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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // WARNING: You should probably be using Thread (thread.h) instead. Thread is | 5 // WARNING: You should probably be using Thread (thread.h) instead. Thread is |
| 6 // Chrome's message-loop based Thread abstraction, and if you are a | 6 // Chrome's message-loop based Thread abstraction, and if you are a |
| 7 // thread running in the browser, there will likely be assumptions | 7 // thread running in the browser, there will likely be assumptions |
| 8 // that your thread will have an associated message loop. | 8 // that your thread will have an associated message loop. |
| 9 // | 9 // |
| 10 // This is a simple thread interface that backs to a native operating system | 10 // This is a simple thread interface that backs to a native operating system |
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| 38 // // or Start again. | 38 // // or Start again. |
| 39 | 39 |
| 40 #ifndef BASE_THREADING_SIMPLE_THREAD_H_ | 40 #ifndef BASE_THREADING_SIMPLE_THREAD_H_ |
| 41 #define BASE_THREADING_SIMPLE_THREAD_H_ | 41 #define BASE_THREADING_SIMPLE_THREAD_H_ |
| 42 #pragma once | 42 #pragma once |
| 43 | 43 |
| 44 #include <string> | 44 #include <string> |
| 45 #include <queue> | 45 #include <queue> |
| 46 #include <vector> | 46 #include <vector> |
| 47 | 47 |
| 48 #include "base/base_api.h" |
| 48 #include "base/basictypes.h" | 49 #include "base/basictypes.h" |
| 49 #include "base/threading/platform_thread.h" | 50 #include "base/threading/platform_thread.h" |
| 50 #include "base/synchronization/lock.h" | 51 #include "base/synchronization/lock.h" |
| 51 #include "base/synchronization/waitable_event.h" | 52 #include "base/synchronization/waitable_event.h" |
| 52 | 53 |
| 53 namespace base { | 54 namespace base { |
| 54 | 55 |
| 55 // This is the base SimpleThread. You can derive from it and implement the | 56 // This is the base SimpleThread. You can derive from it and implement the |
| 56 // virtual Run method, or you can use the DelegateSimpleThread interface. | 57 // virtual Run method, or you can use the DelegateSimpleThread interface. |
| 57 class SimpleThread : public PlatformThread::Delegate { | 58 class BASE_API SimpleThread : public PlatformThread::Delegate { |
| 58 public: | 59 public: |
| 59 class Options { | 60 class BASE_API Options { |
| 60 public: | 61 public: |
| 61 Options() : stack_size_(0) { } | 62 Options() : stack_size_(0) { } |
| 62 ~Options() { } | 63 ~Options() { } |
| 63 | 64 |
| 64 // We use the standard compiler-supplied copy constructor. | 65 // We use the standard compiler-supplied copy constructor. |
| 65 | 66 |
| 66 // A custom stack size, or 0 for the system default. | 67 // A custom stack size, or 0 for the system default. |
| 67 void set_stack_size(size_t size) { stack_size_ = size; } | 68 void set_stack_size(size_t size) { stack_size_ = size; } |
| 68 size_t stack_size() const { return stack_size_; } | 69 size_t stack_size() const { return stack_size_; } |
| 69 private: | 70 private: |
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| 106 private: | 107 private: |
| 107 const std::string name_prefix_; | 108 const std::string name_prefix_; |
| 108 std::string name_; | 109 std::string name_; |
| 109 const Options options_; | 110 const Options options_; |
| 110 PlatformThreadHandle thread_; // PlatformThread handle, invalid after Join! | 111 PlatformThreadHandle thread_; // PlatformThread handle, invalid after Join! |
| 111 WaitableEvent event_; // Signaled if Start() was ever called. | 112 WaitableEvent event_; // Signaled if Start() was ever called. |
| 112 PlatformThreadId tid_; // The backing thread's id. | 113 PlatformThreadId tid_; // The backing thread's id. |
| 113 bool joined_; // True if Join has been called. | 114 bool joined_; // True if Join has been called. |
| 114 }; | 115 }; |
| 115 | 116 |
