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}
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};
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// We preallocate up to an extra megabyte and use memcpy to append new
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// data to the file. This is safe since we either properly close the
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// file before reading from it, or for log files, the reading code
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// knows enough to skip zero suffixes.
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class PosixMmapFile : public WritableFile {
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private:
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std::string filename_;
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int fd_;
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size_t page_size_;
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size_t map_size_; // How much extra memory to map at a time
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char* base_; // The mapped region
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char* limit_; // Limit of the mapped region
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char* dst_; // Where to write next (in range [base_,limit_])
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char* last_sync_; // Where have we synced up to
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uint64_t file_offset_; // Offset of base_ in file
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// Have we done an munmap of unsynced data?
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bool pending_sync_;
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#ifdef ROCKSDB_FALLOCATE_PRESENT
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bool fallocate_with_keep_size_;
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#endif
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// Roundup x to a multiple of y
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static size_t Roundup(size_t x, size_t y) {
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return ((x + y - 1) / y) * y;
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}
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size_t TruncateToPageBoundary(size_t s) {
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s -= (s & (page_size_ - 1));
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assert((s % page_size_) == 0);
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return s;
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}
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bool UnmapCurrentRegion() {
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bool result = true;
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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if (base_ != nullptr) {
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if (last_sync_ < limit_) {
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// Defer syncing this data until next Sync() call, if any
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pending_sync_ = true;
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}
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if (munmap(base_, limit_ - base_) != 0) {
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result = false;
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}
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file_offset_ += limit_ - base_;
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base_ = nullptr;
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limit_ = nullptr;
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last_sync_ = nullptr;
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dst_ = nullptr;
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// Increase the amount we map the next time, but capped at 1MB
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if (map_size_ < (1<<20)) {
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map_size_ *= 2;
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}
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}
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return result;
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}
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Status MapNewRegion() {
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#ifdef ROCKSDB_FALLOCATE_PRESENT
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assert(base_ == nullptr);
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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// we can't fallocate with FALLOC_FL_KEEP_SIZE here
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int alloc_status = fallocate(fd_, 0, file_offset_, map_size_);
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if (alloc_status != 0) {
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// fallback to posix_fallocate
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alloc_status = posix_fallocate(fd_, file_offset_, map_size_);
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}
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if (alloc_status != 0) {
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return Status::IOError("Error allocating space to file : " + filename_ +
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"Error : " + strerror(alloc_status));
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}
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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void* ptr = mmap(nullptr, map_size_, PROT_READ | PROT_WRITE, MAP_SHARED,
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fd_, file_offset_);
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if (ptr == MAP_FAILED) {
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return Status::IOError("MMap failed on " + filename_);
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}
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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base_ = reinterpret_cast<char*>(ptr);
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limit_ = base_ + map_size_;
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dst_ = base_;
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last_sync_ = base_;
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return Status::OK();
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#else
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return Status::NotSupported("This platform doesn't support fallocate()");
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#endif
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}
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public:
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PosixMmapFile(const std::string& fname, int fd, size_t page_size,
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const EnvOptions& options)
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: filename_(fname),
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fd_(fd),
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page_size_(page_size),
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map_size_(Roundup(65536, page_size)),
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base_(nullptr),
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limit_(nullptr),
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dst_(nullptr),
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last_sync_(nullptr),
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file_offset_(0),
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pending_sync_(false) {
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#ifdef ROCKSDB_FALLOCATE_PRESENT
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fallocate_with_keep_size_ = options.fallocate_with_keep_size;
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#endif
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assert((page_size & (page_size - 1)) == 0);
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assert(options.use_mmap_writes);
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}
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~PosixMmapFile() {
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if (fd_ >= 0) {
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PosixMmapFile::Close();
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}
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}
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virtual Status Append(const Slice& data) {
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const char* src = data.data();
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size_t left = data.size();
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TEST_KILL_RANDOM(rocksdb_kill_odds * REDUCE_ODDS);
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PrepareWrite(GetFileSize(), left);
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while (left > 0) {
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assert(base_ <= dst_);
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assert(dst_ <= limit_);
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size_t avail = limit_ - dst_;
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if (avail == 0) {
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if (UnmapCurrentRegion()) {
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Status s = MapNewRegion();
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if (!s.ok()) {
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return s;
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}
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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}
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}
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size_t n = (left <= avail) ? left : avail;
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memcpy(dst_, src, n);
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dst_ += n;
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src += n;
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left -= n;
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}
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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return Status::OK();
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}
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virtual Status Close() {
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Status s;
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size_t unused = limit_ - dst_;
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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if (!UnmapCurrentRegion()) {
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s = IOError(filename_, errno);
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} else if (unused > 0) {
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// Trim the extra space at the end of the file
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if (ftruncate(fd_, file_offset_ - unused) < 0) {
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s = IOError(filename_, errno);
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}
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}
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TEST_KILL_RANDOM(rocksdb_kill_odds);
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|
|
if (close(fd_) < 0) {
|
|
if (s.ok()) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
}
|
|
|
|
fd_ = -1;
|
|
base_ = nullptr;
|
|
limit_ = nullptr;
|
|
return s;
|
|
}
|
|
|
|
virtual Status Flush() {
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Sync() {
|
|
Status s;
|
|
|
|
if (pending_sync_) {
|
|
// Some unmapped data was not synced
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
pending_sync_ = false;
|
|
if (fdatasync(fd_) < 0) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds * REDUCE_ODDS);
|
|
}
|
|
|
|
if (dst_ > last_sync_) {
|
|
// Find the beginnings of the pages that contain the first and last
|
|
// bytes to be synced.
