Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
      12             : #define WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
      13             : 
      14             : #include <list>
      15             : #include <memory>
      16             : #include <queue>
      17             : 
      18             : #include "webrtc/base/criticalsection.h"
      19             : #include "webrtc/base/platform_thread.h"
      20             : #include "webrtc/base/thread_checker.h"
      21             : #include "webrtc/modules/utility/include/process_thread.h"
      22             : #include "webrtc/system_wrappers/include/event_wrapper.h"
      23             : #include "webrtc/typedefs.h"
      24             : 
      25             : namespace webrtc {
      26             : 
      27             : class ProcessThreadImpl : public ProcessThread {
      28             :  public:
      29             :   explicit ProcessThreadImpl(const char* thread_name);
      30             :   ~ProcessThreadImpl() override;
      31             : 
      32             :   void Start() override;
      33             :   void Stop() override;
      34             : 
      35             :   void WakeUp(Module* module) override;
      36             :   void PostTask(std::unique_ptr<rtc::QueuedTask> task) override;
      37             : 
      38             :   void RegisterModule(Module* module) override;
      39             :   void DeRegisterModule(Module* module) override;
      40             : 
      41             :  protected:
      42             :   static bool Run(void* obj);
      43             :   bool Process();
      44             : 
      45             :  private:
      46             :   struct ModuleCallback {
      47             :     ModuleCallback() : module(nullptr), next_callback(0) {}
      48           0 :     ModuleCallback(const ModuleCallback& cb)
      49           0 :         : module(cb.module), next_callback(cb.next_callback) {}
      50           0 :     ModuleCallback(Module* module) : module(module), next_callback(0) {}
      51             :     bool operator==(const ModuleCallback& cb) const {
      52             :       return cb.module == module;
      53             :     }
      54             : 
      55             :     Module* const module;
      56             :     int64_t next_callback;  // Absolute timestamp.
      57             : 
      58             :    private:
      59             :     ModuleCallback& operator=(ModuleCallback&);
      60             :   };
      61             : 
      62             :   typedef std::list<ModuleCallback> ModuleList;
      63             : 
      64             :   // Warning: For some reason, if |lock_| comes immediately before |modules_|
      65             :   // with the current class layout, we will  start to have mysterious crashes
      66             :   // on Mac 10.9 debug.  I (Tommi) suspect we're hitting some obscure alignemnt
      67             :   // issues, but I haven't figured out what they are, if there are alignment
      68             :   // requirements for mutexes on Mac or if there's something else to it.
      69             :   // So be careful with changing the layout.
      70             :   rtc::CriticalSection lock_;  // Used to guard modules_, tasks_ and stop_.
      71             : 
      72             :   rtc::ThreadChecker thread_checker_;
      73             :   const std::unique_ptr<EventWrapper> wake_up_;
      74             :   // TODO(pbos): Remove unique_ptr and stop recreating the thread.
      75             :   std::unique_ptr<rtc::PlatformThread> thread_;
      76             : 
      77             :   ModuleList modules_;
      78             :   std::queue<rtc::QueuedTask*> queue_;
      79             :   bool stop_;
      80             :   const char* thread_name_;
      81             : };
      82             : 
      83             : }  // namespace webrtc
      84             : 
      85             : #endif // WEBRTC_MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_