1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/omx-plugin/include/froyo/cutils/atomic.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,79 @@
1.4 +/*
1.5 + * Copyright (C) 2007 The Android Open Source Project
1.6 + *
1.7 + * Licensed under the Apache License, Version 2.0 (the "License");
1.8 + * you may not use this file except in compliance with the License.
1.9 + * You may obtain a copy of the License at
1.10 + *
1.11 + * http://www.apache.org/licenses/LICENSE-2.0
1.12 + *
1.13 + * Unless required by applicable law or agreed to in writing, software
1.14 + * distributed under the License is distributed on an "AS IS" BASIS,
1.15 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.16 + * See the License for the specific language governing permissions and
1.17 + * limitations under the License.
1.18 + */
1.19 +
1.20 +#ifndef ANDROID_CUTILS_ATOMIC_H
1.21 +#define ANDROID_CUTILS_ATOMIC_H
1.22 +
1.23 +#include <stdint.h>
1.24 +#include <sys/types.h>
1.25 +
1.26 +#ifdef __cplusplus
1.27 +extern "C" {
1.28 +#endif
1.29 +
1.30 +/*
1.31 + * NOTE: memory shared between threads is synchronized by all atomic operations
1.32 + * below, this means that no explicit memory barrier is required: all reads or
1.33 + * writes issued before android_atomic_* operations are guaranteed to complete
1.34 + * before the atomic operation takes place.
1.35 + */
1.36 +
1.37 +void android_atomic_write(int32_t value, volatile int32_t* addr);
1.38 +
1.39 +/*
1.40 + * all these atomic operations return the previous value
1.41 + */
1.42 +
1.43 +
1.44 +int32_t android_atomic_inc(volatile int32_t* addr);
1.45 +int32_t android_atomic_dec(volatile int32_t* addr);
1.46 +
1.47 +int32_t android_atomic_add(int32_t value, volatile int32_t* addr);
1.48 +int32_t android_atomic_and(int32_t value, volatile int32_t* addr);
1.49 +int32_t android_atomic_or(int32_t value, volatile int32_t* addr);
1.50 +
1.51 +int32_t android_atomic_swap(int32_t value, volatile int32_t* addr);
1.52 +
1.53 +/*
1.54 + * NOTE: Two "quasiatomic" operations on the exact same memory address
1.55 + * are guaranteed to operate atomically with respect to each other,
1.56 + * but no guarantees are made about quasiatomic operations mixed with
1.57 + * non-quasiatomic operations on the same address, nor about
1.58 + * quasiatomic operations that are performed on partially-overlapping
1.59 + * memory.
1.60 + */
1.61 +
1.62 +int64_t android_quasiatomic_swap_64(int64_t value, volatile int64_t* addr);
1.63 +int64_t android_quasiatomic_read_64(volatile int64_t* addr);
1.64 +
1.65 +/*
1.66 + * cmpxchg return a non zero value if the exchange was NOT performed,
1.67 + * in other words if oldvalue != *addr
1.68 + */
1.69 +
1.70 +int android_atomic_cmpxchg(int32_t oldvalue, int32_t newvalue,
1.71 + volatile int32_t* addr);
1.72 +
1.73 +int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue,
1.74 + volatile int64_t* addr);
1.75 +
1.76 +
1.77 +
1.78 +#ifdef __cplusplus
1.79 +} // extern "C"
1.80 +#endif
1.81 +
1.82 +#endif // ANDROID_CUTILS_ATOMIC_H
