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-rw-r--r--sysdeps/generic/pt-mutex-unlock.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/generic/pt-mutex-unlock.c b/sysdeps/generic/pt-mutex-unlock.c
index a9872252..492dfcb5 100644
--- a/sysdeps/generic/pt-mutex-unlock.c
+++ b/sysdeps/generic/pt-mutex-unlock.c
@@ -78,6 +78,10 @@ __pthread_mutex_unlock (pthread_mutex_t *mutex)
wakeup = mutex->__queue;
__pthread_dequeue (wakeup);
+#ifndef NDEBUG
+ mutex->owner = wakeup;
+#endif
+
/* We do not unlock MUTEX->held: we are transferring the ownership
to the thread that we are waking up. */