| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: morlovich@google.com (Maksim Orlovich) |
| |
| #ifndef PAGESPEED_KERNEL_BASE_ATOMIC_BOOL_H_ |
| #define PAGESPEED_KERNEL_BASE_ATOMIC_BOOL_H_ |
| |
| #include "pagespeed/kernel/base/atomicops.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| |
| namespace net_instaweb { |
| |
| // A boolean flag that can be set atomically and be visible to other |
| // threads. Please be extra careful with this --- it can go wrong in |
| // incomprehensible ways; most of the time, you probably want to use a mutex |
| // instead. |
| class AtomicBool { |
| public: |
| // Guaranteed to be initialized to false. |
| AtomicBool() { |
| set_value(false); |
| } |
| |
| ~AtomicBool() {} |
| |
| bool value() const { |
| return base::subtle::Acquire_Load(&value_); |
| } |
| |
| void set_value(bool v) { |
| base::subtle::Release_Store(&value_, v); |
| } |
| |
| private: |
| base::subtle::AtomicWord value_; |
| DISALLOW_COPY_AND_ASSIGN(AtomicBool); |
| }; |
| |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_ATOMIC_BOOL_H_ |