28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
290 lines
7.3 KiB
C++
290 lines
7.3 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include "talk/base/task.h"
|
|
#include "talk/base/common.h"
|
|
#include "talk/base/taskrunner.h"
|
|
|
|
namespace talk_base {
|
|
|
|
int32 Task::unique_id_seed_ = 0;
|
|
|
|
Task::Task(TaskParent *parent)
|
|
: TaskParent(this, parent),
|
|
state_(STATE_INIT),
|
|
blocked_(false),
|
|
done_(false),
|
|
aborted_(false),
|
|
busy_(false),
|
|
error_(false),
|
|
start_time_(0),
|
|
timeout_time_(0),
|
|
timeout_seconds_(0),
|
|
timeout_suspended_(false) {
|
|
unique_id_ = unique_id_seed_++;
|
|
|
|
// sanity check that we didn't roll-over our id seed
|
|
ASSERT(unique_id_ < unique_id_seed_);
|
|
}
|
|
|
|
Task::~Task() {
|
|
// Is this task being deleted in the correct manner?
|
|
ASSERT(!done_ || GetRunner()->is_ok_to_delete(this));
|
|
ASSERT(state_ == STATE_INIT || done_);
|
|
ASSERT(state_ == STATE_INIT || blocked_);
|
|
|
|
// If the task is being deleted without being done, it
|
|
// means that it hasn't been removed from its parent.
|
|
// This happens if a task is deleted outside of TaskRunner.
|
|
if (!done_) {
|
|
Stop();
|
|
}
|
|
}
|
|
|
|
int64 Task::CurrentTime() {
|
|
return GetRunner()->CurrentTime();
|
|
}
|
|
|
|
int64 Task::ElapsedTime() {
|
|
return CurrentTime() - start_time_;
|
|
}
|
|
|
|
void Task::Start() {
|
|
if (state_ != STATE_INIT)
|
|
return;
|
|
// Set the start time before starting the task. Otherwise if the task
|
|
// finishes quickly and deletes the Task object, setting start_time_
|
|
// will crash.
|
|
start_time_ = CurrentTime();
|
|
GetRunner()->StartTask(this);
|
|
}
|
|
|
|
void Task::Step() {
|
|
if (done_) {
|
|
#ifdef _DEBUG
|
|
// we do not know how !blocked_ happens when done_ - should be impossible.
|
|
// But it causes problems, so in retail build, we force blocked_, and
|
|
// under debug we assert.
|
|
ASSERT(blocked_);
|
|
#else
|
|
blocked_ = true;
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
// Async Error() was called
|
|
if (error_) {
|
|
done_ = true;
|
|
state_ = STATE_ERROR;
|
|
blocked_ = true;
|
|
// obsolete - an errored task is not considered done now
|
|
// SignalDone();
|
|
|
|
Stop();
|
|
#ifdef _DEBUG
|
|
// verify that stop removed this from its parent
|
|
ASSERT(!parent()->IsChildTask(this));
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
busy_ = true;
|
|
int new_state = Process(state_);
|
|
busy_ = false;
|
|
|
|
if (aborted_) {
|
|
Abort(true); // no need to wake because we're awake
|
|
return;
|
|
}
|
|
|
|
if (new_state == STATE_BLOCKED) {
|
|
blocked_ = true;
|
|
// Let the timeout continue
|
|
} else {
|
|
state_ = new_state;
|
|
blocked_ = false;
|
|
ResetTimeout();
|
|
}
|
|
|
|
if (new_state == STATE_DONE) {
|
|
done_ = true;
|
|
} else if (new_state == STATE_ERROR) {
|
|
done_ = true;
|
|
error_ = true;
|
|
}
|
|
|
|
if (done_) {
|
|
// obsolete - call this yourself
|
|
// SignalDone();
|
|
|
|
Stop();
|
|
#if _DEBUG
|
|
// verify that stop removed this from its parent
|
|
ASSERT(!parent()->IsChildTask(this));
|
|
#endif
|
|
blocked_ = true;
|
|
}
|
|
}
|
|
|
|
void Task::Abort(bool nowake) {
|
|
// Why only check for done_ (instead of "aborted_ || done_")?
|
|
//
|
|
// If aborted_ && !done_, it means the logic for aborting still
|
|
// needs to be executed (because busy_ must have been true when
|
|
// Abort() was previously called).