|
|
size_t p1 = TruncateToPageBoundary(last_sync_ - base_);
|
|
size_t p2 = TruncateToPageBoundary(dst_ - base_ - 1);
|
|
last_sync_ = dst_;
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
if (msync(base_ + p1, p2 - p1 + page_size_, MS_SYNC) < 0) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* Flush data as well as metadata to stable storage.
|
|
*/
|
|
virtual Status Fsync() {
|
|
if (pending_sync_) {
|
|
// Some unmapped data was not synced
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
pending_sync_ = false;
|
|
if (fsync(fd_) < 0) {
|
|
return IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
}
|
|
// This invocation to Sync will not issue the call to
|
|
// fdatasync because pending_sync_ has already been cleared.
|
|
return Sync();
|
|
}
|
|
|
|
/**
|
|
* Get the size of valid data in the file. This will not match the
|
|
* size that is returned from the filesystem because we use mmap
|
|
* to extend file by map_size every time.
|
|
*/
|
|
virtual uint64_t GetFileSize() {
|
|
size_t used = dst_ - base_;
|
|
return file_offset_ + used;
|
|
}
|
|
|
|
virtual Status InvalidateCache(size_t offset, size_t length) {
|
|
#ifndef OS_LINUX
|
|
return Status::OK();
|
|
#else
|
|
// free OS pages
|
|
int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);
|
|
if (ret == 0) {
|
|
return Status::OK();
|
|
}
|
|
return IOError(filename_, errno);
|
|
#endif
|
|
}
|
|
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
virtual Status Allocate(off_t offset, off_t len) {
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
int alloc_status = fallocate(
|
|
fd_, fallocate_with_keep_size_ ? FALLOC_FL_KEEP_SIZE : 0, offset, len);
|
|
if (alloc_status == 0) {
|
|
return Status::OK();
|
|
} else {
|
|
return IOError(filename_, errno);
|
|
}
|
|
}
|
|
#endif
|
|
};
|
|
|
|
// Use posix write to write data to a file.
|
|
class PosixWritableFile : public WritableFile {
|
|
private:
|
|
const std::string filename_;
|
|
int fd_;
|
|
size_t cursize_; // current size of cached data in buf_
|
|
size_t capacity_; // max size of buf_
|
|
unique_ptr<char[]> buf_; // a buffer to cache writes
|
|
uint64_t filesize_;
|
|
bool pending_sync_;
|
|
bool pending_fsync_;
|
|
uint64_t last_sync_size_;
|
|
uint64_t bytes_per_sync_;
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
bool fallocate_with_keep_size_;
|
|
#endif
|
|
|
|
public:
|
|
PosixWritableFile(const std::string& fname, int fd, size_t capacity,
|
|
const EnvOptions& options)
|
|
: filename_(fname),
|
|
fd_(fd),
|
|
cursize_(0),
|
|
capacity_(capacity),
|
|
buf_(new char[capacity]),
|
|
filesize_(0),
|
|
pending_sync_(false),
|
|
pending_fsync_(false),
|
|
last_sync_size_(0),
|
|
bytes_per_sync_(options.bytes_per_sync) {
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
fallocate_with_keep_size_ = options.fallocate_with_keep_size;
|
|
#endif
|
|
assert(!options.use_mmap_writes);
|
|
}
|
|
|
|
~PosixWritableFile() {
|
|
if (fd_ >= 0) {
|
|
PosixWritableFile::Close();
|
|
}
|
|
}
|
|
|
|
virtual Status Append(const Slice& data) {
|
|
const char* src = data.data();
|
|
size_t left = data.size();
|
|
Status s;
|
|
pending_sync_ = true;
|
|
pending_fsync_ = true;
|
|
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds * REDUCE_ODDS2);
|
|
|
|
PrepareWrite(GetFileSize(), left);
|
|
// if there is no space in the cache, then flush
|
|
if (cursize_ + left > capacity_) {
|
|
s = Flush();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
// Increase the buffer size, but capped at 1MB
|
|
if (capacity_ < (1<<20)) {
|
|
capacity_ *= 2;
|
|
buf_.reset(new char[capacity_]);
|
|
}
|
|
assert(cursize_ == 0);
|
|
}
|
|
|
|
// if the write fits into the cache, then write to cache
|
|
// otherwise do a write() syscall to write to OS buffers.
|
|
if (cursize_ + left <= capacity_) {
|
|
memcpy(buf_.get()+cursize_, src, left);
|
|
cursize_ += left;
|
|
} else {
|
|
while (left != 0) {
|
|
ssize_t done = write(fd_, src, left);
|
|
if (done < 0) {
|
|
if (errno == EINTR) {
|
|
continue;
|
|
}
|
|
return IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
|
|
left -= done;
|
|
src += done;
|
|
}
|
|
}
|
|
filesize_ += data.size();
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Close() {
|
|
Status s;
|
|
s = Flush(); // flush cache to OS
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
|
|
size_t block_size;
|
|
size_t last_allocated_block;
|
|
GetPreallocationStatus(&block_size, &last_allocated_block);
|
|
if (last_allocated_block > 0) {
|
|
// trim the extra space preallocated at the end of the file
|
|
int dummy __attribute__((unused));
|
|
dummy = ftruncate(fd_, filesize_); // ignore errors
|
|
}
|
|
|
|
if (close(fd_) < 0) {
|
|
if (s.ok()) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
}
|
|
fd_ = -1;
|
|
return s;
|
|
}
|
|
|
|
// write out the cached data to the OS cache
|
|
virtual Status Flush() {
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds * REDUCE_ODDS2);
|
|
size_t left = cursize_;
|
|
char* src = buf_.get();
|
|
while (left != 0) {
|
|
ssize_t done = write(fd_, src, left);
|
|
if (done < 0) {
|
|
if (errno == EINTR) {
|
|
continue;
|
|
}
|
|
return IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds * REDUCE_ODDS2);
|
|
left -= done;
|
|
src += done;
|
|
}
|
|
cursize_ = 0;
|
|
|
|
// sync OS cache to disk for every bytes_per_sync_
|
|
// TODO: give log file and sst file different options (log
|
|
// files could be potentially cached in OS for their whole
|
|
// life time, thus we might not want to flush at all).
