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| 1 // Copyright (c) 2010 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/threading/simple_thread.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/strings/string_number_conversions.h" | |
| 9 #include "base/threading/platform_thread.h" | |
| 10 #include "base/threading/thread_restrictions.h" | |
| 11 | |
| 12 namespace base { | |
| 13 | |
| 14 SimpleThread::SimpleThread(const std::string& name_prefix) | |
| 15 : name_prefix_(name_prefix), name_(name_prefix), | |
| 16 thread_(), event_(true, false), tid_(0), joined_(false) { | |
| 17 } | |
| 18 | |
| 19 SimpleThread::SimpleThread(const std::string& name_prefix, | |
| 20 const Options& options) | |
| 21 : name_prefix_(name_prefix), name_(name_prefix), options_(options), | |
| 22 thread_(), event_(true, false), tid_(0), joined_(false) { | |
| 23 } | |
| 24 | |
| 25 SimpleThread::~SimpleThread() { | |
| 26 DCHECK(HasBeenStarted()) << "SimpleThread was never started."; | |
| 27 DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed."; | |
| 28 } | |
| 29 | |
| 30 void SimpleThread::Start() { | |
| 31 DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times."; | |
| 32 bool success; | |
| 33 if (options_.priority() == ThreadPriority::NORMAL) { | |
| 34 success = PlatformThread::Create(options_.stack_size(), this, &thread_); | |
| 35 } else { | |
| 36 success = PlatformThread::CreateWithPriority(options_.stack_size(), this, | |
| 37 &thread_, options_.priority()); | |
| 38 } | |
| 39 DCHECK(success); | |
| 40 base::ThreadRestrictions::ScopedAllowWait allow_wait; | |
| 41 event_.Wait(); // Wait for the thread to complete initialization. | |
| 42 } | |
| 43 | |
| 44 void SimpleThread::Join() { | |
| 45 DCHECK(HasBeenStarted()) << "Tried to Join a never-started thread."; | |
| 46 DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times."; | |
| 47 PlatformThread::Join(thread_); | |
| 48 joined_ = true; | |
| 49 } | |
| 50 | |
| 51 bool SimpleThread::HasBeenStarted() { | |
| 52 base::ThreadRestrictions::ScopedAllowWait allow_wait; | |
| 53 return event_.IsSignaled(); | |
| 54 } | |
| 55 | |
| 56 void SimpleThread::ThreadMain() { | |
| 57 tid_ = PlatformThread::CurrentId(); | |
| 58 // Construct our full name of the form "name_prefix_/TID". | |
| 59 name_.push_back('/'); | |
| 60 name_.append(IntToString(tid_)); | |
| 61 PlatformThread::SetName(name_); | |
| 62 | |
| 63 // We've initialized our new thread, signal that we're done to Start(). | |
| 64 event_.Signal(); | |
| 65 | |
| 66 Run(); | |
| 67 } | |
| 68 | |
| 69 DelegateSimpleThread::DelegateSimpleThread(Delegate* delegate, | |
| 70 const std::string& name_prefix) | |
| 71 : SimpleThread(name_prefix), | |
| 72 delegate_(delegate) { | |
| 73 } | |
| 74 | |
| 75 DelegateSimpleThread::DelegateSimpleThread(Delegate* delegate, | |
| 76 const std::string& name_prefix, | |
| 77 const Options& options) | |
| 78 : SimpleThread(name_prefix, options), | |
| 79 delegate_(delegate) { | |
| 80 } | |
| 81 | |
| 82 DelegateSimpleThread::~DelegateSimpleThread() { | |
| 83 } | |
| 84 | |
| 85 void DelegateSimpleThread::Run() { | |
| 86 DCHECK(delegate_) << "Tried to call Run without a delegate (called twice?)"; | |
| 87 delegate_->Run(); | |
| 88 delegate_ = NULL; | |
| 89 } | |
| 90 | |
| 91 DelegateSimpleThreadPool::DelegateSimpleThreadPool( | |
| 92 const std::string& name_prefix, | |
| 93 int num_threads) | |
| 94 : name_prefix_(name_prefix), | |
| 95 num_threads_(num_threads), | |
| 96 dry_(true, false) { | |
| 97 } | |
| 98 | |
| 99 DelegateSimpleThreadPool::~DelegateSimpleThreadPool() { | |
| 100 DCHECK(threads_.empty()); | |
| 101 DCHECK(delegates_.empty()); | |
| 102 DCHECK(!dry_.IsSignaled()); | |
| 103 } | |
| 104 | |
| 105 void DelegateSimpleThreadPool::Start() { | |
| 106 DCHECK(threads_.empty()) << "Start() called with outstanding threads."; | |
| 107 for (int i = 0; i < num_threads_; ++i) { | |
| 108 DelegateSimpleThread* thread = new DelegateSimpleThread(this, name_prefix_); | |
| 109 thread->Start(); | |
| 110 threads_.push_back(thread); | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 void DelegateSimpleThreadPool::JoinAll() { | |
| 115 DCHECK(!threads_.empty()) << "JoinAll() called with no outstanding threads."; | |
| 116 | |
| 117 // Tell all our threads to quit their worker loop. | |
| 118 AddWork(NULL, num_threads_); | |
| 119 | |
| 120 // Join and destroy all the worker threads. | |
| 121 for (int i = 0; i < num_threads_; ++i) { | |
| 122 threads_[i]->Join(); | |
| 123 delete threads_[i]; | |
| 124 } | |
| 125 threads_.clear(); | |
| 126 DCHECK(delegates_.empty()); | |
| 127 } | |
| 128 | |
| 129 void DelegateSimpleThreadPool::AddWork(Delegate* delegate, int repeat_count) { | |
| 130 AutoLock locked(lock_); | |
| 131 for (int i = 0; i < repeat_count; ++i) | |
| 132 delegates_.push(delegate); | |
| 133 // If we were empty, signal that we have work now. | |
| 134 if (!dry_.IsSignaled()) | |
| 135 dry_.Signal(); | |
| 136 } | |
| 137 | |
| 138 void DelegateSimpleThreadPool::Run() { | |
| 139 Delegate* work = NULL; | |
| 140 | |
| 141 while (true) { | |
| 142 dry_.Wait(); | |
| 143 { | |
| 144 AutoLock locked(lock_); | |
| 145 if (!dry_.IsSignaled()) | |
| 146 continue; | |
| 147 | |
| 148 DCHECK(!delegates_.empty()); | |
| 149 work = delegates_.front(); | |
| 150 delegates_.pop(); | |
| 151 | |
| 152 // Signal to any other threads that we're currently out of work. | |
| 153 if (delegates_.empty()) | |
| 154 dry_.Reset(); | |
| 155 } | |
| 156 | |
| 157 // A NULL delegate pointer signals us to quit. | |
| 158 if (!work) | |
| 159 break; | |
| 160 | |
| 161 work->Run(); | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 } // namespace base | |
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