mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 01:36:09 +03:00
56 lines
2.2 KiB
C++
56 lines
2.2 KiB
C++
// 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.
|
|
|
|
#ifndef BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
|
|
#define BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/callback_helpers.h"
|
|
#include "base/macros.h"
|
|
#include "base/memory/ref_counted.h"
|
|
#include "base/single_thread_task_runner.h"
|
|
|
|
namespace base {
|
|
|
|
// ThreadTaskRunnerHandle stores a reference to a thread's TaskRunner
|
|
// in thread-local storage. Callers can then retrieve the TaskRunner
|
|
// for the current thread by calling ThreadTaskRunnerHandle::Get().
|
|
// At most one TaskRunner may be bound to each thread at a time.
|
|
// Prefer SequencedTaskRunnerHandle to this unless thread affinity is required.
|
|
class BASE_EXPORT ThreadTaskRunnerHandle {
|
|
public:
|
|
// Gets the SingleThreadTaskRunner for the current thread.
|
|
static scoped_refptr<SingleThreadTaskRunner> Get();
|
|
|
|
// Returns true if the SingleThreadTaskRunner is already created for
|
|
// the current thread.
|
|
static bool IsSet();
|
|
|
|
// Overrides ThreadTaskRunnerHandle::Get()'s |task_runner_| to point at
|
|
// |overriding_task_runner| until the returned ScopedClosureRunner goes out of
|
|
// scope (instantiates a ThreadTaskRunnerHandle for that scope if |!IsSet()|).
|
|
// Nested overrides are allowed but callers must ensure the
|
|
// ScopedClosureRunners expire in LIFO (stack) order. Note: nesting
|
|
// ThreadTaskRunnerHandles isn't generally desired but it's useful in unit
|
|
// tests where multiple task runners can share the main thread for simplicity
|
|
// and determinism.
|
|
static ScopedClosureRunner OverrideForTesting(
|
|
scoped_refptr<SingleThreadTaskRunner> overriding_task_runner);
|
|
|
|
// Binds |task_runner| to the current thread. |task_runner| must belong
|
|
// to the current thread for this to succeed.
|
|
explicit ThreadTaskRunnerHandle(
|
|
scoped_refptr<SingleThreadTaskRunner> task_runner);
|
|
~ThreadTaskRunnerHandle();
|
|
|
|
private:
|
|
scoped_refptr<SingleThreadTaskRunner> task_runner_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(ThreadTaskRunnerHandle);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_THREADING_THREAD_TASK_RUNNER_HANDLE_H_
|