Summary: as title Test Plan: asan_check will post results later Reviewers: haobo, igor, dhruba, sdong Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16257
233 lines
6.4 KiB
C++
233 lines
6.4 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 "util/thread_local.h"
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#include "util/mutexlock.h"
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#include "port/likely.h"
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namespace rocksdb {
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std::unique_ptr<ThreadLocalPtr::StaticMeta> ThreadLocalPtr::StaticMeta::inst_;
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port::Mutex ThreadLocalPtr::StaticMeta::mutex_;
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#if !defined(OS_MACOSX)
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__thread ThreadLocalPtr::ThreadData* ThreadLocalPtr::StaticMeta::tls_ = nullptr;
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#endif
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ThreadLocalPtr::StaticMeta* ThreadLocalPtr::StaticMeta::Instance() {
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if (UNLIKELY(inst_ == nullptr)) {
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MutexLock l(&mutex_);
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if (inst_ == nullptr) {
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inst_.reset(new StaticMeta());
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}
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}
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return inst_.get();
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}
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void ThreadLocalPtr::StaticMeta::OnThreadExit(void* ptr) {
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auto* tls = static_cast<ThreadData*>(ptr);
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assert(tls != nullptr);
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auto* inst = Instance();
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pthread_setspecific(inst->pthread_key_, nullptr);
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MutexLock l(&mutex_);
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inst->RemoveThreadData(tls);
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// Unref stored pointers of current thread from all instances
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uint32_t id = 0;
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for (auto& e : tls->entries) {
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void* raw = e.ptr.load(std::memory_order_relaxed);
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if (raw != nullptr) {
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auto unref = inst->GetHandler(id);
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if (unref != nullptr) {
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unref(raw);
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}
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}
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++id;
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}
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// Delete thread local structure no matter if it is Mac platform
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delete tls;
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}
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ThreadLocalPtr::StaticMeta::StaticMeta() : next_instance_id_(0) {
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if (pthread_key_create(&pthread_key_, &OnThreadExit) != 0) {
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throw std::runtime_error("pthread_key_create failed");
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}
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head_.next = &head_;
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head_.prev = &head_;
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}
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void ThreadLocalPtr::StaticMeta::AddThreadData(ThreadLocalPtr::ThreadData* d) {
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mutex_.AssertHeld();
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d->next = &head_;
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d->prev = head_.prev;
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head_.prev->next = d;
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head_.prev = d;
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}
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void ThreadLocalPtr::StaticMeta::RemoveThreadData(
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ThreadLocalPtr::ThreadData* d) {
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mutex_.AssertHeld();
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d->next->prev = d->prev;
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d->prev->next = d->next;
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d->next = d->prev = d;
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}
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ThreadLocalPtr::ThreadData* ThreadLocalPtr::StaticMeta::GetThreadLocal() {
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#if defined(OS_MACOSX)
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// Make this local variable name look like a member variable so that we
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// can share all the code below
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ThreadData* tls_ =
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static_cast<ThreadData*>(pthread_getspecific(Instance()->pthread_key_));
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#endif
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if (UNLIKELY(tls_ == nullptr)) {
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auto* inst = Instance();
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tls_ = new ThreadData();
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{
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// Register it in the global chain, needs to be done before thread exit
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// handler registration
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MutexLock l(&mutex_);
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inst->AddThreadData(tls_);
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}
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// Even it is not OS_MACOSX, need to register value for pthread_key_ so that
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// its exit handler will be triggered.
