mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2026-06-04 21:36:29 +03:00
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
// Copyright 2013 The Chromium Authors
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "base/one_shot_event.h"
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <algorithm>
|
|
#include <utility>
|
|
|
|
#include "base/functional/callback.h"
|
|
#include "base/location.h"
|
|
#include "base/sequence_checker.h"
|
|
#include "base/task/task_runner.h"
|
|
#include "base/time/time.h"
|
|
|
|
namespace base {
|
|
|
|
struct OneShotEvent::TaskInfo {
|
|
TaskInfo() = default;
|
|
TaskInfo(const Location& from_here,
|
|
scoped_refptr<TaskRunner> runner,
|
|
OnceClosure task,
|
|
const TimeDelta& delay)
|
|
: from_here(from_here),
|
|
runner(std::move(runner)),
|
|
task(std::move(task)),
|
|
delay(delay) {
|
|
CHECK(this->runner); // Detect mistakes with a decent stack frame.
|
|
}
|
|
TaskInfo(TaskInfo&&) = default;
|
|
TaskInfo& operator=(TaskInfo&&) = default;
|
|
|
|
Location from_here;
|
|
scoped_refptr<TaskRunner> runner;
|
|
OnceClosure task;
|
|
TimeDelta delay;
|
|
};
|
|
|
|
OneShotEvent::OneShotEvent() {
|
|
// It's acceptable to construct the `OneShotEvent` on one sequence, but
|
|
// immediately move it to another sequence.
|
|
DETACH_FROM_SEQUENCE(sequence_checker_);
|
|
}
|
|
OneShotEvent::OneShotEvent(bool signaled) : signaled_(signaled) {
|
|
DETACH_FROM_SEQUENCE(sequence_checker_);
|
|
}
|
|
OneShotEvent::~OneShotEvent() = default;
|
|
|
|
void OneShotEvent::Post(const Location& from_here,
|
|
OnceClosure task,
|
|
scoped_refptr<TaskRunner> runner) const {
|
|
PostDelayed(from_here, std::move(task), TimeDelta(), std::move(runner));
|
|
}
|
|
|
|
void OneShotEvent::PostDelayed(const Location& from_here,
|
|
OnceClosure task,
|
|
const TimeDelta& delay,
|
|
scoped_refptr<TaskRunner> runner) const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
|
|
if (is_signaled()) {
|
|
runner->PostDelayedTask(from_here, std::move(task), delay);
|
|
} else {
|
|
tasks_.emplace_back(from_here, std::move(runner), std::move(task), delay);
|
|
}
|
|
}
|
|
|
|
void OneShotEvent::Signal() {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
|
|
CHECK(!signaled_) << "Only call Signal once.";
|
|
|
|
signaled_ = true;
|
|
// After this point, a call to `Post` from one of the queued tasks could
|
|
// proceed immediately, but the fact that this object is sequence-bound
|
|
// prevents that from being relevant.
|
|
|
|
// Move tasks to a temporary to ensure no new ones are added.
|
|
std::vector<TaskInfo> moved_tasks = std::exchange(tasks_, {});
|
|
|
|
// We could randomize tasks in debug mode in order to check that
|
|
// the order doesn't matter...
|
|
for (TaskInfo& task : moved_tasks) {
|
|
task.runner->PostDelayedTask(task.from_here, std::move(task.task),
|
|
task.delay);
|
|
}
|
|
DCHECK(tasks_.empty()) << "No new tasks should be added during task running!";
|
|
}
|
|
|
|
} // namespace base
|