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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:31:44 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:31:44 -0800 |
commit | edbf3b6af777b721cd2a1ef461947e51e88241e1 (patch) | |
tree | f09427b843b192cccf8c3b5328cb81dddf6489fa /libs/surfaceflinger/Barrier.h | |
parent | d5193d9394c5e58176d7bcdf50ef017f8a3b9e1e (diff) | |
download | frameworks_native-edbf3b6af777b721cd2a1ef461947e51e88241e1.zip frameworks_native-edbf3b6af777b721cd2a1ef461947e51e88241e1.tar.gz frameworks_native-edbf3b6af777b721cd2a1ef461947e51e88241e1.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'libs/surfaceflinger/Barrier.h')
-rw-r--r-- | libs/surfaceflinger/Barrier.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/libs/surfaceflinger/Barrier.h b/libs/surfaceflinger/Barrier.h new file mode 100644 index 0000000..e2bcf6a --- /dev/null +++ b/libs/surfaceflinger/Barrier.h @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2007 The Android Open Source Project + * + * 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. + */ + +#ifndef ANDROID_BARRIER_H +#define ANDROID_BARRIER_H + +#include <stdint.h> +#include <sys/types.h> +#include <utils/threads.h> + +namespace android { + +class Barrier +{ +public: + inline Barrier() : state(CLOSED) { } + inline ~Barrier() { } + void open() { + // gcc memory barrier, this makes sure all memory writes + // have been issued by gcc. On an SMP system we'd need a real + // h/w barrier. + asm volatile ("":::"memory"); + Mutex::Autolock _l(lock); + state = OPENED; + cv.broadcast(); + } + void close() { + Mutex::Autolock _l(lock); + state = CLOSED; + } + void wait() const { + Mutex::Autolock _l(lock); + while (state == CLOSED) { + cv.wait(lock); + } + } +private: + enum { OPENED, CLOSED }; + mutable Mutex lock; + mutable Condition cv; + volatile int state; +}; + +}; // namespace android + +#endif // ANDROID_BARRIER_H |