1 files changed, 94 insertions, 0 deletions
diff --git a/pthreads/pthread_rwlock_unlock.c b/pthreads/pthread_rwlock_unlock.c
new file mode 100644
index 000000000..776c996fe
--- /dev/null
+++ b/pthreads/pthread_rwlock_unlock.c
@@ -0,0 +1,94 @@
+/*
+ * pthread_rwlock_unlock.c
+ *
+ * Description:
+ * This translation unit implements read/write lock primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This 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 of the License, or (at your option) any later version.
+ * 
+ *      This 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 this library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <errno.h>
+#include <limits.h>
+
+#include "pthread.h"
+#include "implement.h"
+
+int
+pthread_rwlock_unlock (pthread_rwlock_t * rwlock)
+{
+  int result, result1;
+  pthread_rwlock_t rwl;
+
+  if (rwlock == NULL || *rwlock == NULL)
+    {
+      return (EINVAL);
+    }
+
+  if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
+    {
+      /*
+       * Assume any race condition here is harmless.
+       */
+      return 0;
+    }
+
+  rwl = *rwlock;
+
+  if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
+    {
+      return EINVAL;
+    }
+
+  if (rwl->nExclusiveAccessCount == 0)
+    {
+      if ((result =
+	   pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
+	{
+	  return result;
+	}
+
+      if (++rwl->nCompletedSharedAccessCount == 0)
+	{
+	  result = pthread_cond_signal (&(rwl->cndSharedAccessCompleted));
+	}
+
+      result1 = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
+    }
+  else
+    {
+      rwl->nExclusiveAccessCount--;
+
+      result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
+      result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
+
+    }
+
+  return ((result != 0) ? result : result1);
+}