|
|
if (bytes_per_sync_ &&
|
|
filesize_ - last_sync_size_ >= bytes_per_sync_) {
|
|
RangeSync(last_sync_size_, filesize_ - last_sync_size_);
|
|
last_sync_size_ = filesize_;
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Sync() {
|
|
Status s = Flush();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
if (pending_sync_ && fdatasync(fd_) < 0) {
|
|
return IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
pending_sync_ = false;
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Fsync() {
|
|
Status s = Flush();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
if (pending_fsync_ && fsync(fd_) < 0) {
|
|
return IOError(filename_, errno);
|
|
}
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
pending_fsync_ = false;
|
|
pending_sync_ = false;
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual uint64_t GetFileSize() {
|
|
return filesize_;
|
|
}
|
|
|
|
virtual Status InvalidateCache(size_t offset, size_t length) {
|
|
#ifndef OS_LINUX
|
|
return Status::OK();
|
|
#else
|
|
// free OS pages
|
|
int ret = Fadvise(fd_, offset, length, POSIX_FADV_DONTNEED);
|
|
if (ret == 0) {
|
|
return Status::OK();
|
|
}
|
|
return IOError(filename_, errno);
|
|
#endif
|
|
}
|
|
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
virtual Status Allocate(off_t offset, off_t len) {
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
int alloc_status = fallocate(
|
|
fd_, fallocate_with_keep_size_ ? FALLOC_FL_KEEP_SIZE : 0, offset, len);
|
|
if (alloc_status == 0) {
|
|
return Status::OK();
|
|
} else {
|
|
return IOError(filename_, errno);
|
|
}
|
|
}
|
|
|
|
virtual Status RangeSync(off64_t offset, off64_t nbytes) {
|
|
if (sync_file_range(fd_, offset, nbytes, SYNC_FILE_RANGE_WRITE) == 0) {
|
|
return Status::OK();
|
|
} else {
|
|
return IOError(filename_, errno);
|
|
}
|
|
}
|
|
virtual size_t GetUniqueId(char* id, size_t max_size) const {
|
|
return GetUniqueIdFromFile(fd_, id, max_size);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
class PosixRandomRWFile : public RandomRWFile {
|
|
private:
|
|
const std::string filename_;
|
|
int fd_;
|
|
bool pending_sync_;
|
|
bool pending_fsync_;
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
bool fallocate_with_keep_size_;
|
|
#endif
|
|
|
|
public:
|
|
PosixRandomRWFile(const std::string& fname, int fd, const EnvOptions& options)
|
|
: filename_(fname),
|
|
fd_(fd),
|
|
pending_sync_(false),
|
|
pending_fsync_(false) {
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
fallocate_with_keep_size_ = options.fallocate_with_keep_size;
|
|
#endif
|
|
assert(!options.use_mmap_writes && !options.use_mmap_reads);
|
|
}
|
|
|
|
~PosixRandomRWFile() {
|
|
if (fd_ >= 0) {
|
|
Close();
|
|
}
|
|
}
|
|
|
|
virtual Status Write(uint64_t offset, const Slice& data) {
|
|
const char* src = data.data();
|
|
size_t left = data.size();
|
|
Status s;
|
|
pending_sync_ = true;
|
|
pending_fsync_ = true;
|
|
|
|
while (left != 0) {
|
|
ssize_t done = pwrite(fd_, src, left, offset);
|
|
if (done < 0) {
|
|
if (errno == EINTR) {
|
|
continue;
|
|
}
|
|
return IOError(filename_, errno);
|
|
}
|
|
|
|
left -= done;
|
|
src += done;
|
|
offset += done;
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Read(uint64_t offset, size_t n, Slice* result,
|
|
char* scratch) const {
|
|
Status s;
|
|
ssize_t r = pread(fd_, scratch, n, static_cast<off_t>(offset));
|
|
*result = Slice(scratch, (r < 0) ? 0 : r);
|
|
if (r < 0) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
virtual Status Close() {
|
|
Status s = Status::OK();
|
|
if (fd_ >= 0 && close(fd_) < 0) {
|
|
s = IOError(filename_, errno);
|
|
}
|
|
fd_ = -1;
|
|
return s;
|
|
}
|
|
|
|
virtual Status Sync() {
|
|
if (pending_sync_ && fdatasync(fd_) < 0) {
|
|
return IOError(filename_, errno);
|
|
}
|
|
pending_sync_ = false;
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status Fsync() {
|
|
if (pending_fsync_ && fsync(fd_) < 0) {
|
|
return IOError(filename_, errno);
|
|
}
|
|
pending_fsync_ = false;
|
|
pending_sync_ = false;
|
|
return Status::OK();
|
|
}
|
|
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
virtual Status Allocate(off_t offset, off_t len) {
|
|
TEST_KILL_RANDOM(rocksdb_kill_odds);
|
|
int alloc_status = fallocate(
|
|
fd_, fallocate_with_keep_size_ ? FALLOC_FL_KEEP_SIZE : 0, offset, len);
|
|
if (alloc_status == 0) {
|
|
return Status::OK();
|
|
} else {
|
|
return IOError(filename_, errno);
|
|
}
|
|
}
|
|
#endif
|
|
};
|
|
|
|
class PosixDirectory : public Directory {
|
|
public:
|
|
explicit PosixDirectory(int fd) : fd_(fd) {}
|
|
~PosixDirectory() {
|
|
close(fd_);
|
|
}
|
|
|
|
virtual Status Fsync() {
|
|
if (fsync(fd_) == -1) {
|
|
return IOError("directory", errno);
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
private:
|
|
int fd_;
|
|
};
|
|
|
|
static int LockOrUnlock(const std::string& fname, int fd, bool lock) {
|
|
mutex_lockedFiles.Lock();
|
|
if (lock) {
|
|
// If it already exists in the lockedFiles set, then it is already locked,
|
|
// and fail this lock attempt. Otherwise, insert it into lockedFiles.
