Adds trunk/talk folder of revision 359 from libjingles google code to
trunk/talk
git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/base/taskrunner.h b/talk/base/taskrunner.h
new file mode 100644
index 0000000..f34a609
--- /dev/null
+++ b/talk/base/taskrunner.h
@@ -0,0 +1,117 @@
+/*
+ * libjingle
+ * Copyright 2004--2006, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_BASE_TASKRUNNER_H__
+#define TALK_BASE_TASKRUNNER_H__
+
+#include <vector>
+
+#include "talk/base/basictypes.h"
+#include "talk/base/sigslot.h"
+#include "talk/base/taskparent.h"
+
+namespace talk_base {
+class Task;
+
+const int64 kSecToMsec = 1000;
+const int64 kMsecTo100ns = 10000;
+const int64 kSecTo100ns = kSecToMsec * kMsecTo100ns;
+
+class TaskRunner : public TaskParent, public sigslot::has_slots<> {
+ public:
+ TaskRunner();
+ virtual ~TaskRunner();
+
+ virtual void WakeTasks() = 0;
+
+ // Returns the current time in 100ns units. It is used for
+ // determining timeouts. The origin is not important, only
+ // the units and that rollover while the computer is running.
+ //
+ // On Windows, GetSystemTimeAsFileTime is the typical implementation.
+ virtual int64 CurrentTime() = 0 ;
+
+ void StartTask(Task *task);
+ void RunTasks();
+ void PollTasks();
+
+ void UpdateTaskTimeout(Task *task, int64 previous_task_timeout_time);
+
+#ifdef _DEBUG
+ bool is_ok_to_delete(Task* task) {
+ return task == deleting_task_;
+ }
+
+ void IncrementAbortCount() {
+ ++abort_count_;
+ }
+
+ void DecrementAbortCount() {
+ --abort_count_;
+ }
+#endif
+
+ // Returns the next absolute time when a task times out
+ // OR "0" if there is no next timeout.
+ int64 next_task_timeout() const;
+
+ protected:
+ // The primary usage of this method is to know if
+ // a callback timer needs to be set-up or adjusted.
+ // This method will be called
+ // * when the next_task_timeout() becomes a smaller value OR
+ // * when next_task_timeout() has changed values and the previous
+ // value is in the past.
+ //
+ // If the next_task_timeout moves to the future, this method will *not*
+ // get called (because it subclass should check next_task_timeout()
+ // when its timer goes off up to see if it needs to set-up a new timer).
+ //
+ // Note that this maybe called conservatively. In that it may be
+ // called when no time change has happened.
+ virtual void OnTimeoutChange() {
+ // by default, do nothing.
+ }
+
+ private:
+ void InternalRunTasks(bool in_destructor);
+ void CheckForTimeoutChange(int64 previous_timeout_time);
+
+ std::vector<Task *> tasks_;
+ Task *next_timeout_task_;
+ bool tasks_running_;
+#ifdef _DEBUG
+ int abort_count_;
+ Task* deleting_task_;
+#endif
+
+ void RecalcNextTimeout(Task *exclude_task);
+};
+
+} // namespace talk_base
+
+#endif // TASK_BASE_TASKRUNNER_H__