| // Copyright (c) 2009 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_CANCELLATION_FLAG_H_ |
| #define BASE_CANCELLATION_FLAG_H_ |
| #pragma once |
| |
| #include "base/atomicops.h" |
| #include "base/platform_thread.h" |
| |
| namespace base { |
| |
| // CancellationFlag allows one thread to cancel jobs executed on some worker |
| // thread. Calling Set() from one thread and IsSet() from a number of threads |
| // is thread-safe. |
| // |
| // This class IS NOT intended for synchronization between threads. |
| class CancellationFlag { |
| public: |
| CancellationFlag() : flag_(false) { |
| #if !defined(NDEBUG) |
| set_on_ = PlatformThread::CurrentId(); |
| #endif |
| } |
| ~CancellationFlag() {} |
| |
| // Set the flag. May only be called on the thread which owns the object. |
| void Set(); |
| bool IsSet() const; // Returns true iff the flag was set. |
| |
| private: |
| base::subtle::Atomic32 flag_; |
| #if !defined(NDEBUG) |
| PlatformThreadId set_on_; |
| #endif |
| |
| DISALLOW_COPY_AND_ASSIGN(CancellationFlag); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_CANCELLATION_FLAG_H_ |