From a416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 18 Feb 2002 03:16:52 +0000
Subject: Major reorganisation of source code; new routine and tests added.

---
 pthread_mutex_unlock.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 pthread_mutex_unlock.c

(limited to 'pthread_mutex_unlock.c')

diff --git a/pthread_mutex_unlock.c b/pthread_mutex_unlock.c
new file mode 100644
index 0000000..0c1ea5f
--- /dev/null
+++ b/pthread_mutex_unlock.c
@@ -0,0 +1,93 @@
+/*
+ * 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) 1999,2002 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@ise.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;
+
+  if (mutex == NULL || *mutex == NULL)
+    {
+      return EINVAL;
+    }
+
+  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_MUTEX_INITIALIZER)
+    {
+      if (mx->ownerThread == (pthread_t) PTW32_MUTEX_OWNER_ANONYMOUS
+	  || pthread_equal(mx->ownerThread, pthread_self()))
+	{
+	  if( mx->kind != PTHREAD_MUTEX_RECURSIVE_NP
+	      || 0 == --mx->recursive_count )
+	    {
+	      mx->ownerThread = NULL;
+	      EnterCriticalSection( &mx->wait_cs );
+
+	      if( InterlockedDecrement( &mx->lock_idx ) >= 0 )
+		{
+		  /* Someone is waiting on that mutex */
+		  if (sem_post( &mx->wait_sema ) != 0)
+		    {
+		      result = errno;
+		    }
+		}
+
+	      LeaveCriticalSection( &mx->wait_cs );
+	    }
+	}
+      else
+	{
+	  result = EPERM;
+	}
+    }
+  else
+    {
+      result = EINVAL;
+    }
+
+  return(result);
+}
-- 
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