media/omx-plugin/include/froyo/cutils/atomic.h@b8a032363ba2 (annotated)
media/omx-plugin/include/froyo/cutils/atomic.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2007 The Android Open Source Project |
| michael@0 | 3 | * |
| michael@0 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| michael@0 | 5 | * you may not use this file except in compliance with the License. |
| michael@0 | 6 | * You may obtain a copy of the License at |
| michael@0 | 7 | * |
| michael@0 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| michael@0 | 9 | * |
| michael@0 | 10 | * Unless required by applicable law or agreed to in writing, software |
| michael@0 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| michael@0 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| michael@0 | 13 | * See the License for the specific language governing permissions and |
| michael@0 | 14 | * limitations under the License. |
| michael@0 | 15 | */ |
| michael@0 | 16 | |
| michael@0 | 17 | #ifndef ANDROID_CUTILS_ATOMIC_H |
| michael@0 | 18 | #define ANDROID_CUTILS_ATOMIC_H |
| michael@0 | 19 | |
| michael@0 | 20 | #include <stdint.h> |
| michael@0 | 21 | #include <sys/types.h> |
| michael@0 | 22 | |
| michael@0 | 23 | #ifdef __cplusplus |
| michael@0 | 24 | extern "C" { |
| michael@0 | 25 | #endif |
| michael@0 | 26 | |
| michael@0 | 27 | /* |
| michael@0 | 28 | * NOTE: memory shared between threads is synchronized by all atomic operations |
| michael@0 | 29 | * below, this means that no explicit memory barrier is required: all reads or |
| michael@0 | 30 | * writes issued before android_atomic_* operations are guaranteed to complete |
| michael@0 | 31 | * before the atomic operation takes place. |
| michael@0 | 32 | */ |
| michael@0 | 33 | |
| michael@0 | 34 | void android_atomic_write(int32_t value, volatile int32_t* addr); |
| michael@0 | 35 | |
| michael@0 | 36 | /* |
| michael@0 | 37 | * all these atomic operations return the previous value |
| michael@0 | 38 | */ |
| michael@0 | 39 | |
| michael@0 | 40 | |
| michael@0 | 41 | int32_t android_atomic_inc(volatile int32_t* addr); |
| michael@0 | 42 | int32_t android_atomic_dec(volatile int32_t* addr); |
| michael@0 | 43 | |
| michael@0 | 44 | int32_t android_atomic_add(int32_t value, volatile int32_t* addr); |
| michael@0 | 45 | int32_t android_atomic_and(int32_t value, volatile int32_t* addr); |
| michael@0 | 46 | int32_t android_atomic_or(int32_t value, volatile int32_t* addr); |
| michael@0 | 47 | |
| michael@0 | 48 | int32_t android_atomic_swap(int32_t value, volatile int32_t* addr); |
| michael@0 | 49 | |
| michael@0 | 50 | /* |
| michael@0 | 51 | * NOTE: Two "quasiatomic" operations on the exact same memory address |
| michael@0 | 52 | * are guaranteed to operate atomically with respect to each other, |
| michael@0 | 53 | * but no guarantees are made about quasiatomic operations mixed with |
| michael@0 | 54 | * non-quasiatomic operations on the same address, nor about |
| michael@0 | 55 | * quasiatomic operations that are performed on partially-overlapping |
| michael@0 | 56 | * memory. |
| michael@0 | 57 | */ |
| michael@0 | 58 | |
| michael@0 | 59 | int64_t android_quasiatomic_swap_64(int64_t value, volatile int64_t* addr); |
| michael@0 | 60 | int64_t android_quasiatomic_read_64(volatile int64_t* addr); |
| michael@0 | 61 | |
| michael@0 | 62 | /* |
| michael@0 | 63 | * cmpxchg return a non zero value if the exchange was NOT performed, |
| michael@0 | 64 | * in other words if oldvalue != *addr |
| michael@0 | 65 | */ |
| michael@0 | 66 | |
| michael@0 | 67 | int android_atomic_cmpxchg(int32_t oldvalue, int32_t newvalue, |
| michael@0 | 68 | volatile int32_t* addr); |
| michael@0 | 69 | |
| michael@0 | 70 | int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue, |
| michael@0 | 71 | volatile int64_t* addr); |
| michael@0 | 72 | |
| michael@0 | 73 | |
| michael@0 | 74 | |
| michael@0 | 75 | #ifdef __cplusplus |
| michael@0 | 76 | } // extern "C" |
| michael@0 | 77 | #endif |
| michael@0 | 78 | |
| michael@0 | 79 | #endif // ANDROID_CUTILS_ATOMIC_H |
