101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_TASKRUNNER_H__
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#define WEBRTC_BASE_TASKRUNNER_H__
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#include <vector>
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#include "webrtc/base/basictypes.h"
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#include "webrtc/base/sigslot.h"
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#include "webrtc/base/taskparent.h"
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namespace rtc {
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class Task;
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const int64_t kSecToMsec = 1000;
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const int64_t kMsecTo100ns = 10000;
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const int64_t kSecTo100ns = kSecToMsec * kMsecTo100ns;
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class TaskRunner : public TaskParent, public sigslot::has_slots<> {
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public:
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TaskRunner();
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~TaskRunner() override;
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virtual void WakeTasks() = 0;
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// Returns the current time in 100ns units. It is used for
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// determining timeouts. The origin is not important, only
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// the units and that rollover while the computer is running.
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//
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// On Windows, GetSystemTimeAsFileTime is the typical implementation.
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virtual int64_t CurrentTime() = 0;
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void StartTask(Task *task);
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void RunTasks();
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void PollTasks();
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void UpdateTaskTimeout(Task* task, int64_t previous_task_timeout_time);
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#if !defined(NDEBUG)
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bool is_ok_to_delete(Task* task) {
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return task == deleting_task_;
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}
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void IncrementAbortCount() {
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++abort_count_;
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}
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void DecrementAbortCount() {
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--abort_count_;
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}
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#endif
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// Returns the next absolute time when a task times out
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// OR "0" if there is no next timeout.
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int64_t next_task_timeout() const;
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protected:
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// The primary usage of this method is to know if
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// a callback timer needs to be set-up or adjusted.
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// This method will be called
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// * when the next_task_timeout() becomes a smaller value OR
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// * when next_task_timeout() has changed values and the previous
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// value is in the past.
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//
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// If the next_task_timeout moves to the future, this method will *not*
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// get called (because it subclass should check next_task_timeout()
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// when its timer goes off up to see if it needs to set-up a new timer).
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//
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// Note that this maybe called conservatively. In that it may be
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// called when no time change has happened.
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virtual void OnTimeoutChange() {
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// by default, do nothing.
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}
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private:
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void InternalRunTasks(bool in_destructor);
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void CheckForTimeoutChange(int64_t previous_timeout_time);
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std::vector<Task *> tasks_;
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Task *next_timeout_task_;
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bool tasks_running_;
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#if !defined(NDEBUG)
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int abort_count_;
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Task* deleting_task_;
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#endif
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void RecalcNextTimeout(Task *exclude_task);
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};
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} // namespace rtc
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#endif // TASK_BASE_TASKRUNNER_H__
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