|
|
if (done_)
|
|
return;
|
|
aborted_ = true;
|
|
if (!busy_) {
|
|
done_ = true;
|
|
blocked_ = true;
|
|
error_ = true;
|
|
|
|
// "done_" is set before calling "Stop()" to ensure that this code
|
|
// doesn't execute more than once (recursively) for the same task.
|
|
Stop();
|
|
#ifdef _DEBUG
|
|
// verify that stop removed this from its parent
|
|
ASSERT(!parent()->IsChildTask(this));
|
|
#endif
|
|
if (!nowake) {
|
|
// WakeTasks to self-delete.
|
|
// Don't call Wake() because it is a no-op after "done_" is set.
|
|
// Even if Wake() did run, it clears "blocked_" which isn't desireable.
|
|
GetRunner()->WakeTasks();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Task::Wake() {
|
|
if (done_)
|
|
return;
|
|
if (blocked_) {
|
|
blocked_ = false;
|
|
GetRunner()->WakeTasks();
|
|
}
|
|
}
|
|
|
|
void Task::Error() {
|
|
if (error_ || done_)
|
|
return;
|
|
error_ = true;
|
|
Wake();
|
|
}
|
|
|
|
std::string Task::GetStateName(int state) const {
|
|
switch (state) {
|
|
case STATE_BLOCKED: return "BLOCKED";
|
|
case STATE_INIT: return "INIT";
|
|
case STATE_START: return "START";
|
|
case STATE_DONE: return "DONE";
|
|
case STATE_ERROR: return "ERROR";
|
|
case STATE_RESPONSE: return "RESPONSE";
|
|
}
|
|
return "??";
|
|
}
|
|
|
|
int Task::Process(int state) {
|
|
int newstate = STATE_ERROR;
|
|
|
|
if (TimedOut()) {
|
|
ClearTimeout();
|
|
newstate = OnTimeout();
|
|
SignalTimeout();
|
|
} else {
|
|
switch (state) {
|
|
case STATE_INIT:
|
|
newstate = STATE_START;
|
|
break;
|
|
case STATE_START:
|
|
newstate = ProcessStart();
|
|
break;
|
|
case STATE_RESPONSE:
|
|
newstate = ProcessResponse();
|
|
break;
|
|
case STATE_DONE:
|
|
case STATE_ERROR:
|
|
newstate = STATE_BLOCKED;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return newstate;
|
|
}
|
|
|
|
void Task::Stop() {
|
|
// No need to wake because we're either awake or in abort
|
|
TaskParent::OnStopped(this);
|
|
}
|
|
|
|
void Task::set_timeout_seconds(const int timeout_seconds) {
|
|
timeout_seconds_ = timeout_seconds;
|
|
ResetTimeout();
|
|
}
|
|
|
|
bool Task::TimedOut() {
|
|
return timeout_seconds_ &&
|
|
timeout_time_ &&
|
|
CurrentTime() >= timeout_time_;
|
|
}
|
|
|
|
void Task::ResetTimeout() {
|
|
int64 previous_timeout_time = timeout_time_;
|
|
bool timeout_allowed = (state_ != STATE_INIT)
|
|
&& (state_ != STATE_DONE)
|
|
&& (state_ != STATE_ERROR);
|
|
if (timeout_seconds_ && timeout_allowed && !timeout_suspended_)
|
|
timeout_time_ = CurrentTime() +
|
|
(timeout_seconds_ * kSecToMsec * kMsecTo100ns);
|
|
else
|
|
timeout_time_ = 0;
|
|
|
|
GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
|
|
}
|
|
|
|
void Task::ClearTimeout() {
|
|
int64 previous_timeout_time = timeout_time_;
|
|
timeout_time_ = 0;
|
|
GetRunner()->UpdateTaskTimeout(this, previous_timeout_time);
|
|
}
|
|
|
|
void Task::SuspendTimeout() {
|
|
if (!timeout_suspended_) {
|
|
timeout_suspended_ = true;
|
|
ResetTimeout();
|
|
}
|
|
}
|
|
|
|
void Task::ResumeTimeout() {
|
|
if (timeout_suspended_) {
|
|
timeout_suspended_ = false;
|
|
ResetTimeout();
|
|
}
|
|
}
|
|
|
|
} // namespace talk_base
|