|
|
// This check is needed because fcntl() does not detect lock conflict
|
|
// if the fcntl is issued by the same thread that earlier acquired
|
|
// this lock.
|
|
if (lockedFiles.insert(fname).second == false) {
|
|
mutex_lockedFiles.Unlock();
|
|
errno = ENOLCK;
|
|
return -1;
|
|
}
|
|
} else {
|
|
// If we are unlocking, then verify that we had locked it earlier,
|
|
// it should already exist in lockedFiles. Remove it from lockedFiles.
|
|
if (lockedFiles.erase(fname) != 1) {
|
|
mutex_lockedFiles.Unlock();
|
|
errno = ENOLCK;
|
|
return -1;
|
|
}
|
|
}
|
|
errno = 0;
|
|
struct flock f;
|
|
memset(&f, 0, sizeof(f));
|
|
f.l_type = (lock ? F_WRLCK : F_UNLCK);
|
|
f.l_whence = SEEK_SET;
|
|
f.l_start = 0;
|
|
f.l_len = 0; // Lock/unlock entire file
|
|
int value = fcntl(fd, F_SETLK, &f);
|
|
if (value == -1 && lock) {
|
|
// if there is an error in locking, then remove the pathname from lockedfiles
|
|
lockedFiles.erase(fname);
|
|
}
|
|
mutex_lockedFiles.Unlock();
|
|
return value;
|
|
}
|
|
|
|
class PosixFileLock : public FileLock {
|
|
public:
|
|
int fd_;
|
|
std::string filename;
|
|
};
|
|
|
|
|
|
namespace {
|
|
void PthreadCall(const char* label, int result) {
|
|
if (result != 0) {
|
|
fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
class PosixEnv : public Env {
|
|
public:
|
|
PosixEnv();
|
|
|
|
virtual ~PosixEnv(){
|
|
for (const auto tid : threads_to_join_) {
|
|
pthread_join(tid, nullptr);
|
|
}
|
|
}
|
|
|
|
void SetFD_CLOEXEC(int fd, const EnvOptions* options) {
|
|
if ((options == nullptr || options->set_fd_cloexec) && fd > 0) {
|
|
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
|
|
}
|
|
}
|
|
|
|
virtual Status NewSequentialFile(const std::string& fname,
|
|
unique_ptr<SequentialFile>* result,
|
|
const EnvOptions& options) {
|
|
result->reset();
|
|
FILE* f = nullptr;
|
|
do {
|
|
f = fopen(fname.c_str(), "r");
|
|
} while (f == nullptr && errno == EINTR);
|
|
if (f == nullptr) {
|
|
*result = nullptr;
|
|
return IOError(fname, errno);
|
|
} else {
|
|
int fd = fileno(f);
|
|
SetFD_CLOEXEC(fd, &options);
|
|
result->reset(new PosixSequentialFile(fname, f, options));
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
virtual Status NewRandomAccessFile(const std::string& fname,
|
|
unique_ptr<RandomAccessFile>* result,
|
|
const EnvOptions& options) {
|
|
result->reset();
|
|
Status s;
|
|
int fd = open(fname.c_str(), O_RDONLY);
|
|
SetFD_CLOEXEC(fd, &options);
|
|
if (fd < 0) {
|
|
s = IOError(fname, errno);
|
|
} else if (options.use_mmap_reads && sizeof(void*) >= 8) {
|
|
// Use of mmap for random reads has been removed because it
|
|
// kills performance when storage is fast.
|
|
// Use mmap when virtual address-space is plentiful.
|
|
uint64_t size;
|
|
s = GetFileSize(fname, &size);
|
|
if (s.ok()) {
|
|
void* base = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd, 0);
|
|
if (base != MAP_FAILED) {
|
|
result->reset(new PosixMmapReadableFile(fd, fname, base,
|
|
size, options));
|
|
} else {
|
|
s = IOError(fname, errno);
|
|
}
|
|
}
|
|
close(fd);
|
|
} else {
|
|
result->reset(new PosixRandomAccessFile(fname, fd, options));
|
|
}
|
|
return s;
|
|
}
|
|
|
|
virtual Status NewWritableFile(const std::string& fname,
|
|
unique_ptr<WritableFile>* result,
|
|
const EnvOptions& options) {
|
|
result->reset();
|
|
Status s;
|
|
int fd = -1;
|
|
do {
|
|
fd = open(fname.c_str(), O_CREAT | O_RDWR | O_TRUNC, 0644);
|
|
} while (fd < 0 && errno == EINTR);
|
|
if (fd < 0) {
|
|
s = IOError(fname, errno);
|
|
} else {
|
|
SetFD_CLOEXEC(fd, &options);
|
|
if (options.use_mmap_writes) {
|
|
if (!checkedDiskForMmap_) {
|
|
// this will be executed once in the program's lifetime.
|
|
// do not use mmapWrite on non ext-3/xfs/tmpfs systems.
