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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/post_task.h"
#include <utility>
#include "base/logging.h"
#include "base/task/scoped_set_task_priority_for_current_thread.h"
#include "base/task/task_executor.h"
#include "base/task/thread_pool/thread_pool_impl.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/threading/post_task_and_reply_impl.h"
namespace base {
namespace {
class PostTaskAndReplyWithTraitsTaskRunner
: public internal::PostTaskAndReplyImpl {
public:
explicit PostTaskAndReplyWithTraitsTaskRunner(const TaskTraits& traits)
: traits_(traits) {}
private:
bool PostTask(const Location& from_here, OnceClosure task) override {
::base::PostTask(from_here, traits_, std::move(task));
return true;
}
const TaskTraits traits_;
};
TaskExecutor* GetTaskExecutorForTraits(const TaskTraits& traits) {
const bool has_extension =
traits.extension_id() != TaskTraitsExtensionStorage::kInvalidExtensionId;
DCHECK(has_extension ^ traits.use_thread_pool())
<< "A destination (e.g. ThreadPool or BrowserThread) must be specified "
"to use the post_task.h API. However, you should prefer the direct "
"thread_pool.h or browser_thread.h APIs in new code.";
if (traits.use_thread_pool()) {
DCHECK(ThreadPoolInstance::Get())
<< "Ref. Prerequisite section of post_task.h for base::ThreadPool "
"usage.\n"
"Hint: if this is in a unit test, you're likely merely missing a "
"base::test::TaskEnvironment member in your fixture (or your "
"fixture is using a base::test::SingleThreadTaskEnvironment and now "
"needs a full base::test::TaskEnvironment).\n";
return static_cast<internal::ThreadPoolImpl*>(ThreadPoolInstance::Get());
}
// Assume |has_extension| per above invariant.
TaskExecutor* executor = GetRegisteredTaskExecutorForTraits(traits);
DCHECK(executor)
<< "A TaskExecutor wasn't yet registered for this extension.\n"
"Hint: if this is in a unit test, you're likely missing a "
"content::BrowserTaskEnvironment member in your fixture.";
return executor;
}
} // namespace
bool PostTask(const Location& from_here, OnceClosure task) {
// TODO(skyostil): Make task traits required here too.
return PostDelayedTask(from_here, {ThreadPool()}, std::move(task),
TimeDelta());
}
bool PostTaskAndReply(const Location& from_here,
OnceClosure task,
OnceClosure reply) {
return PostTaskAndReply(from_here, {ThreadPool()}, std::move(task),
std::move(reply));
}
bool PostTask(const Location& from_here,
const TaskTraits& traits,
OnceClosure task) {
return PostDelayedTask(from_here, traits, std::move(task), TimeDelta());
}
bool PostDelayedTask(const Location& from_here,
const TaskTraits& traits,
OnceClosure task,
TimeDelta delay) {
return GetTaskExecutorForTraits(traits)->PostDelayedTask(
from_here, traits, std::move(task), delay);
}
bool PostTaskAndReply(const Location& from_here,
const TaskTraits& traits,
OnceClosure task,
OnceClosure reply) {
return PostTaskAndReplyWithTraitsTaskRunner(traits).PostTaskAndReply(
from_here, std::move(task), std::move(reply));
}
scoped_refptr<TaskRunner> CreateTaskRunner(const TaskTraits& traits) {
return GetTaskExecutorForTraits(traits)->CreateTaskRunner(traits);
}
scoped_refptr<SequencedTaskRunner> CreateSequencedTaskRunner(
const TaskTraits& traits) {
return GetTaskExecutorForTraits(traits)->CreateSequencedTaskRunner(traits);
}
scoped_refptr<UpdateableSequencedTaskRunner>
CreateUpdateableSequencedTaskRunner(const TaskTraits& traits) {
DCHECK(ThreadPoolInstance::Get())
<< "Ref. Prerequisite section of post_task.h.\n\n"
"Hint: if this is in a unit test, you're likely merely missing a "
"base::test::TaskEnvironment member in your fixture.\n";
DCHECK(traits.use_thread_pool())
<< "The base::UseThreadPool() trait is mandatory with "
"CreateUpdateableSequencedTaskRunner().";
CHECK_EQ(traits.extension_id(),
TaskTraitsExtensionStorage::kInvalidExtensionId)
<< "Extension traits cannot be used with "
"CreateUpdateableSequencedTaskRunner().";
return static_cast<internal::ThreadPoolImpl*>(ThreadPoolInstance::Get())
->CreateUpdateableSequencedTaskRunner(traits);
}
scoped_refptr<SingleThreadTaskRunner> CreateSingleThreadTaskRunner(
const TaskTraits& traits,
SingleThreadTaskRunnerThreadMode thread_mode) {
return GetTaskExecutorForTraits(traits)->CreateSingleThreadTaskRunner(
traits, thread_mode);
}
#if defined(OS_WIN)
scoped_refptr<SingleThreadTaskRunner> CreateCOMSTATaskRunner(
const TaskTraits& traits,
SingleThreadTaskRunnerThreadMode thread_mode) {
return GetTaskExecutorForTraits(traits)->CreateCOMSTATaskRunner(traits,
thread_mode);
}
#endif // defined(OS_WIN)
} // namespace base
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