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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Ronald S. Bultje |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include "atomic.h" |
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| 22 | |||
| 23 | #if !HAVE_ATOMICS_NATIVE |
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| 24 | |||
| 25 | #if HAVE_PTHREADS |
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| 26 | |||
| 27 | #include |
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| 28 | |||
| 29 | static pthread_mutex_t atomic_lock = PTHREAD_MUTEX_INITIALIZER; |
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| 30 | |||
| 31 | int avpriv_atomic_int_get(volatile int *ptr) |
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| 32 | { |
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| 33 | int res; |
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| 34 | |||
| 35 | pthread_mutex_lock(&atomic_lock); |
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| 36 | res = *ptr; |
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| 37 | pthread_mutex_unlock(&atomic_lock); |
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| 38 | |||
| 39 | return res; |
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| 40 | } |
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| 41 | |||
| 42 | void avpriv_atomic_int_set(volatile int *ptr, int val) |
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| 43 | { |
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| 44 | pthread_mutex_lock(&atomic_lock); |
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| 45 | *ptr = val; |
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| 46 | pthread_mutex_unlock(&atomic_lock); |
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| 47 | } |
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| 48 | |||
| 49 | int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc) |
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| 50 | { |
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| 51 | int res; |
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| 52 | |||
| 53 | pthread_mutex_lock(&atomic_lock); |
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| 54 | *ptr += inc; |
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| 55 | res = *ptr; |
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| 56 | pthread_mutex_unlock(&atomic_lock); |
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| 57 | |||
| 58 | return res; |
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| 59 | } |
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| 60 | |||
| 61 | void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval) |
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| 62 | { |
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| 63 | void *ret; |
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| 64 | pthread_mutex_lock(&atomic_lock); |
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| 65 | ret = *ptr; |
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| 66 | if (*ptr == oldval) |
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| 67 | *ptr = newval; |
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| 68 | pthread_mutex_unlock(&atomic_lock); |
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| 69 | return ret; |
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| 70 | } |
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| 71 | |||
| 72 | #elif !HAVE_THREADS |
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| 73 | |||
| 74 | int avpriv_atomic_int_get(volatile int *ptr) |
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| 75 | { |
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| 76 | return *ptr; |
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| 77 | } |
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| 78 | |||
| 79 | void avpriv_atomic_int_set(volatile int *ptr, int val) |
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| 80 | { |
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| 81 | *ptr = val; |
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| 82 | } |
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| 83 | |||
| 84 | int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc) |
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| 85 | { |
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| 86 | *ptr += inc; |
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| 87 | return *ptr; |
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| 88 | } |
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| 89 | |||
| 90 | void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval) |
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| 91 | { |
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| 92 | if (*ptr == oldval) { |
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| 93 | *ptr = newval; |
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| 94 | return oldval; |
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| 95 | } |
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| 96 | return *ptr; |
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| 97 | } |
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| 98 | |||
| 99 | #else |
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| 100 | |||
| 101 | #error "Threading is enabled, but there is no implementation of atomic operations available" |
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| 102 | |||
| 103 | #endif /* HAVE_PTHREADS */ |
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| 104 | |||
| 105 | #endif /* !HAVE_MEMORYBARRIER && !HAVE_SYNC_VAL_COMPARE_AND_SWAP && !HAVE_MACHINE_RW_BARRIER */ |
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| 106 | |||
| 107 | #ifdef TEST |
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| 108 | #include "avassert.h" |
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| 109 | |||
| 110 | int main(void) |
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| 111 | { |
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| 112 | volatile int val = 1; |
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| 113 | int res; |
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| 114 | |||
| 115 | res = avpriv_atomic_int_add_and_fetch(&val, 1); |
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| 116 | av_assert0(res == 2); |
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| 117 | avpriv_atomic_int_set(&val, 3); |
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| 118 | res = avpriv_atomic_int_get(&val); |
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| 119 | av_assert0(res == 3); |
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| 120 | |||
| 121 | return 0; |
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| 122 | } |
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| 123 | #endif |