|
|
if (!SupportsFastAllocate(fname)) {
|
|
forceMmapOff = true;
|
|
}
|
|
checkedDiskForMmap_ = true;
|
|
}
|
|
}
|
|
if (options.use_mmap_writes && !forceMmapOff) {
|
|
result->reset(new PosixMmapFile(fname, fd, page_size_, options));
|
|
} else {
|
|
// disable mmap writes
|
|
EnvOptions no_mmap_writes_options = options;
|
|
no_mmap_writes_options.use_mmap_writes = false;
|
|
|
|
result->reset(
|
|
new PosixWritableFile(fname, fd, 65536, no_mmap_writes_options)
|
|
);
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
virtual Status NewRandomRWFile(const std::string& fname,
|
|
unique_ptr<RandomRWFile>* result,
|
|
const EnvOptions& options) {
|
|
result->reset();
|
|
// no support for mmap yet
|
|
if (options.use_mmap_writes || options.use_mmap_reads) {
|
|
return Status::NotSupported("No support for mmap read/write yet");
|
|
}
|
|
Status s;
|
|
const int fd = open(fname.c_str(), O_CREAT | O_RDWR, 0644);
|
|
if (fd < 0) {
|
|
s = IOError(fname, errno);
|
|
} else {
|
|
SetFD_CLOEXEC(fd, &options);
|
|
result->reset(new PosixRandomRWFile(fname, fd, options));
|
|
}
|
|
return s;
|
|
}
|
|
|
|
virtual Status NewDirectory(const std::string& name,
|
|
unique_ptr<Directory>* result) {
|
|
result->reset();
|
|
const int fd = open(name.c_str(), 0);
|
|
if (fd < 0) {
|
|
return IOError(name, errno);
|
|
} else {
|
|
result->reset(new PosixDirectory(fd));
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual bool FileExists(const std::string& fname) {
|
|
return access(fname.c_str(), F_OK) == 0;
|
|
}
|
|
|
|
virtual Status GetChildren(const std::string& dir,
|
|
std::vector<std::string>* result) {
|
|
result->clear();
|
|
DIR* d = opendir(dir.c_str());
|
|
if (d == nullptr) {
|
|
return IOError(dir, errno);
|
|
}
|
|
struct dirent* entry;
|
|
while ((entry = readdir(d)) != nullptr) {
|
|
result->push_back(entry->d_name);
|
|
}
|
|
closedir(d);
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status DeleteFile(const std::string& fname) {
|
|
Status result;
|
|
if (unlink(fname.c_str()) != 0) {
|
|
result = IOError(fname, errno);
|
|
}
|
|
return result;
|
|
};
|
|
|
|
virtual Status CreateDir(const std::string& name) {
|
|
Status result;
|
|
if (mkdir(name.c_str(), 0755) != 0) {
|
|
result = IOError(name, errno);
|
|
}
|
|
return result;
|
|
};
|
|
|
|
virtual Status CreateDirIfMissing(const std::string& name) {
|
|
Status result;
|
|
if (mkdir(name.c_str(), 0755) != 0) {
|
|
if (errno != EEXIST) {
|
|
result = IOError(name, errno);
|
|
} else if (!DirExists(name)) { // Check that name is actually a
|
|
// directory.
|
|
// Message is taken from mkdir
|
|
result = Status::IOError("`"+name+"' exists but is not a directory");
|
|
}
|
|
}
|
|
return result;
|
|
};
|
|
|
|
virtual Status DeleteDir(const std::string& name) {
|
|
Status result;
|
|
if (rmdir(name.c_str()) != 0) {
|
|
result = IOError(name, errno);
|
|
}
|
|
return result;
|
|
};
|
|
|
|
virtual Status GetFileSize(const std::string& fname, uint64_t* size) {
|
|
Status s;
|
|
struct stat sbuf;
|
|
if (stat(fname.c_str(), &sbuf) != 0) {
|
|
*size = 0;
|
|
s = IOError(fname, errno);
|
|
} else {
|
|
*size = sbuf.st_size;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
virtual Status GetFileModificationTime(const std::string& fname,
|
|
uint64_t* file_mtime) {
|
|
struct stat s;
|
|
if (stat(fname.c_str(), &s) !=0) {
|
|
return IOError(fname, errno);
|
|
}
|
|
*file_mtime = static_cast<uint64_t>(s.st_mtime);
|
|
return Status::OK();
|
|
}
|
|
virtual Status RenameFile(const std::string& src, const std::string& target) {
|
|
Status result;
|
|
if (rename(src.c_str(), target.c_str()) != 0) {
|
|
result = IOError(src, errno);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual Status LockFile(const std::string& fname, FileLock** lock) {
|
|
*lock = nullptr;
|
|
Status result;
|
|
int fd = open(fname.c_str(), O_RDWR | O_CREAT, 0644);
|
|
if (fd < 0) {
|
|
result = IOError(fname, errno);
|
|
} else if (LockOrUnlock(fname, fd, true) == -1) {
|
|
result = IOError("lock " + fname, errno);
|
|
close(fd);
|
|
} else {
|
|
SetFD_CLOEXEC(fd, nullptr);
|
|
PosixFileLock* my_lock = new PosixFileLock;
|
|
my_lock->fd_ = fd;
|
|
my_lock->filename = fname;
|
|
*lock = my_lock;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual Status UnlockFile(FileLock* lock) {
|
|
PosixFileLock* my_lock = reinterpret_cast<PosixFileLock*>(lock);
|
|
Status result;
|
|
if (LockOrUnlock(my_lock->filename, my_lock->fd_, false) == -1) {
|
|
result = IOError("unlock", errno);
|
|
}
|
|
close(my_lock->fd_);
