Module Name: src
Committed By: christos
Date: Thu Mar 28 18:07:12 UTC 2013
Modified Files:
src/lib/libpthread: pthread_cond.c
Log Message:
PR/47703: Yasushi Oshima: pthread_cond_timedwait() does not wait
after call pthread_condattr_setclock(CLOCK_MONOTONIC)
_lwp_park(2) expects a realtime clock, and it gets passed a monotonic
one. Since monotonic < real, it never sleeps. This patch adjusts
the monotonic clock to be a real one before it passes is to
_lwp_park(2). This is the minimal hacky fix and it will be fixed
properly in _lwp_park(2) in the future.
XXX: pullup to 6.
To generate a diff of this commit:
cvs rdiff -u -r1.59 -r1.60 src/lib/libpthread/pthread_cond.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/lib/libpthread/pthread_cond.c
diff -u src/lib/libpthread/pthread_cond.c:1.59 src/lib/libpthread/pthread_cond.c:1.60
--- src/lib/libpthread/pthread_cond.c:1.59 Thu Mar 21 12:49:12 2013
+++ src/lib/libpthread/pthread_cond.c Thu Mar 28 14:07:12 2013
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread_cond.c,v 1.59 2013/03/21 16:49:12 christos Exp $ */
+/* $NetBSD: pthread_cond.c,v 1.60 2013/03/28 18:07:12 christos Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -46,7 +46,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_cond.c,v 1.59 2013/03/21 16:49:12 christos Exp $");
+__RCSID("$NetBSD: pthread_cond.c,v 1.60 2013/03/28 18:07:12 christos Exp $");
#include <stdlib.h>
#include <errno.h>
@@ -75,6 +75,13 @@ __strong_alias(__libc_cond_wait,pthread_
__strong_alias(__libc_cond_timedwait,pthread_cond_timedwait)
__strong_alias(__libc_cond_destroy,pthread_cond_destroy)
+static clockid_t
+pthread_cond_getclock(const pthread_cond_t *cond)
+{
+ return cond->ptc_private ?
+ *(clockid_t *)cond->ptc_private : CLOCK_REALTIME;
+}
+
int
pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
{
@@ -135,6 +142,19 @@ pthread_cond_timedwait(pthread_cond_t *c
pthread__error(EPERM, "Mutex not locked in condition wait",
mutex->ptm_owner != NULL);
if (abstime != NULL) {
+ /*
+ * XXX: This should be done in the kernel to avoid
+ * extra system calls!
+ */
+ if (pthread_cond_getclock(cond) == CLOCK_MONOTONIC) {
+ struct timespec mono, real;
+ if (clock_gettime(CLOCK_REALTIME, &real) == -1 ||
+ clock_gettime(CLOCK_MONOTONIC, &mono) == -1)
+ return errno;
+ timespecsub(abstime, &mono, &mono);
+ timespecadd(&mono, &real, &mono);
+ abstime = &mono;
+ }
pthread__error(EINVAL, "Invalid wait time",
(abstime->tv_sec >= 0) &&
(abstime->tv_nsec >= 0) &&
@@ -390,8 +410,7 @@ pthread_cond_wait_nothread(pthread_t sel
diff.tv_sec = 99999999;
diff.tv_nsec = 0;
} else {
- clockid_t clck = cond->ptc_private ?
- *(clockid_t *)cond->ptc_private : CLOCK_REALTIME;
+ clockid_t clck = pthread_cond_getclock(cond);
clock_gettime(clck, &now);
if (timespeccmp(abstime, &now, <))
timespecclear(&diff);
