--- /dev/null
+// commit: e5dd18319bbd47c89aac5e1571771958a43e067d 2011-03-08
+// pthread_rwlock_try* should fail with EBUSY
+#include <pthread.h>
+#include <errno.h>
+#include <string.h>
+#include "test.h"
+
+#define T(f) if ((r=(f))) t_error(#f " failed: %s\n", strerror(r))
+
+static void *tryrdlock(void *arg)
+{
+ int r = pthread_rwlock_tryrdlock(arg);
+ if (r != EBUSY)
+ t_error("tryrdlock for wrlocked lock returned %s, want EBUSY\n", strerror(errno));
+ return 0;
+}
+
+static void *trywrlock(void *arg)
+{
+ int r = pthread_rwlock_trywrlock(arg);
+ if (r != EBUSY)
+ t_error("trywrlock for rdlocked lock returned %s, want EBUSY\n", strerror(errno));
+ return 0;
+}
+
+int main(void)
+{
+ pthread_t t;
+ pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
+ void *p;
+ int r;
+
+ T(pthread_rwlock_rdlock(&rw));
+ T(pthread_create(&t, 0, trywrlock, &rw));
+ T(pthread_join(t, &p));
+ T(pthread_rwlock_unlock(&rw));
+
+ T(pthread_rwlock_wrlock(&rw));
+ T(pthread_create(&t, 0, tryrdlock, &rw));
+ T(pthread_join(t, &p));
+ T(pthread_rwlock_unlock(&rw));
+
+ return t_status;
+}