|
|
delete my_lock;
|
|
return result;
|
|
}
|
|
|
|
virtual void Schedule(void (*function)(void*), void* arg, Priority pri = LOW);
|
|
|
|
virtual void StartThread(void (*function)(void* arg), void* arg);
|
|
|
|
virtual void WaitForJoin();
|
|
|
|
virtual unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override;
|
|
|
|
virtual Status GetTestDirectory(std::string* result) {
|
|
const char* env = getenv("TEST_TMPDIR");
|
|
if (env && env[0] != '\0') {
|
|
*result = env;
|
|
} else {
|
|
char buf[100];
|
|
snprintf(buf, sizeof(buf), "/tmp/rocksdbtest-%d", int(geteuid()));
|
|
*result = buf;
|
|
}
|
|
// Directory may already exist
|
|
CreateDir(*result);
|
|
return Status::OK();
|
|
}
|
|
|
|
static uint64_t gettid() {
|
|
pthread_t tid = pthread_self();
|
|
uint64_t thread_id = 0;
|
|
memcpy(&thread_id, &tid, std::min(sizeof(thread_id), sizeof(tid)));
|
|
return thread_id;
|
|
}
|
|
|
|
virtual Status NewLogger(const std::string& fname,
|
|
shared_ptr<Logger>* result) {
|
|
FILE* f = fopen(fname.c_str(), "w");
|
|
if (f == nullptr) {
|
|
result->reset();
|
|
return IOError(fname, errno);
|
|
} else {
|
|
int fd = fileno(f);
|
|
SetFD_CLOEXEC(fd, nullptr);
|
|
result->reset(new PosixLogger(f, &PosixEnv::gettid, this));
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
virtual uint64_t NowMicros() {
|
|
struct timeval tv;
|
|
// TODO(kailiu) MAC DON'T HAVE THIS
|
|
gettimeofday(&tv, nullptr);
|
|
return static_cast<uint64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
|
|
}
|
|
|
|
virtual uint64_t NowNanos() {
|
|
#ifdef OS_LINUX
|
|
struct timespec ts;
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
|
|
#elif __MACH__
|
|
clock_serv_t cclock;
|
|
mach_timespec_t ts;
|
|
host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
|
|
clock_get_time(cclock, &ts);
|
|
mach_port_deallocate(mach_task_self(), cclock);
|
|
#endif
|
|
return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
|
|
}
|
|
|
|
virtual void SleepForMicroseconds(int micros) {
|
|
usleep(micros);
|
|
}
|
|
|
|
virtual Status GetHostName(char* name, uint64_t len) {
|
|
int ret = gethostname(name, len);
|
|
if (ret < 0) {
|
|
if (errno == EFAULT || errno == EINVAL)
|
|
return Status::InvalidArgument(strerror(errno));
|
|
else
|
|
return IOError("GetHostName", errno);
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status GetCurrentTime(int64_t* unix_time) {
|
|
time_t ret = time(nullptr);
|
|
if (ret == (time_t) -1) {
|
|
return IOError("GetCurrentTime", errno);
|
|
}
|
|
*unix_time = (int64_t) ret;
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual Status GetAbsolutePath(const std::string& db_path,
|
|
std::string* output_path) {
|
|
if (db_path.find('/') == 0) {
|
|
*output_path = db_path;
|
|
return Status::OK();
|
|
}
|
|
|
|
char the_path[256];
|
|
char* ret = getcwd(the_path, 256);
|
|
if (ret == nullptr) {
|
|
return Status::IOError(strerror(errno));
|
|
}
|
|
|
|
*output_path = ret;
|
|
return Status::OK();
|
|
}
|
|
|
|
// Allow increasing the number of worker threads.
|
|
virtual void SetBackgroundThreads(int num, Priority pri) {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
thread_pools_[pri].SetBackgroundThreads(num);
|
|
}
|
|
|
|
virtual std::string TimeToString(uint64_t secondsSince1970) {
|
|
const time_t seconds = (time_t)secondsSince1970;
|
|
struct tm t;
|
|
int maxsize = 64;
|
|
std::string dummy;
|
|
dummy.reserve(maxsize);
|
|
dummy.resize(maxsize);
|
|
char* p = &dummy[0];
|
|
localtime_r(&seconds, &t);
|
|
snprintf(p, maxsize,
|
|
"%04d/%02d/%02d-%02d:%02d:%02d ",
|
|
t.tm_year + 1900,
|
|
t.tm_mon + 1,
|
|
t.tm_mday,
|
|
t.tm_hour,
|
|
t.tm_min,
|
|
t.tm_sec);
|
|
return dummy;
|
|
}
|
|
|
|
EnvOptions OptimizeForLogWrite(const EnvOptions& env_options) const {
|
|
EnvOptions optimized = env_options;
|
|
optimized.use_mmap_writes = false;
|
|
// TODO(icanadi) it's faster if fallocate_with_keep_size is false, but it
|
|
// breaks TransactionLogIteratorStallAtLastRecord unit test. Fix the unit
|
|
// test and make this false
|
|
optimized.fallocate_with_keep_size = true;
|
|
return optimized;
|
|
}
|
|
|
|
EnvOptions OptimizeForManifestWrite(const EnvOptions& env_options) const {
|
|
EnvOptions optimized = env_options;
|
|
optimized.use_mmap_writes = false;
|
|
optimized.fallocate_with_keep_size = true;
|
|
return optimized;
|
|
}
|
|
|
|
private:
|
|
bool checkedDiskForMmap_;
|
|
bool forceMmapOff; // do we override Env options?
|
|
|
|
|
|
// Returns true iff the named directory exists and is a directory.
