1 files changed, 143 insertions, 0 deletions
diff --git a/libpthread/tests/test-11.c b/libpthread/tests/test-11.c
new file mode 100644
index 00000000..de779a40
--- /dev/null
+++ b/libpthread/tests/test-11.c
@@ -0,0 +1,143 @@
+/* Test rwlocks.  */
+
+#define _GNU_SOURCE
+
+#include <pthread.h>
+#include <assert.h>
+#include <error.h>
+#include <errno.h>
+
+#define THREADS 1
+
+int a;
+int b;
+
+/* Get a read lock and assert that a == b.  */
+void *
+test1 (void *arg)
+{
+  error_t err;
+  pthread_rwlock_t *lock = arg;
+  int i;
+
+  for (i = 0; i < 200; i ++)
+    {
+      err = pthread_rwlock_rdlock (lock);
+      assert (err == 0);
+
+      assert (a == b);
+
+      sched_yield ();
+
+      assert (a == b);
+
+      err = pthread_rwlock_unlock (lock);
+      assert (err == 0);
+    }
+
+  return 0;
+}
+
+int
+main (int argc, char **argv)
+{
+  error_t err;
+  pthread_rwlockattr_t attr;
+  pthread_rwlock_t lock;
+  int pshared;
+
+  int i;
+  pthread_t tid[THREADS];
+  void *ret;
+
+  err = pthread_rwlockattr_init (&attr);
+  if (err)
+    error (1, err, "pthread_rwlockattr_init");
+
+  err = pthread_rwlockattr_getpshared (&attr, &pshared);
+  if (err)
+    error (1, err, "pthread_rwlockattr_getpshared");
+
+  /* Assert the default state as mandated by POSIX.  */
+  assert (pshared == PTHREAD_PROCESS_PRIVATE);
+
+  err = pthread_rwlockattr_setpshared (&attr, pshared);
+  if (err)
+    error (1, err, "pthread_rwlockattr_setpshared");
+
+  err = pthread_rwlock_init (&lock, &attr);
+  if (err)
+    error (1, err, "pthread_rwlock_init");
+
+  err = pthread_rwlockattr_destroy (&attr);
+  if (err)
+    error (1, err, "pthread_rwlockattr_destroy");
+
+  /* Now test the lock.  */
+
+  for (i = 0; i < THREADS; i ++)
+    {
+      err = pthread_create (&tid[i], 0, test1, &lock);
+      if (err)
+	error (1, err, "pthread_create");
+    }
+
+  for (i = 0; i < 10; i ++)
+    {
+      sched_yield ();
+
+      /* Get a write lock.  */
+      pthread_rwlock_wrlock (&lock);
+      /* Increment a and b giving other threads a chance to run in
+	 between.  */
+      sched_yield ();
+      a ++;
+      sched_yield ();
+      b ++;
+      sched_yield ();
+      /* Unlock.  */
+      pthread_rwlock_unlock (&lock);
+    }
+
+  for (i = 0; i < THREADS; i ++)
+    {
+      err = pthread_join (tid[i], &ret);
+      if (err)
+	error (1, err, "pthread_join");
+    }
+
+  /* Read lock it.  */
+  err = pthread_rwlock_tryrdlock (&lock);
+  assert (err == 0);
+  
+  /* Try to write lock it.  It should fail with EBUSY.  */
+  err = pthread_rwlock_trywrlock (&lock);
+  assert (err == EBUSY);
+  
+  /* Drop the read lock.  */
+  err = pthread_rwlock_unlock (&lock);
+  assert (err == 0);
+
+  /* Get a write lock.  */
+  err = pthread_rwlock_trywrlock (&lock);
+  assert (err == 0);
+
+  /* Fail trying to acquire another write lock.  */
+  err = pthread_rwlock_trywrlock (&lock);
+  assert (err == EBUSY);
+
+  /* Try to get a read lock which should also fail.  */
+  err = pthread_rwlock_tryrdlock (&lock);
+  assert (err == EBUSY);
+
+  /* Unlock it.  */
+  err = pthread_rwlock_unlock (&lock);
+  assert (err == 0);
+
+
+  err = pthread_rwlock_destroy (&lock);
+  if (err)
+    error (1, err, "pthread_rwlock_destroy");
+
+  return 0;
+}