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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
#define MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
#include <stdint.h>
#include <list>
#include <memory>
#include <queue>
#include "api/task_queue/queued_task.h"
#include "modules/include/module.h"
#include "modules/utility/include/process_thread.h"
#include "rtc_base/deprecated/recursive_critical_section.h"
#include "rtc_base/event.h"
#include "rtc_base/location.h"
#include "rtc_base/platform_thread.h"
#include "rtc_base/thread_checker.h"
namespace webrtc {
class ProcessThreadImpl : public ProcessThread {
public:
explicit ProcessThreadImpl(const char* thread_name);
~ProcessThreadImpl() override;
void Start() override;
void Stop() override;
void WakeUp(Module* module) override;
void PostTask(std::unique_ptr<QueuedTask> task) override;
void PostDelayedTask(std::unique_ptr<QueuedTask> task,
uint32_t milliseconds) override;
void RegisterModule(Module* module, const rtc::Location& from) override;
void DeRegisterModule(Module* module) override;
protected:
static void Run(void* obj);
bool Process();
private:
struct ModuleCallback {
ModuleCallback() = delete;
ModuleCallback(ModuleCallback&& cb) = default;
ModuleCallback(const ModuleCallback& cb) = default;
ModuleCallback(Module* module, const rtc::Location& location)
: module(module), location(location) {}
bool operator==(const ModuleCallback& cb) const {
return cb.module == module;
}
Module* const module;
int64_t next_callback = 0; // Absolute timestamp.
const rtc::Location location;
private:
ModuleCallback& operator=(ModuleCallback&);
};
struct DelayedTask {
DelayedTask(int64_t run_at_ms, std::unique_ptr<QueuedTask> task)
: run_at_ms(run_at_ms), task(task.release()) {}
friend bool operator<(const DelayedTask& lhs, const DelayedTask& rhs) {
// Earliest DelayedTask should be at the top of the priority queue.
return lhs.run_at_ms > rhs.run_at_ms;
}
int64_t run_at_ms;
// DelayedTask owns the |task|, but some delayed tasks must be removed from
// the std::priority_queue, but mustn't be deleted. std::priority_queue does
// not give non-const access to the values, so storing unique_ptr would
// delete the task as soon as it is remove from the priority queue.
// Thus lifetime of the |task| is managed manually.
QueuedTask* task;
};
typedef std::list<ModuleCallback> ModuleList;
void Delete() override;
// Warning: For some reason, if |lock_| comes immediately before |modules_|
// with the current class layout, we will start to have mysterious crashes
// on Mac 10.9 debug. I (Tommi) suspect we're hitting some obscure alignemnt
// issues, but I haven't figured out what they are, if there are alignment
// requirements for mutexes on Mac or if there's something else to it.
// So be careful with changing the layout.
rtc::RecursiveCriticalSection
lock_; // Used to guard modules_, tasks_ and stop_.
rtc::ThreadChecker thread_checker_;
rtc::Event wake_up_;
// TODO(pbos): Remove unique_ptr and stop recreating the thread.
std::unique_ptr<rtc::PlatformThread> thread_;
ModuleList modules_;
std::queue<QueuedTask*> queue_;
std::priority_queue<DelayedTask> delayed_tasks_ RTC_GUARDED_BY(lock_);
bool stop_;
const char* thread_name_;
};
} // namespace webrtc
#endif // MODULES_UTILITY_SOURCE_PROCESS_THREAD_IMPL_H_
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