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// Copyright 2012 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/task/sequenced_task_runner.h"
#include <utility>
#include "base/bind.h"
#include "base/no_destructor.h"
#include "base/task/default_delayed_task_handle_delegate.h"
#include "base/threading/thread_local.h"
#include "base/time/time.h"
namespace base {
namespace {
ThreadLocalPointer<SequencedTaskRunner::CurrentDefaultHandle>&
CurrentDefaultHandleTls() {
static NoDestructor<
ThreadLocalPointer<SequencedTaskRunner::CurrentDefaultHandle>>
instance;
return *instance;
}
} // namespace
bool SequencedTaskRunner::PostNonNestableTask(const Location& from_here,
OnceClosure task) {
return PostNonNestableDelayedTask(from_here, std::move(task),
base::TimeDelta());
}
DelayedTaskHandle SequencedTaskRunner::PostCancelableDelayedTask(
subtle::PostDelayedTaskPassKey,
const Location& from_here,
OnceClosure task,
TimeDelta delay) {
auto delayed_task_handle_delegate =
std::make_unique<DefaultDelayedTaskHandleDelegate>();
task = delayed_task_handle_delegate->BindCallback(std::move(task));
DelayedTaskHandle delayed_task_handle(
std::move(delayed_task_handle_delegate));
// If the task fails to be posted, the handle will automatically be
// invalidated upon destruction of the callback object.
if (!PostDelayedTask(from_here, std::move(task), delay))
DCHECK(!delayed_task_handle.IsValid());
return delayed_task_handle;
}
DelayedTaskHandle SequencedTaskRunner::PostCancelableDelayedTaskAt(
subtle::PostDelayedTaskPassKey pass_key,
const Location& from_here,
OnceClosure task,
TimeTicks delayed_run_time,
subtle::DelayPolicy deadline_policy) {
auto delayed_task_handle_delegate =
std::make_unique<DefaultDelayedTaskHandleDelegate>();
task = delayed_task_handle_delegate->BindCallback(std::move(task));
DelayedTaskHandle delayed_task_handle(
std::move(delayed_task_handle_delegate));
if (!PostDelayedTaskAt(pass_key, from_here, std::move(task), delayed_run_time,
deadline_policy)) {
DCHECK(!delayed_task_handle.IsValid());
}
return delayed_task_handle;
}
bool SequencedTaskRunner::PostDelayedTaskAt(
subtle::PostDelayedTaskPassKey,
const Location& from_here,
OnceClosure task,
TimeTicks delayed_run_time,
subtle::DelayPolicy deadline_policy) {
return PostDelayedTask(from_here, std::move(task),
delayed_run_time.is_null()
? base::TimeDelta()
: delayed_run_time - TimeTicks::Now());
}
// static
const scoped_refptr<SequencedTaskRunner>&
SequencedTaskRunner::GetCurrentDefault() {
const CurrentDefaultHandle* current_default = CurrentDefaultHandleTls().Get();
CHECK(current_default)
<< "Error: This caller requires a sequenced context (i.e. the current "
"task needs to run from a SequencedTaskRunner). If you're in a test "
"refer to //docs/threading_and_tasks_testing.md.";
return current_default->task_runner_;
}
// static
bool SequencedTaskRunner::HasCurrentDefault() {
return !!CurrentDefaultHandleTls().Get();
}
SequencedTaskRunner::CurrentDefaultHandle::CurrentDefaultHandle(
scoped_refptr<SequencedTaskRunner> task_runner)
: task_runner_(std::move(task_runner)) {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
DCHECK(!SequencedTaskRunner::HasCurrentDefault());
CurrentDefaultHandleTls().Set(this);
}
SequencedTaskRunner::CurrentDefaultHandle::~CurrentDefaultHandle() {
DCHECK(task_runner_->RunsTasksInCurrentSequence());
DCHECK_EQ(CurrentDefaultHandleTls().Get(), this);
CurrentDefaultHandleTls().Set(nullptr);
}
bool SequencedTaskRunner::DeleteOrReleaseSoonInternal(
const Location& from_here,
void (*deleter)(const void*),
const void* object) {
return PostNonNestableTask(from_here, BindOnce(deleter, object));
}
OnTaskRunnerDeleter::OnTaskRunnerDeleter(
scoped_refptr<SequencedTaskRunner> task_runner)
: task_runner_(std::move(task_runner)) {
}
OnTaskRunnerDeleter::~OnTaskRunnerDeleter() = default;
OnTaskRunnerDeleter::OnTaskRunnerDeleter(OnTaskRunnerDeleter&&) = default;
OnTaskRunnerDeleter& OnTaskRunnerDeleter::operator=(
OnTaskRunnerDeleter&&) = default;
} // namespace base
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