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comparison: media/omx-plugin/include/froyo/cutils/atomic.h
media/omx-plugin/include/froyo/cutils/atomic.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:3dcca95c3c2f |
|---|---|
| 1 /* | |
| 2 * Copyright (C) 2007 The Android Open Source Project | |
| 3 * | |
| 4 * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 * you may not use this file except in compliance with the License. | |
| 6 * You may obtain a copy of the License at | |
| 7 * | |
| 8 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 * | |
| 10 * Unless required by applicable law or agreed to in writing, software | |
| 11 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 * See the License for the specific language governing permissions and | |
| 14 * limitations under the License. | |
| 15 */ | |
| 16 | |
| 17 #ifndef ANDROID_CUTILS_ATOMIC_H | |
| 18 #define ANDROID_CUTILS_ATOMIC_H | |
| 19 | |
| 20 #include <stdint.h> | |
| 21 #include <sys/types.h> | |
| 22 | |
| 23 #ifdef __cplusplus | |
| 24 extern "C" { | |
| 25 #endif | |
| 26 | |
| 27 /* | |
| 28 * NOTE: memory shared between threads is synchronized by all atomic operations | |
| 29 * below, this means that no explicit memory barrier is required: all reads or | |
| 30 * writes issued before android_atomic_* operations are guaranteed to complete | |
| 31 * before the atomic operation takes place. | |
| 32 */ | |
| 33 | |
| 34 void android_atomic_write(int32_t value, volatile int32_t* addr); | |
| 35 | |
| 36 /* | |
| 37 * all these atomic operations return the previous value | |
| 38 */ | |
| 39 | |
| 40 | |
| 41 int32_t android_atomic_inc(volatile int32_t* addr); | |
| 42 int32_t android_atomic_dec(volatile int32_t* addr); | |
| 43 | |
| 44 int32_t android_atomic_add(int32_t value, volatile int32_t* addr); | |
| 45 int32_t android_atomic_and(int32_t value, volatile int32_t* addr); | |
| 46 int32_t android_atomic_or(int32_t value, volatile int32_t* addr); | |
| 47 | |
| 48 int32_t android_atomic_swap(int32_t value, volatile int32_t* addr); | |
| 49 | |
| 50 /* | |
| 51 * NOTE: Two "quasiatomic" operations on the exact same memory address | |
| 52 * are guaranteed to operate atomically with respect to each other, | |
| 53 * but no guarantees are made about quasiatomic operations mixed with | |
| 54 * non-quasiatomic operations on the same address, nor about | |
| 55 * quasiatomic operations that are performed on partially-overlapping | |
| 56 * memory. | |
| 57 */ | |
| 58 | |
| 59 int64_t android_quasiatomic_swap_64(int64_t value, volatile int64_t* addr); | |
| 60 int64_t android_quasiatomic_read_64(volatile int64_t* addr); | |
| 61 | |
| 62 /* | |
| 63 * cmpxchg return a non zero value if the exchange was NOT performed, | |
| 64 * in other words if oldvalue != *addr | |
| 65 */ | |
| 66 | |
| 67 int android_atomic_cmpxchg(int32_t oldvalue, int32_t newvalue, | |
| 68 volatile int32_t* addr); | |
| 69 | |
| 70 int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue, | |
| 71 volatile int64_t* addr); | |
| 72 | |
| 73 | |
| 74 | |
| 75 #ifdef __cplusplus | |
| 76 } // extern "C" | |
| 77 #endif | |
| 78 | |
| 79 #endif // ANDROID_CUTILS_ATOMIC_H |
