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| author | bms <bms@FreeBSD.org> | 2009-03-12 10:36:39 +0000 |
|---|---|---|
| committer | bms <bms@FreeBSD.org> | 2009-03-12 10:36:39 +0000 |
| commit | 33b0309eb2b6e212d5a03522483eb96411ab631a (patch) | |
| tree | 4cb0b2f97a0365dfcf43dc2b77366541ebfa97b7 /sys/kern/uipc_sem.c | |
| parent | 6049578f97c4464098b12bc2c2f404fe103989a9 (diff) | |
| download | FreeBSD-src-33b0309eb2b6e212d5a03522483eb96411ab631a.zip FreeBSD-src-33b0309eb2b6e212d5a03522483eb96411ab631a.tar.gz | |
Ensure that the semaphore value is re-checked after sem_lock
is re-acquired, after the condition variable is signalled.
PR: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/127545
MFC after: 5 days
Reviewed by: attilio
Diffstat (limited to 'sys/kern/uipc_sem.c')
| -rw-r--r-- | sys/kern/uipc_sem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/uipc_sem.c b/sys/kern/uipc_sem.c index cd78f5b..da233a6 100644 --- a/sys/kern/uipc_sem.c +++ b/sys/kern/uipc_sem.c @@ -727,7 +727,7 @@ kern_sem_wait(struct thread *td, semid_t id, int tryflag, #endif DP(("kern_sem_wait value = %d, tryflag %d\n", ks->ks_value, tryflag)); vfs_timestamp(&ks->ks_atime); - if (ks->ks_value == 0) { + while (ks->ks_value == 0) { ks->ks_waiters++; if (tryflag != 0) error = EAGAIN; |
