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change sem_trywait algorithm so it never has to call __wake
author
Rich Felker
<dalias@aerifal.cx>
Thu, 14 Apr 2011 19:10:50 +0000
(15:10 -0400)
committer
Rich Felker
<dalias@aerifal.cx>
Thu, 14 Apr 2011 19:10:50 +0000
(15:10 -0400)
src/thread/sem_trywait.c
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diff --git
a/src/thread/sem_trywait.c
b/src/thread/sem_trywait.c
index
beb7aa5
..
dd8f57e
100644
(file)
--- a/
src/thread/sem_trywait.c
+++ b/
src/thread/sem_trywait.c
@@
-3,9
+3,8
@@
int sem_trywait(sem_t *sem)
{
- if (a_fetch_add(sem->__val, -1) > 0) return 0;
- if (!a_fetch_add(sem->__val, 1) && sem->__val[1])
- __wake(sem->__val, 1, 0);
+ int val = sem->__val[0];
+ if (val>0 && a_cas(sem->__val, val, val-1)==val) return 0;
errno = EAGAIN;
return -1;
}