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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/functional/bind.h"
#include "base/task/default_delayed_task_handle_delegate.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/time/time.h"
namespace base {
namespace {
constinit thread_local SequencedTaskRunner::CurrentDefaultHandle*
current_default_handle = nullptr;
} // 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));
PostDelayedTask(from_here, std::move(task), delay);
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());
}
bool SequencedTaskRunner::RunOrPostTask(subtle::RunOrPostTaskPassKey,
const Location& from_here,
OnceClosure task) {
return PostTask(from_here, std::move(task));
}
// static
const scoped_refptr<SequencedTaskRunner>&
SequencedTaskRunner::GetCurrentDefault() {
CHECK(HasCurrentDefault())
<< "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_handle->task_runner_;
}
// static
bool SequencedTaskRunner::HasCurrentDefault() {
return !!current_default_handle && !!current_default_handle->task_runner_;
}
SequencedTaskRunner::CurrentDefaultHandle::CurrentDefaultHandle(
scoped_refptr<SequencedTaskRunner> task_runner)
: CurrentDefaultHandle(std::move(task_runner), MayAlreadyExist{}) {
CHECK(!previous_handle_ || !previous_handle_->task_runner_);
}
SequencedTaskRunner::CurrentDefaultHandle::~CurrentDefaultHandle() {
DCHECK_EQ(current_default_handle, this);
current_default_handle = previous_handle_;
}
SequencedTaskRunner::CurrentDefaultHandle::CurrentDefaultHandle(
scoped_refptr<SequencedTaskRunner> task_runner,
MayAlreadyExist)
: task_runner_(std::move(task_runner)),
previous_handle_(current_default_handle) {
// Support overriding the current default with a null task runner or a task
// runner that runs its tasks in the current sequence.
DCHECK(!task_runner_ || task_runner_->RunsTasksInCurrentSequence());
current_default_handle = this;
}
bool SequencedTaskRunner::DeleteOrReleaseSoonInternal(
const Location& from_here,
void (*deleter)(const void*),
const void* object) {
// Allow memory to leak on shutdown. ScopedFizzleBlockShutdownTasks avoids a
// DCHECK about posting a task to a potentially BLOCK_SHUTDOWN task runner
// after shut down in cleanups that happen as things are reaped in the final
// phases of shutdown (ref. crbug.com/420259698; and other instances).
ThreadPoolInstance::ScopedFizzleBlockShutdownTasks fizzler;
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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