Test for error checking mutex.

1 files changed, 157 insertions, 0 deletions

diff --git a/linuxthreads/ecmutex.c b/linuxthreads/ecmutex.c
new file mode 100644
index 0000000..b9d1d54
--- /dev/null
+++ b/linuxthreads/ecmutex.c
@@ -0,0 +1,157 @@
+/* Test of the error checking mutex and incidently also barriers.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+static pthread_mutex_t locks[] =
+{
+  PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,
+  PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,
+  PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,
+  PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP,
+  PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
+};
+#define nlocks (sizeof (locks) / sizeof (locks[0]))
+
+static pthread_barrier_t barrier;
+#define SYNC pthread_barrier_wait (&barrier)
+
+#define NTHREADS nlocks
+
+#define ROUNDS 20
+
+
+static void *
+worker (void *arg)
+{
+  /* We are locking the and unlocked the locks and check the errors.
+     Since we are using the error-checking variant the implementation
+     should report them.  */
+  int nr = (int) arg;
+  int i;
+  void *result = NULL;
+  int retval;
+
+  for (i = 0; i < ROUNDS; ++i)
+    {
+      /* Skip the rounds which would make other == own.  */
+      if (i % nlocks == 0)
+	continue;
+
+      /* Get the "own" mutex.  */
+      if (pthread_mutex_trylock (&locks[nr]) != 0)
+	{
+	  printf ("thread %d failed getting own mutex\n", nr);
+	  result = (void *) 1;
+	}
+
+      /* Try locking "own" mutex again.  */
+      retval = pthread_mutex_lock (&locks[nr]);
+      if (retval != EDEADLK)
+	{
+	  printf ("thread %d failed getting own mutex\n", nr);
+	  result = (void *) 1;
+	}
+
+      /* Try to get a different semaphore.  */
+      SYNC;
+      retval = pthread_mutex_trylock (&locks[(nr + i) % nlocks]);
+      if (retval != EBUSY)
+	{
+	  printf ("thread %d didn't deadlock on getting %d's lock\n",
+		  nr, (nr + i) % nlocks);
+	  result = (void *) 1;
+	}
+
+      /* Try unlocking other's lock.  */
+      retval = pthread_mutex_unlock (&locks[(nr + i) % nlocks]);
+      if (retval != EPERM)
+	{
+	  printf ("thread %d managed releasing mutex %d\n",
+		  nr, (nr + i) % nlocks);
+	  result = (void *) 1;
+	}
+
+      /* All lock one mutex now.  */
+      SYNC;
+      retval = pthread_mutex_lock (&locks[i % nlocks]);
+      if (nr == (i % nlocks))
+	{
+	  if (retval != EDEADLK)
+	    {
+	      printf ("thread %d didn't deadlock on getting %d's lock\n",
+		      nr, (nr + i) % nlocks);
+	      result = (void *) 1;
+	    }
+	  if (pthread_mutex_unlock (&locks[i % nlocks]) != 0)
+	    {
+	      printf ("thread %d failed releasing own mutex\n", nr);
+	      result = (void *) 1;
+	    }
+	}
+      else
+	{
+	  if (retval != 0)
+	    {
+	      printf ("thread %d failed acquiring mutex %d\n",
+		      nr, i % nlocks);
+	      result = (void *) 1;
+	    }
+	  else if (pthread_mutex_unlock (&locks[i % nlocks]) != 0)
+	    {
+	      printf ("thread %d failed releasing mutex %d\n",
+		      nr, i % nlocks);
+	      result = (void *) 1;
+	    }
+	}
+
+      /* Unlock the own lock.  */
+      SYNC;
+      if (nr != (i % nlocks) && pthread_mutex_unlock (&locks[nr]) != 0)
+	{
+	  printf ("thread %d failed releasing own mutex\n", nr);
+	  result = (void *) 1;
+	}
+
+      /* Try unlocking again.  */
+      retval = pthread_mutex_unlock (&locks[nr]);
+      if (retval == 0)
+	{
+	  printf ("thread %d managed releasing own mutex twice\n", nr);
+	  result = (void *) 1;
+	}
+    }
+
+  return result;
+}
+
+
+#define TEST_FUNCTION do_test ()
+int
+do_test (void)
+{
+  pthread_t threads[NTHREADS];
+  int i;
+  void *res;
+  int result = 0;
+
+  pthread_barrier_init (&barrier, NULL, NTHREADS);
+
+  for (i = 0; i < NTHREADS; ++i)
+    if (pthread_create (&threads[i], NULL, worker, (void *) i) != 0)
+      {
+	printf ("failed to create thread %d: %m\n", i);
+	exit (1);
+      }
+
+  for (i = 0; i < NTHREADS; ++i)
+    if (pthread_join (threads[i], &res) != 0 || res != NULL)
+      result = 1;
+
+  return result;
+}
+
+#include "../test-skeleton.c"