doxygen/3.3/tests_2atomic_8c_source.html

 /*

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public

  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */


 #include "libavutil/atomic.h"

 #include "libavutil/avassert.h"


 int main(void)

 {

     volatile int val      = 1;

     void *tmp1            = (int *)&val;

     void * volatile *tmp2 = &tmp1;

     int res;


     res = avpriv_atomic_int_add_and_fetch(&val, 1);

     av_assert0(res == 2);

     avpriv_atomic_int_set(&val, 3);

     res = avpriv_atomic_int_get(&val);

     av_assert0(res == 3);

     avpriv_atomic_ptr_cas(tmp2, tmp1, &res);

     av_assert0(*tmp2 == &res);


     return 0;

 }

val
const char const char void * val
Definition: avisynth_c.h:771

main
int main(void)
Definition: atomic.c:22

avpriv_atomic_int_get
int avpriv_atomic_int_get(volatile int *ptr)
Load the current value stored in an atomic integer.
Definition: atomic.c:75

av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37

avpriv_atomic_int_set
void avpriv_atomic_int_set(volatile int *ptr, int val)
Store a new value in an atomic integer.
Definition: atomic.c:80

avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().

atomic.h

avpriv_atomic_int_add_and_fetch
int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc)
Add a value to an atomic integer.
Definition: atomic.c:85

avpriv_atomic_ptr_cas
void * avpriv_atomic_ptr_cas(void *volatile *ptr, void *oldval, void *newval)
Atomic pointer compare and swap.
Definition: atomic.c:91