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if (pthread_setspecific(inst->pthread_key_, tls_) != 0) {
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{
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MutexLock l(&mutex_);
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inst->RemoveThreadData(tls_);
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}
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delete tls_;
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throw std::runtime_error("pthread_setspecific failed");
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}
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}
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return tls_;
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}
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void* ThreadLocalPtr::StaticMeta::Get(uint32_t id) const {
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auto* tls = GetThreadLocal();
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if (UNLIKELY(id >= tls->entries.size())) {
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return nullptr;
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}
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return tls->entries[id].ptr.load(std::memory_order_relaxed);
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}
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void ThreadLocalPtr::StaticMeta::Reset(uint32_t id, void* ptr) {
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auto* tls = GetThreadLocal();
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if (UNLIKELY(id >= tls->entries.size())) {
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// Need mutex to protect entries access within ReclaimId
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MutexLock l(&mutex_);
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tls->entries.resize(id + 1);
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}
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tls->entries[id].ptr.store(ptr, std::memory_order_relaxed);
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}
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void* ThreadLocalPtr::StaticMeta::Swap(uint32_t id, void* ptr) {
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auto* tls = GetThreadLocal();
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if (UNLIKELY(id >= tls->entries.size())) {
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// Need mutex to protect entries access within ReclaimId
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MutexLock l(&mutex_);
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tls->entries.resize(id + 1);
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}
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return tls->entries[id].ptr.exchange(ptr, std::memory_order_relaxed);
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}
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void ThreadLocalPtr::StaticMeta::Scrape(uint32_t id, autovector<void*>* ptrs) {
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MutexLock l(&mutex_);
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for (ThreadData* t = head_.next; t != &head_; t = t->next) {
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if (id < t->entries.size()) {
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void* ptr =
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t->entries[id].ptr.exchange(nullptr, std::memory_order_relaxed);
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if (ptr != nullptr) {
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ptrs->push_back(ptr);
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}
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}
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}
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}
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void ThreadLocalPtr::StaticMeta::SetHandler(uint32_t id, UnrefHandler handler) {
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MutexLock l(&mutex_);
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handler_map_[id] = handler;
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}
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UnrefHandler ThreadLocalPtr::StaticMeta::GetHandler(uint32_t id) {
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mutex_.AssertHeld();
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auto iter = handler_map_.find(id);
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if (iter == handler_map_.end()) {
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return nullptr;
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}
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return iter->second;
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}
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uint32_t ThreadLocalPtr::StaticMeta::GetId() {
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MutexLock l(&mutex_);
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if (free_instance_ids_.empty()) {
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return next_instance_id_++;
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}
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uint32_t id = free_instance_ids_.back();
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free_instance_ids_.pop_back();
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return id;
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}
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uint32_t ThreadLocalPtr::StaticMeta::PeekId() const {
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MutexLock l(&mutex_);
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if (!free_instance_ids_.empty()) {
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return free_instance_ids_.back();
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}
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return next_instance_id_;
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}
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void ThreadLocalPtr::StaticMeta::ReclaimId(uint32_t id) {
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// This id is not used, go through all thread local data and release
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// corresponding value
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MutexLock l(&mutex_);
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auto unref = GetHandler(id);
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for (ThreadData* t = head_.next; t != &head_; t = t->next) {
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if (id < t->entries.size()) {
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void* ptr =
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t->entries[id].ptr.exchange(nullptr, std::memory_order_relaxed);
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if (ptr != nullptr && unref != nullptr) {
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unref(ptr);
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}
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}
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}
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handler_map_[id] = nullptr;
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free_instance_ids_.push_back(id);
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}
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ThreadLocalPtr::ThreadLocalPtr(UnrefHandler handler)
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: id_(StaticMeta::Instance()->GetId()) {
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if (handler != nullptr) {
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StaticMeta::Instance()->SetHandler(id_, handler);
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}
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}
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ThreadLocalPtr::~ThreadLocalPtr() {
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StaticMeta::Instance()->ReclaimId(id_);
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}
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void* ThreadLocalPtr::Get() const {
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return StaticMeta::Instance()->Get(id_);
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}
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void ThreadLocalPtr::Reset(void* ptr) {
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StaticMeta::Instance()->Reset(id_, ptr);
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}
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void* ThreadLocalPtr::Swap(void* ptr) {
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return StaticMeta::Instance()->Swap(id_, ptr);
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}
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void ThreadLocalPtr::Scrape(autovector<void*>* ptrs) {
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StaticMeta::Instance()->Scrape(id_, ptrs);
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}
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} // namespace rocksdb
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