The Tor Browser: media/omx-plugin/include/froyo/cutils/atomic.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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  */

    17 #ifndef ANDROID_CUTILS_ATOMIC_H

    18 #define ANDROID_CUTILS_ATOMIC_H

    20 #include <stdint.h>

    21 #include <sys/types.h>

    23 #ifdef __cplusplus

    24 extern "C" {

    25 #endif

    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  */

    34 void android_atomic_write(int32_t value, volatile int32_t* addr);

    36 /*

    37  * all these atomic operations return the previous value

    38  */

    41 int32_t android_atomic_inc(volatile int32_t* addr);

    42 int32_t android_atomic_dec(volatile int32_t* addr);

    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);

    48 int32_t android_atomic_swap(int32_t value, volatile int32_t* addr);

    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  */

    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);

    62 /*

    63  * cmpxchg return a non zero value if the exchange was NOT performed,

    64  * in other words if oldvalue != *addr

    65  */

    67 int android_atomic_cmpxchg(int32_t oldvalue, int32_t newvalue,

    68         volatile int32_t* addr);

    70 int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue,

    71         volatile int64_t* addr);

    75 #ifdef __cplusplus

    76 } // extern "C"

    77 #endif

    79 #endif // ANDROID_CUTILS_ATOMIC_H

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