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atomic.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
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8  *
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11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
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17  */
18 
19 #include "libavutil/atomic.h"
20 #include "libavutil/avassert.h"
21 
22 int main(void)
23 {
24  volatile int val = 1;
25  void *tmp1 = (int *)&val;
26  void * volatile *tmp2 = &tmp1;
27  int res;
28 
29  res = avpriv_atomic_int_add_and_fetch(&val, 1);
30  av_assert0(res == 2);
31  avpriv_atomic_int_set(&val, 3);
32  res = avpriv_atomic_int_get(&val);
33  av_assert0(res == 3);
34  avpriv_atomic_ptr_cas(tmp2, tmp1, &res);
35  av_assert0(*tmp2 == &res);
36 
37  return 0;
38 }
const char const char void * val
Definition: avisynth_c.h:771
int main(void)
Definition: atomic.c:22
int avpriv_atomic_int_get(volatile int *ptr)
Load the current value stored in an atomic integer.
Definition: atomic.c:75
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
void avpriv_atomic_int_set(volatile int *ptr, int val)
Store a new value in an atomic integer.
Definition: atomic.c:80
simple assert() macros that are a bit more flexible than ISO C assert().
int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc)
Add a value to an atomic integer.
Definition: atomic.c:85
void * avpriv_atomic_ptr_cas(void *volatile *ptr, void *oldval, void *newval)
Atomic pointer compare and swap.
Definition: atomic.c:91