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diff --git a/libgomp/testsuite/libgomp.c/critical-1.c b/libgomp/testsuite/libgomp.c/critical-1.c
new file mode 100644
index 00000000..2b8503be
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/critical-1.c
@@ -0,0 +1,39 @@
+/* Trivial test of critical sections.  */
+
+/* { dg-require-effective-target sync_int_long } */
+
+#include <omp.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <assert.h>
+#include "libgomp_g.h"
+
+
+static volatile int test = -1;
+
+static void function(void *dummy)
+{
+  int iam = omp_get_thread_num ();
+  int old;
+
+  GOMP_critical_start ();
+
+  old = __sync_lock_test_and_set (&test, iam);
+  assert (old == -1);
+
+  usleep (10);
+  test = -1;
+
+  GOMP_critical_end ();
+}
+
+int main()
+{
+  omp_set_dynamic (0);
+
+  GOMP_parallel_start (function, NULL, 3);
+  function (NULL);
+  GOMP_parallel_end ();
+
+  return 0;
+}