| 116 class DelegateSimpleThread : public SimpleThread { | 117 class BASE_API DelegateSimpleThread : public SimpleThread { |
| 117 public: | 118 public: |
| 118 class Delegate { | 119 class BASE_API Delegate { |
| 119 public: | 120 public: |
| 120 Delegate() { } | 121 Delegate() { } |
| 121 virtual ~Delegate() { } | 122 virtual ~Delegate() { } |
| 122 virtual void Run() = 0; | 123 virtual void Run() = 0; |
| 123 }; | 124 }; |
| 124 | 125 |
| 125 DelegateSimpleThread(Delegate* delegate, | 126 DelegateSimpleThread(Delegate* delegate, |
| 126 const std::string& name_prefix); | 127 const std::string& name_prefix); |
| 127 DelegateSimpleThread(Delegate* delegate, | 128 DelegateSimpleThread(Delegate* delegate, |
| 128 const std::string& name_prefix, | 129 const std::string& name_prefix, |
| 129 const Options& options); | 130 const Options& options); |
| 130 | 131 |
| 131 virtual ~DelegateSimpleThread(); | 132 virtual ~DelegateSimpleThread(); |
| 132 virtual void Run(); | 133 virtual void Run(); |
| 133 private: | 134 private: |
| 134 Delegate* delegate_; | 135 Delegate* delegate_; |
| 135 }; | 136 }; |
| 136 | 137 |
| 137 // DelegateSimpleThreadPool allows you to start up a fixed number of threads, | 138 // DelegateSimpleThreadPool allows you to start up a fixed number of threads, |
| 138 // and then add jobs which will be dispatched to the threads. This is | 139 // and then add jobs which will be dispatched to the threads. This is |
| 139 // convenient when you have a lot of small work that you want done | 140 // convenient when you have a lot of small work that you want done |
| 140 // multi-threaded, but don't want to spawn a thread for each small bit of work. | 141 // multi-threaded, but don't want to spawn a thread for each small bit of work. |
| 141 // | 142 // |
| 142 // You just call AddWork() to add a delegate to the list of work to be done. | 143 // You just call AddWork() to add a delegate to the list of work to be done. |
| 143 // JoinAll() will make sure that all outstanding work is processed, and wait | 144 // JoinAll() will make sure that all outstanding work is processed, and wait |
| 144 // for everything to finish. You can reuse a pool, so you can call Start() | 145 // for everything to finish. You can reuse a pool, so you can call Start() |
| 145 // again after you've called JoinAll(). | 146 // again after you've called JoinAll(). |
| 146 class DelegateSimpleThreadPool : public DelegateSimpleThread::Delegate { | 147 class BASE_API DelegateSimpleThreadPool |
| 148 : public DelegateSimpleThread::Delegate { |
| 147 public: | 149 public: |
| 148 typedef DelegateSimpleThread::Delegate Delegate; | 150 typedef DelegateSimpleThread::Delegate Delegate; |
| 149 | 151 |
| 150 DelegateSimpleThreadPool(const std::string& name_prefix, int num_threads); | 152 DelegateSimpleThreadPool(const std::string& name_prefix, int num_threads); |
| 151 virtual ~DelegateSimpleThreadPool(); | 153 virtual ~DelegateSimpleThreadPool(); |
| 152 | 154 |
| 153 // Start up all of the underlying threads, and start processing work if we | 155 // Start up all of the underlying threads, and start processing work if we |
| 154 // have any. | 156 // have any. |
| 155 void Start(); | 157 void Start(); |
| 156 | 158 |
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| 173 int num_threads_; | 175 int num_threads_; |
| 174 std::vector<DelegateSimpleThread*> threads_; | 176 std::vector<DelegateSimpleThread*> threads_; |
| 175 std::queue<Delegate*> delegates_; | 177 std::queue<Delegate*> delegates_; |
| 176 base::Lock lock_; // Locks delegates_ | 178 base::Lock lock_; // Locks delegates_ |
| 177 WaitableEvent dry_; // Not signaled when there is no work to do. | 179 WaitableEvent dry_; // Not signaled when there is no work to do. |
| 178 }; | 180 }; |
| 179 | 181 |
| 180 } // namespace base | 182 } // namespace base |
| 181 | 183 |
| 182 #endif // BASE_THREADING_SIMPLE_THREAD_H_ | 184 #endif // BASE_THREADING_SIMPLE_THREAD_H_ |
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