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comparison: ipc/chromium/src/base/simple_thread.cc
ipc/chromium/src/base/simple_thread.cc
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| -1:000000000000 | 0:d5c15f902849 |
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| 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/waitable_event.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "base/platform_thread.h" | |
| 10 #include "base/string_util.h" | |
| 11 | |
| 12 namespace base { | |
| 13 | |
| 14 void SimpleThread::Start() { | |
| 15 DCHECK(!HasBeenStarted()) << "Tried to Start a thread multiple times."; | |
| 16 bool success = PlatformThread::Create(options_.stack_size(), this, &thread_); | |
| 17 CHECK(success); | |
| 18 event_.Wait(); // Wait for the thread to complete initialization. | |
| 19 } | |
| 20 | |
| 21 void SimpleThread::Join() { | |
| 22 DCHECK(HasBeenStarted()) << "Tried to Join a never-started thread."; | |
| 23 DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times."; | |
| 24 PlatformThread::Join(thread_); | |
| 25 joined_ = true; | |
| 26 } | |
| 27 | |
| 28 void SimpleThread::ThreadMain() { | |
| 29 tid_ = PlatformThread::CurrentId(); | |
| 30 // Construct our full name of the form "name_prefix_/TID". | |
| 31 name_.push_back('/'); | |
| 32 name_.append(IntToString(tid_)); | |
| 33 PlatformThread::SetName(name_.c_str()); | |
| 34 | |
| 35 // We've initialized our new thread, signal that we're done to Start(). | |
| 36 event_.Signal(); | |
| 37 | |
| 38 Run(); | |
| 39 } | |
| 40 | |
| 41 SimpleThread::~SimpleThread() { | |
| 42 DCHECK(HasBeenStarted()) << "SimpleThread was never started."; | |
| 43 DCHECK(HasBeenJoined()) << "SimpleThread destroyed without being Join()ed."; | |
| 44 } | |
| 45 | |
| 46 void DelegateSimpleThread::Run() { | |
| 47 DCHECK(delegate_) << "Tried to call Run without a delegate (called twice?)"; | |
| 48 delegate_->Run(); | |
| 49 delegate_ = NULL; | |
| 50 } | |
| 51 | |
| 52 DelegateSimpleThreadPool::~DelegateSimpleThreadPool() { | |
| 53 DCHECK(threads_.empty()); | |
| 54 DCHECK(delegates_.empty()); | |
| 55 DCHECK(!dry_.IsSignaled()); | |
| 56 } | |
| 57 | |
| 58 void DelegateSimpleThreadPool::Start() { | |
| 59 DCHECK(threads_.empty()) << "Start() called with outstanding threads."; | |
| 60 for (int i = 0; i < num_threads_; ++i) { | |
| 61 DelegateSimpleThread* thread = new DelegateSimpleThread(this, name_prefix_); | |
| 62 thread->Start(); | |
| 63 threads_.push_back(thread); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 void DelegateSimpleThreadPool::JoinAll() { | |
| 68 DCHECK(!threads_.empty()) << "JoinAll() called with no outstanding threads."; | |
| 69 | |
| 70 // Tell all our threads to quit their worker loop. | |
| 71 AddWork(NULL, num_threads_); | |
| 72 | |
| 73 // Join and destroy all the worker threads. | |
| 74 for (int i = 0; i < num_threads_; ++i) { | |
| 75 threads_[i]->Join(); | |
| 76 delete threads_[i]; | |
| 77 } | |
| 78 threads_.clear(); | |
| 79 DCHECK(delegates_.empty()); | |
| 80 } | |
| 81 | |
| 82 void DelegateSimpleThreadPool::AddWork(Delegate* delegate, int repeat_count) { | |
| 83 AutoLock locked(lock_); | |
| 84 for (int i = 0; i < repeat_count; ++i) | |
| 85 delegates_.push(delegate); | |
| 86 // If we were empty, signal that we have work now. | |
| 87 if (!dry_.IsSignaled()) | |
| 88 dry_.Signal(); | |
| 89 } | |
| 90 | |
| 91 void DelegateSimpleThreadPool::Run() { | |
| 92 Delegate* work; | |
| 93 | |
| 94 while (true) { | |
| 95 dry_.Wait(); | |
| 96 { | |
| 97 AutoLock locked(lock_); | |
| 98 if (!dry_.IsSignaled()) | |
| 99 continue; | |
| 100 | |
| 101 DCHECK(!delegates_.empty()); | |
| 102 work = delegates_.front(); | |
| 103 delegates_.pop(); | |
| 104 | |
| 105 // Signal to any other threads that we're currently out of work. | |
| 106 if (delegates_.empty()) | |
| 107 dry_.Reset(); | |
| 108 } | |
| 109 | |
| 110 // A NULL delegate pointer signals us to quit. | |
| 111 if (!work) | |
| 112 break; | |
| 113 | |
| 114 work->Run(); | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 } // namespace base |
