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musl
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src
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thread
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sem_trywait.c
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#include
<semaphore.h>
#include
"pthread_impl.h"
int
sem_trywait
(
sem_t
*
sem
)
{
int
val
;
while
((
val
=
sem
->
__val
[
0
])
>
0
)
{
int
new
=
val
-
1
-(
val
==
1
&&
sem
->
__val
[
1
]);
if
(
a_cas
(
sem
->
__val
,
val
,
new
)==
val
)
return
0
;
}
errno
=
EAGAIN
;
return
-
1
;
}