a58d48de79
Summary: Implement ReadWrite locks for leveldb. These will be helpful to implement a read-modify-write operation (e.g. atomic increments). Test Plan: does not modify any existing code Reviewers: heyongqiang Reviewed By: heyongqiang CC: MarkCallaghan Differential Revision: https://reviews.facebook.net/D5787
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// 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 "port/port_posix.h"
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#include <cstdlib>
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#include <stdio.h>
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#include <string.h>
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#include "util/logging.h"
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namespace leveldb {
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namespace port {
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static void PthreadCall(const char* label, int result) {
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if (result != 0) {
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fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
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abort();
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}
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}
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Mutex::Mutex() { PthreadCall("init mutex", pthread_mutex_init(&mu_, NULL)); }
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Mutex::~Mutex() { PthreadCall("destroy mutex", pthread_mutex_destroy(&mu_)); }
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void Mutex::Lock() { PthreadCall("lock", pthread_mutex_lock(&mu_)); }
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void Mutex::Unlock() { PthreadCall("unlock", pthread_mutex_unlock(&mu_)); }
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CondVar::CondVar(Mutex* mu)
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: mu_(mu) {
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PthreadCall("init cv", pthread_cond_init(&cv_, NULL));
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}
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CondVar::~CondVar() { PthreadCall("destroy cv", pthread_cond_destroy(&cv_)); }
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void CondVar::Wait() {
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PthreadCall("wait", pthread_cond_wait(&cv_, &mu_->mu_));
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}
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void CondVar::Signal() {
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PthreadCall("signal", pthread_cond_signal(&cv_));
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}
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void CondVar::SignalAll() {
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PthreadCall("broadcast", pthread_cond_broadcast(&cv_));
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}
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RWMutex::RWMutex() { PthreadCall("init mutex", pthread_rwlock_init(&mu_, NULL)); }
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RWMutex::~RWMutex() { PthreadCall("destroy mutex", pthread_rwlock_destroy(&mu_)); }
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void RWMutex::ReadLock() { PthreadCall("read lock", pthread_rwlock_rdlock(&mu_)); }
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void RWMutex::WriteLock() { PthreadCall("write lock", pthread_rwlock_wrlock(&mu_)); }
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void RWMutex::Unlock() { PthreadCall("unlock", pthread_rwlock_unlock(&mu_)); }
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void InitOnce(OnceType* once, void (*initializer)()) {
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PthreadCall("once", pthread_once(once, initializer));
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}
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} // namespace port
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} // namespace leveldb
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