|
|
virtual bool DirExists(const std::string& dname) {
|
|
struct stat statbuf;
|
|
if (stat(dname.c_str(), &statbuf) == 0) {
|
|
return S_ISDIR(statbuf.st_mode);
|
|
}
|
|
return false; // stat() failed return false
|
|
}
|
|
|
|
bool SupportsFastAllocate(const std::string& path) {
|
|
#ifdef ROCKSDB_FALLOCATE_PRESENT
|
|
struct statfs s;
|
|
if (statfs(path.c_str(), &s)){
|
|
return false;
|
|
}
|
|
switch (s.f_type) {
|
|
case EXT4_SUPER_MAGIC:
|
|
return true;
|
|
case XFS_SUPER_MAGIC:
|
|
return true;
|
|
case TMPFS_MAGIC:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
size_t page_size_;
|
|
|
|
|
|
class ThreadPool {
|
|
public:
|
|
ThreadPool()
|
|
: total_threads_limit_(1),
|
|
bgthreads_(0),
|
|
queue_(),
|
|
queue_len_(0),
|
|
exit_all_threads_(false) {
|
|
PthreadCall("mutex_init", pthread_mutex_init(&mu_, nullptr));
|
|
PthreadCall("cvar_init", pthread_cond_init(&bgsignal_, nullptr));
|
|
}
|
|
|
|
~ThreadPool() {
|
|
PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
assert(!exit_all_threads_);
|
|
exit_all_threads_ = true;
|
|
PthreadCall("signalall", pthread_cond_broadcast(&bgsignal_));
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
for (const auto tid : bgthreads_) {
|
|
pthread_join(tid, nullptr);
|
|
}
|
|
}
|
|
|
|
// Return true if there is at least one thread needs to terminate.
|
|
bool HasExcessiveThread() {
|
|
return static_cast<int>(bgthreads_.size()) > total_threads_limit_;
|
|
}
|
|
|
|
// Return true iff the current thread is the excessive thread to terminate.
|
|
// Always terminate the running thread that is added last, even if there are
|
|
// more than one thread to terminate.
|
|
bool IsLastExcessiveThread(size_t thread_id) {
|
|
return HasExcessiveThread() && thread_id == bgthreads_.size() - 1;
|
|
}
|
|
|
|
// Is one of the threads to terminate.
|
|
bool IsExcessiveThread(size_t thread_id) {
|
|
return static_cast<int>(thread_id) >= total_threads_limit_;
|
|
}
|
|
|
|
void BGThread(size_t thread_id) {
|
|
while (true) {
|
|
// Wait until there is an item that is ready to run
|
|
PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
// Stop waiting if the thread needs to do work or needs to terminate.
|
|
while (!exit_all_threads_ && !IsLastExcessiveThread(thread_id) &&
|
|
(queue_.empty() || IsExcessiveThread(thread_id))) {
|
|
PthreadCall("wait", pthread_cond_wait(&bgsignal_, &mu_));
|
|
}
|
|
if (exit_all_threads_) { // mechanism to let BG threads exit safely
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
break;
|
|
}
|
|
if (IsLastExcessiveThread(thread_id)) {
|
|
// Current thread is the last generated one and is excessive.
|
|
// We always terminate excessive thread in the reverse order of
|
|
// generation time.
|
|
auto terminating_thread = bgthreads_.back();
|
|
pthread_detach(terminating_thread);
|
|
bgthreads_.pop_back();
|
|
if (HasExcessiveThread()) {
|
|
// There is still at least more excessive thread to terminate.
|
|
WakeUpAllThreads();
|
|
}
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
// TODO(sdong): temp logging. Need to help debugging. Remove it when
|
|
// the feature is proved to be stable.
|
|
fprintf(stdout, "Bg thread %zu terminates %llx\n", thread_id,
|
|
static_cast<long long unsigned int>(terminating_thread));
|
|
break;
|
|
}
|
|
void (*function)(void*) = queue_.front().function;
|
|
void* arg = queue_.front().arg;
|
|
queue_.pop_front();
|
|
queue_len_.store(queue_.size(), std::memory_order_relaxed);
|
|
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
(*function)(arg);
|
|
}
|
|
}
|
|
|
|
// Helper struct for passing arguments when creating threads.
|
|
struct BGThreadMetadata {
|
|
ThreadPool* thread_pool_;
|
|
size_t thread_id_; // Thread count in the thread.
|
|
explicit BGThreadMetadata(ThreadPool* thread_pool, size_t thread_id)
|
|
: thread_pool_(thread_pool), thread_id_(thread_id) {}
|
|
};
|
|
|
|
static void* BGThreadWrapper(void* arg) {
|
|
BGThreadMetadata* meta = reinterpret_cast<BGThreadMetadata*>(arg);
|
|
size_t thread_id = meta->thread_id_;
|
|
ThreadPool* tp = meta->thread_pool_;
|
|
delete meta;
|
|
tp->BGThread(thread_id);
|
|
return nullptr;
|
|
}
|
|
|
|
void WakeUpAllThreads() {
|
|
PthreadCall("signalall", pthread_cond_broadcast(&bgsignal_));
|
|
}
|
|
|
|
void SetBackgroundThreads(int num) {
|
|
PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
if (exit_all_threads_) {
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
return;
|
|
}
|
|
if (num != total_threads_limit_) {
|
|
total_threads_limit_ = num;
|
|
WakeUpAllThreads();
|
|
StartBGThreads();
|
|
}
|
|
assert(total_threads_limit_ > 0);
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
}
|
|
|
|
void StartBGThreads() {
|
|
// Start background thread if necessary
|
|
while ((int)bgthreads_.size() < total_threads_limit_) {
|
|
pthread_t t;
|
|
PthreadCall(
|
|
"create thread",
|
|
pthread_create(&t, nullptr, &ThreadPool::BGThreadWrapper,
|
|
new BGThreadMetadata(this, bgthreads_.size())));
|
|
|
|
// Set the thread name to aid debugging
|
|
#if defined(_GNU_SOURCE) && defined(__GLIBC_PREREQ)
|
|
#if __GLIBC_PREREQ(2, 12)
|
|
char name_buf[16];
|
|
snprintf(name_buf, sizeof name_buf, "rocksdb:bg%zu", bgthreads_.size());
|
|
name_buf[sizeof name_buf - 1] = '\0';
|
|
pthread_setname_np(t, name_buf);
|
|
#endif
|
|
#endif
|
|
|
|
bgthreads_.push_back(t);
|
|
}
|
|
}
|
|
|
|
void Schedule(void (*function)(void*), void* arg) {
|
|
PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
|
|
if (exit_all_threads_) {
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
return;
|
|
}
|
|
|
|
StartBGThreads();
|
|
|
|
// Add to priority queue
|
|
queue_.push_back(BGItem());
|
|
queue_.back().function = function;
|
|
queue_.back().arg = arg;
|
|
queue_len_.store(queue_.size(), std::memory_order_relaxed);
|
|
|
|
if (!HasExcessiveThread()) {
|
|
// Wake up at least one waiting thread.
