| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/simple_thread.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/platform_thread.h" | |
| 9 #include "base/string_number_conversions.h" | |
| 10 | |
| 11 namespace base { | |
| 12 | |
| 13 void SimpleThread::Start() { | |
| 14 DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times."; | |
| 15 bool success = PlatformThread::Create(options_.stack_size(), this, &thread_); | |
| 16 CHECK(success); | |
| 17 event_.Wait(); // Wait for the thread to complete initialization. | |
| 18 } | |
| 19 | |
| 20 void SimpleThread::Join() { | |
| 21 DCHECK(HasBeenStarted()) << "Tried to Join a never-started thread."; | |
| 22 DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times."; | |
| 23 PlatformThread::Join(thread_); | |
| 24 joined_ = true; | |
| 25 } | |
| 26 | |
| 27 void SimpleThread::ThreadMain() { | |
| 28 tid_ = PlatformThread::CurrentId(); | |
| 29 // Construct our full name of the form "name_prefix_/TID". | |
| 30 name_.push_back('/'); | |
| 31 name_.append(IntToString(tid_)); | |
| 32 PlatformThread::SetName(name_.c_str()); | |
| 33 | |
| 34 // We've initialized our new thread, signal that we're done to Start(). | |
| 35 event_.Signal(); | |
| 36 | |
| 37 Run(); | |
| 38 } | |
| 39 | |
| 40 SimpleThread::SimpleThread(const std::string& name_prefix) | |
| 41 : name_prefix_(name_prefix), name_(name_prefix), | |
| 42 thread_(), event_(true, false), tid_(0), joined_(false) { | |
| 43 } | |
| 44 | |
| 45 SimpleThread::SimpleThread(const std::string& name_prefix, | |
| 46 const Options& options) | |
| 47 : name_prefix_(name_prefix), name_(name_prefix), options_(options), | |
| 48 thread_(), event_(true, false), tid_(0), joined_(false) { | |
| 49 } | |
| 50 | |
| 51 SimpleThread::~SimpleThread() { | |
| 52 DCHECK(HasBeenStarted()) << "SimpleThread was never started."; | |
| 53 DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed."; | |
| 54 } | |
| 55 | |
| 56 DelegateSimpleThread::DelegateSimpleThread(Delegate* delegate, | |
| 57 const std::string& name_prefix) | |
| 58 : SimpleThread(name_prefix), | |
| 59 delegate_(delegate) { | |
| 60 } | |
| 61 | |
| 62 DelegateSimpleThread::DelegateSimpleThread(Delegate* delegate, | |
| 63 const std::string& name_prefix, | |
| 64 const Options& options) | |
| 65 : SimpleThread(name_prefix, options), | |
| 66 delegate_(delegate) { | |
| 67 } | |
| 68 | |
| 69 DelegateSimpleThread::~DelegateSimpleThread() { | |
| 70 } | |
| 71 | |
| 72 void DelegateSimpleThread::Run() { | |
| 73 DCHECK(delegate_) << "Tried to call Run without a delegate (called twice?)"; | |
| 74 delegate_->Run(); | |
| 75 delegate_ = NULL; | |
| 76 } | |
| 77 | |
| 78 DelegateSimpleThreadPool::DelegateSimpleThreadPool( | |
| 79 const std::string& name_prefix, | |
| 80 int num_threads) | |
| 81 : name_prefix_(name_prefix), | |
| 82 num_threads_(num_threads), | |
| 83 dry_(true, false) { | |
| 84 } | |
| 85 | |
| 86 DelegateSimpleThreadPool::~DelegateSimpleThreadPool() { | |
| 87 DCHECK(threads_.empty()); | |
| 88 DCHECK(delegates_.empty()); | |
| 89 DCHECK(!dry_.IsSignaled()); | |
| 90 } | |
| 91 | |
| 92 void DelegateSimpleThreadPool::Start() { | |
| 93 DCHECK(threads_.empty()) << "Start() called with outstanding threads."; | |
| 94 for (int i = 0; i < num_threads_; ++i) { | |
| 95 DelegateSimpleThread* thread = new DelegateSimpleThread(this, name_prefix_); | |
| 96 thread->Start(); | |
| 97 threads_.push_back(thread); | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 void DelegateSimpleThreadPool::JoinAll() { | |
| 102 DCHECK(!threads_.empty()) << "JoinAll() called with no outstanding threads."; | |
| 103 | |
| 104 // Tell all our threads to quit their worker loop. | |
| 105 AddWork(NULL, num_threads_); | |
| 106 | |
| 107 // Join and destroy all the worker threads. | |
| 108 for (int i = 0; i < num_threads_; ++i) { | |
| 109 threads_[i]->Join(); | |
| 110 delete threads_[i]; | |
| 111 } | |
| 112 threads_.clear(); | |
| 113 DCHECK(delegates_.empty()); | |
| 114 } | |
| 115 | |
| 116 void DelegateSimpleThreadPool::AddWork(Delegate* delegate, int repeat_count) { | |
| 117 AutoLock locked(lock_); | |
| 118 for (int i = 0; i < repeat_count; ++i) | |
| 119 delegates_.push(delegate); | |
| 120 // If we were empty, signal that we have work now. | |
| 121 if (!dry_.IsSignaled()) | |
| 122 dry_.Signal(); | |
| 123 } | |
| 124 | |
| 125 void DelegateSimpleThreadPool::Run() { | |
| 126 Delegate* work = NULL; | |
| 127 | |
| 128 while (true) { | |
| 129 dry_.Wait(); | |
| 130 { | |
| 131 AutoLock locked(lock_); | |
| 132 if (!dry_.IsSignaled()) | |
| 133 continue; | |
| 134 | |
| 135 DCHECK(!delegates_.empty()); | |
| 136 work = delegates_.front(); | |
| 137 delegates_.pop(); | |
| 138 | |
| 139 // Signal to any other threads that we're currently out of work. | |
| 140 if (delegates_.empty()) | |
| 141 dry_.Reset(); | |
| 142 } | |
| 143 | |
| 144 // A NULL delegate pointer signals us to quit. | |
| 145 if (!work) | |
| 146 break; | |
| 147 | |
| 148 work->Run(); | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 } // namespace base | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 6079009:
Move some misc thread-related stuff from base to base/thread and into the bas... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/