Eliminate a race condition in timed waits (cv, mutex, and sleeps).

MFC Candidate.

PR:	93592

3 files changed, 30 insertions, 30 deletions

diff --git a/lib/libpthread/thread/thr_cond.c b/lib/libpthread/thread/thr_cond.c
index cd719d4..a50a690 100644
--- a/lib/libpthread/thread/thr_cond.c
+++ b/lib/libpthread/thread/thr_cond.c
@@ -421,11 +421,6 @@ _pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
 				/* Return invalid argument error: */
 				rval = EINVAL;
 			} else {
-				/* Set the wakeup time: */
-				curthread->wakeup_time.tv_sec = abstime->tv_sec;
-				curthread->wakeup_time.tv_nsec =
-				    abstime->tv_nsec;
-
 				/* Reset the timeout and interrupted flags: */
 				curthread->timeout = 0;
 				curthread->interrupted = 0;
@@ -464,6 +459,11 @@ _pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
 					 * set the state.
 					 */
 					THR_SCHED_LOCK(curthread, curthread);
+					/* Set the wakeup time: */
+					curthread->wakeup_time.tv_sec =
+					    abstime->tv_sec;
+					curthread->wakeup_time.tv_nsec =
+					    abstime->tv_nsec;
 					THR_SET_STATE(curthread, PS_COND_WAIT);
 
 					/* Remember the CV: */
diff --git a/lib/libpthread/thread/thr_mutex.c b/lib/libpthread/thread/thr_mutex.c
index e095ac5..0f56069 100644
--- a/lib/libpthread/thread/thr_mutex.c
+++ b/lib/libpthread/thread/thr_mutex.c
@@ -551,14 +551,6 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 				/* Unlock the mutex structure: */
 				THR_LOCK_RELEASE(curthread, &(*m)->m_lock);
 			} else {
-				/* Set the wakeup time: */
-				if (abstime) {
-					curthread->wakeup_time.tv_sec =
-						abstime->tv_sec;
-					curthread->wakeup_time.tv_nsec =
-						abstime->tv_nsec;
-				}
-
 				/*
 				 * Join the queue of threads waiting to lock
 				 * the mutex and save a pointer to the mutex.
@@ -572,6 +564,14 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 				 * be able to safely set the state.
 				 */
 				THR_SCHED_LOCK(curthread, curthread);
+				/* Set the wakeup time: */
+				if (abstime) {
+					curthread->wakeup_time.tv_sec =
+						abstime->tv_sec;
+					curthread->wakeup_time.tv_nsec =
+						abstime->tv_nsec;
+				}
+
 				THR_SET_STATE(curthread, PS_MUTEX_WAIT);
 				THR_SCHED_UNLOCK(curthread, curthread);
 
@@ -633,14 +633,6 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 				/* Unlock the mutex structure: */
 				THR_LOCK_RELEASE(curthread, &(*m)->m_lock);
 			} else {
-				/* Set the wakeup time: */
-				if (abstime) {
-					curthread->wakeup_time.tv_sec =
-						abstime->tv_sec;
-					curthread->wakeup_time.tv_nsec =
-						abstime->tv_nsec;
-				}
-
 				/*
 				 * Join the queue of threads waiting to lock
 				 * the mutex and save a pointer to the mutex.
@@ -659,6 +651,13 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 					mutex_priority_adjust(curthread, *m);
 
 				THR_SCHED_LOCK(curthread, curthread);
+				/* Set the wakeup time: */
+				if (abstime) {
+					curthread->wakeup_time.tv_sec =
+						abstime->tv_sec;
+					curthread->wakeup_time.tv_nsec =
+						abstime->tv_nsec;
+				}
 				THR_SET_STATE(curthread, PS_MUTEX_WAIT);
 				THR_SCHED_UNLOCK(curthread, curthread);
 
@@ -730,14 +729,6 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 				/* Unlock the mutex structure: */
 				THR_LOCK_RELEASE(curthread, &(*m)->m_lock);
 			} else {
-				/* Set the wakeup time: */
-				if (abstime) {
-					curthread->wakeup_time.tv_sec =
-						abstime->tv_sec;
-					curthread->wakeup_time.tv_nsec =
-						abstime->tv_nsec;
-				}
-
 				/*
 				 * Join the queue of threads waiting to lock
 				 * the mutex and save a pointer to the mutex.
@@ -756,6 +747,13 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *m,
 				 */
 
 				THR_SCHED_LOCK(curthread, curthread);
+				/* Set the wakeup time: */
+				if (abstime) {
+					curthread->wakeup_time.tv_sec =
+						abstime->tv_sec;
+					curthread->wakeup_time.tv_nsec =
+						abstime->tv_nsec;
+				}
 				THR_SET_STATE(curthread, PS_MUTEX_WAIT);
 				THR_SCHED_UNLOCK(curthread, curthread);
 
diff --git a/lib/libpthread/thread/thr_nanosleep.c b/lib/libpthread/thread/thr_nanosleep.c
index e8baa84..5eba37d 100644
--- a/lib/libpthread/thread/thr_nanosleep.c
+++ b/lib/libpthread/thread/thr_nanosleep.c
@@ -46,6 +46,7 @@ _nanosleep(const struct timespec *time_to_sleep,
 	int             ret = 0;
 	struct timespec ts, ts1;
 	struct timespec remaining_time;
+	struct timespec wakeup_time;
 
 	/* Check if the time to sleep is legal: */
 	if ((time_to_sleep == NULL) || (time_to_sleep->tv_sec < 0) ||
@@ -61,10 +62,11 @@ _nanosleep(const struct timespec *time_to_sleep,
 		KSE_GET_TOD(curthread->kse, &ts);
 
 		/* Calculate the time for the current thread to wake up: */
-		TIMESPEC_ADD(&curthread->wakeup_time, &ts, time_to_sleep);
+		TIMESPEC_ADD(&wakeup_time, &ts, time_to_sleep);
 
 		THR_LOCK_SWITCH(curthread);
 		curthread->interrupted = 0;
+		curthread->wakeup_time = wakeup_time;
 		THR_SET_STATE(curthread, PS_SLEEP_WAIT);
 
 		/* Reschedule the current thread to sleep: */