|
|
PthreadCall("signal", pthread_cond_signal(&bgsignal_));
|
|
} else {
|
|
// Need to wake up all threads to make sure the one woken
|
|
// up is not the one to terminate.
|
|
WakeUpAllThreads();
|
|
}
|
|
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
}
|
|
|
|
unsigned int GetQueueLen() const {
|
|
return queue_len_.load(std::memory_order_relaxed);
|
|
}
|
|
|
|
private:
|
|
// Entry per Schedule() call
|
|
struct BGItem { void* arg; void (*function)(void*); };
|
|
typedef std::deque<BGItem> BGQueue;
|
|
|
|
pthread_mutex_t mu_;
|
|
pthread_cond_t bgsignal_;
|
|
int total_threads_limit_;
|
|
std::vector<pthread_t> bgthreads_;
|
|
BGQueue queue_;
|
|
std::atomic_uint queue_len_; // Queue length. Used for stats reporting
|
|
bool exit_all_threads_;
|
|
};
|
|
|
|
std::vector<ThreadPool> thread_pools_;
|
|
|
|
pthread_mutex_t mu_;
|
|
std::vector<pthread_t> threads_to_join_;
|
|
|
|
};
|
|
|
|
PosixEnv::PosixEnv() : checkedDiskForMmap_(false),
|
|
forceMmapOff(false),
|
|
page_size_(getpagesize()),
|
|
thread_pools_(Priority::TOTAL) {
|
|
PthreadCall("mutex_init", pthread_mutex_init(&mu_, nullptr));
|
|
}
|
|
|
|
void PosixEnv::Schedule(void (*function)(void*), void* arg, Priority pri) {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
thread_pools_[pri].Schedule(function, arg);
|
|
}
|
|
|
|
unsigned int PosixEnv::GetThreadPoolQueueLen(Priority pri) const {
|
|
assert(pri >= Priority::LOW && pri <= Priority::HIGH);
|
|
return thread_pools_[pri].GetQueueLen();
|
|
}
|
|
|
|
namespace {
|
|
struct StartThreadState {
|
|
void (*user_function)(void*);
|
|
void* arg;
|
|
};
|
|
}
|
|
static void* StartThreadWrapper(void* arg) {
|
|
StartThreadState* state = reinterpret_cast<StartThreadState*>(arg);
|
|
state->user_function(state->arg);
|
|
delete state;
|
|
return nullptr;
|
|
}
|
|
|
|
void PosixEnv::StartThread(void (*function)(void* arg), void* arg) {
|
|
pthread_t t;
|
|
StartThreadState* state = new StartThreadState;
|
|
state->user_function = function;
|
|
state->arg = arg;
|
|
PthreadCall("start thread",
|
|
pthread_create(&t, nullptr, &StartThreadWrapper, state));
|
|
PthreadCall("lock", pthread_mutex_lock(&mu_));
|
|
threads_to_join_.push_back(t);
|
|
PthreadCall("unlock", pthread_mutex_unlock(&mu_));
|
|
}
|
|
|
|
void PosixEnv::WaitForJoin() {
|
|
for (const auto tid : threads_to_join_) {
|
|
pthread_join(tid, nullptr);
|
|
}
|
|
threads_to_join_.clear();
|
|
}
|
|
|
|
} // namespace
|
|
|
|
std::string Env::GenerateUniqueId() {
|
|
std::string uuid_file = "/proc/sys/kernel/random/uuid";
|
|
if (FileExists(uuid_file)) {
|
|
std::string uuid;
|
|
Status s = ReadFileToString(this, uuid_file, &uuid);
|
|
if (s.ok()) {
|
|
return uuid;
|
|
}
|
|
}
|
|
// Could not read uuid_file - generate uuid using "nanos-random"
|
|
Random64 r(time(nullptr));
|
|
uint64_t random_uuid_portion =
|
|
r.Uniform(std::numeric_limits<uint64_t>::max());
|
|
uint64_t nanos_uuid_portion = NowNanos();
|
|
char uuid2[200];
|
|
snprintf(uuid2,
|
|
200,
|
|
"%lx-%lx",
|
|
(unsigned long)nanos_uuid_portion,
|
|
(unsigned long)random_uuid_portion);
|
|
return uuid2;
|
|
}
|
|
|
|
Env* Env::Default() {
|
|
static PosixEnv default_env;
|
|
return &default_env;
|
|
}
|
|
|
|
} // namespace rocksdb
|