1 files changed, 119 insertions, 0 deletions
diff --git a/pthreads/pthread_mutex_unlock.c b/pthreads/pthread_mutex_unlock.c
new file mode 100644
index 000000000..9ebe4e378
--- /dev/null
+++ b/pthreads/pthread_mutex_unlock.c
@@ -0,0 +1,119 @@
+/*
+ * pthread_mutex_unlock.c
+ *
+ * Description:
+ * This translation unit implements mutual exclusion (mutex) 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 "pthread.h"
+#include "implement.h"
+
+
+int
+pthread_mutex_unlock (pthread_mutex_t * mutex)
+{
+  int result = 0;
+  pthread_mutex_t mx;
+
+  /*
+   * Let the system deal with invalid pointers.
+   */
+
+  mx = *mutex;
+
+  /*
+   * If the thread calling us holds the mutex then there is no
+   * race condition. If another thread holds the
+   * lock then we shouldn't be in here.
+   */
+  if (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+    {
+      if (mx->kind == PTHREAD_MUTEX_NORMAL)
+	{
+	  LONG idx;
+
+	  idx = (LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
+						   (LONG) 0);
+	  if (idx != 0)
+	    {
+	      if (idx < 0)
+		{
+		  /*
+		   * Someone may be waiting on that mutex.
+		   */
+		  if (SetEvent (mx->event) == 0)
+		    {
+		      result = EINVAL;
+		    }
+		}
+	    }
+	  else
+	    {
+	      /*
+	       * Was not locked (so can't be owned by us).
+	       */
+	      result = EPERM;
+	    }
+	}
+      else
+	{
+	  if (pthread_equal (mx->ownerThread, pthread_self ()))
+	    {
+	      if (mx->kind != PTHREAD_MUTEX_RECURSIVE
+		  || 0 == --mx->recursive_count)
+		{
+		  mx->ownerThread.p = NULL;
+
+		  if ((LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
+							 (LONG) 0) < 0)
+		    {
+		      /* Someone may be waiting on that mutex */
+		      if (SetEvent (mx->event) == 0)
+			{
+			  result = EINVAL;
+			}
+		    }
+		}
+	    }
+	  else
+	    {
+	      result = EPERM;
+	    }
+	}
+    }
+  else
+    {
+      result = EINVAL;
+    }
+
+  return (result);
+}