svn commit: r189736 - head/sys/kern
Bruce M Simpson
bms at FreeBSD.org
Thu Mar 12 03:36:40 PDT 2009
Author: bms
Date: Thu Mar 12 10:36:39 2009
New Revision: 189736
URL: http://svn.freebsd.org/changeset/base/189736
Log:
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
Modified:
head/sys/kern/uipc_sem.c
Modified: head/sys/kern/uipc_sem.c
==============================================================================
--- head/sys/kern/uipc_sem.c Thu Mar 12 10:34:16 2009 (r189735)
+++ head/sys/kern/uipc_sem.c Thu Mar 12 10:36:39 2009 (r189736)
@@ -727,7 +727,7 @@ kern_sem_wait(struct thread *td, semid_t
#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;
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