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Revert "Revert back to using the task_queue_ for guarding access."

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This reverts commit 475006d4a30f8bc47f82eb540a6a066da2829095.

Reason for revert: Speculative revert. Breaks downstream project

Original change's description:
> Revert back to using the task_queue_ for guarding access.
> 
> This removes the SequenceChecker that was temporarily used while
> the rtc::Thread TQ implementation was being fixed.
> 
> Bug: none
> Change-Id: Iaa46e47371211ac0a97b2dcaf23cef12b43ee8ea
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175081
> Commit-Queue: Tommi <tommi@webrtc.org>
> Reviewed-by: Sebastian Jansson <srte@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#31256}

TBR=tommi@webrtc.org,srte@webrtc.org

Change-Id: I17a12bdca888a63f2fd161da30c0def5b9c3d04e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175103
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31258}
This commit is contained in:
Artem Titov 2020-05-14 13:52:14 +00:00 committed by Commit Bot
parent 87a6e5ab4d
commit af1b9ceb62
2 changed files with 12 additions and 3 deletions
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5
rtc_base/task_utils/repeating_task.cc
View File

@ -21,12 +21,13 @@ RepeatingTaskBase::RepeatingTaskBase(TaskQueueBase* task_queue,
TimeDelta first_delay)
: task_queue_(task_queue),
next_run_time_(Timestamp::Micros(rtc::TimeMicros()) + first_delay) {
sequence_checker_.Detach();
}
RepeatingTaskBase::~RepeatingTaskBase() = default;
bool RepeatingTaskBase::Run() {
RTC_DCHECK_RUN_ON(task_queue_);
RTC_DCHECK_RUN_ON(&sequence_checker_);
// Return true to tell the TaskQueue to destruct this object.
if (next_run_time_.IsPlusInfinity())
return true;
@ -52,7 +53,7 @@ bool RepeatingTaskBase::Run() {
}
void RepeatingTaskBase::Stop() {
RTC_DCHECK_RUN_ON(task_queue_);
RTC_DCHECK_RUN_ON(&sequence_checker_);
RTC_DCHECK(next_run_time_.IsFinite());
next_run_time_ = Timestamp::PlusInfinity();
}

10
rtc_base/task_utils/repeating_task.h
View File

@ -19,6 +19,7 @@
#include "api/task_queue/task_queue_base.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/synchronization/sequence_checker.h"
namespace webrtc {
@ -40,7 +41,14 @@ class RepeatingTaskBase : public QueuedTask {
TaskQueueBase* const task_queue_;
// This is always finite, except for the special case where it's PlusInfinity
// to signal that the task should stop.
Timestamp next_run_time_ RTC_GUARDED_BY(task_queue_);
Timestamp next_run_time_ RTC_GUARDED_BY(sequence_checker_);
// We use a SequenceChecker to check for correct usage instead of using
// RTC_DCHECK_RUN_ON(task_queue_). This is to work around a compatibility
// issue with some TQ implementations such as rtc::Thread that don't
// consistently set themselves as the 'current' TQ when running tasks.
// The SequenceChecker detects those implementations differently but gives
// the same effect as far as thread safety goes.
SequenceChecker sequence_checker_;
};
// The template closure pattern is based on rtc::ClosureTask.