1 files changed, 83 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_cond_destroy.c b/libpthread/nptl/pthread_cond_destroy.c
new file mode 100644
index 000000000..b67b53506
--- /dev/null
+++ b/libpthread/nptl/pthread_cond_destroy.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include "pthreadP.h"
+
+
+int
+__pthread_cond_destroy (
+     pthread_cond_t *cond)
+{
+  int pshared = (cond->__data.__mutex == (void *) ~0l)
+		? LLL_SHARED : LLL_PRIVATE;
+
+  /* Make sure we are alone.  */
+  lll_lock (cond->__data.__lock, pshared);
+
+  if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
+    {
+      /* If there are still some waiters which have not been
+	 woken up, this is an application bug.  */
+      lll_unlock (cond->__data.__lock, pshared);
+      return EBUSY;
+    }
+
+  /* Tell pthread_cond_*wait that this condvar is being destroyed.  */
+  cond->__data.__total_seq = -1ULL;
+
+  /* If there are waiters which have been already signalled or
+     broadcasted, but still are using the pthread_cond_t structure,
+     pthread_cond_destroy needs to wait for them.  */
+  unsigned int nwaiters = cond->__data.__nwaiters;
+
+  if (nwaiters >= (1 << COND_NWAITERS_SHIFT))
+    {
+      /* Wake everybody on the associated mutex in case there are
+         threads that have been requeued to it.
+         Without this, pthread_cond_destroy could block potentially
+         for a long time or forever, as it would depend on other
+         thread's using the mutex.
+         When all threads waiting on the mutex are woken up, pthread_cond_wait
+         only waits for threads to acquire and release the internal
+         condvar lock.  */
+      if (cond->__data.__mutex != NULL
+	  && cond->__data.__mutex != (void *) ~0l)
+	{
+	  pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
+	  lll_futex_wake (&mut->__data.__lock, INT_MAX,
+			  PTHREAD_MUTEX_PSHARED (mut));
+	}
+
+      do
+	{
+	  lll_unlock (cond->__data.__lock, pshared);
+
+	  lll_futex_wait (&cond->__data.__nwaiters, nwaiters, pshared);
+
+	  lll_lock (cond->__data.__lock, pshared);
+
+	  nwaiters = cond->__data.__nwaiters;
+	}
+      while (nwaiters >= (1 << COND_NWAITERS_SHIFT));
+    }
+
+  return 0;
+}
+weak_alias(__pthread_cond_destroy, pthread_cond_destroy)