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-rw-r--r--lib/libpthread/test/mutex_d.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/libpthread/test/mutex_d.c b/lib/libpthread/test/mutex_d.c
index 45d28a5..801d779 100644
--- a/lib/libpthread/test/mutex_d.c
+++ b/lib/libpthread/test/mutex_d.c
@@ -1455,6 +1455,9 @@ int main (int argc, char *argv[])
act.sa_flags = SA_RESTART;
sigaction (SIGINT, &act, NULL);
+ /* This test relies on the concurrency level being 1. */
+ pthread_setconcurrency(1);
+
/*
* Initialize the thread attribute.
*/
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