28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
/*
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* libjingle
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* Copyright 2004--2006, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_TASKRUNNER_H__
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#define TALK_BASE_TASKRUNNER_H__
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#include <vector>
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#include "talk/base/basictypes.h"
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#include "talk/base/sigslot.h"
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#include "talk/base/taskparent.h"
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namespace talk_base {
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class Task;
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const int64 kSecToMsec = 1000;
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const int64 kMsecTo100ns = 10000;
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const int64 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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virtual ~TaskRunner();
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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 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 previous_task_timeout_time);
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#ifdef _DEBUG
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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 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 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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#ifdef _DEBUG
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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 talk_base
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#endif // TASK_BASE_TASKRUNNER_H__
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