Updated to latest CVS version of pthreads

1 files changed, 127 insertions, 122 deletions

diff --git a/pthreads/pthread_rwlock_trywrlock.c b/pthreads/pthread_rwlock_trywrlock.c
index 3c6fccaa1..f12df055f 100644
--- a/pthreads/pthread_rwlock_trywrlock.c
+++ b/pthreads/pthread_rwlock_trywrlock.c
@@ -1,122 +1,127 @@
-/*

- * pthread_rwlock_trywrlock.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 <limits.h>

-

-#include "pthread.h"

-#include "implement.h"

-

-int

-pthread_rwlock_trywrlock (pthread_rwlock_t * rwlock)

-{

-  int result, result1;

-  pthread_rwlock_t rwl;

-

-  if (rwlock == NULL || *rwlock == NULL)

-    {

-      return EINVAL;

-    }

-

-  /*

-   * We do a quick check to see if we need to do more work

-   * to initialise a static rwlock. We check

-   * again inside the guarded section of ptw32_rwlock_check_need_init()

-   * to avoid race conditions.

-   */

-  if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)

-    {

-      result = ptw32_rwlock_check_need_init (rwlock);

-

-      if (result != 0 && result != EBUSY)

-	{

-	  return result;

-	}

-    }

-

-  rwl = *rwlock;

-

-  if (rwl->nMagic != PTW32_RWLOCK_MAGIC)

-    {

-      return EINVAL;

-    }

-

-  if ((result = pthread_mutex_trylock (&(rwl->mtxExclusiveAccess))) != 0)

-    {

-      return result;

-    }

-

-  if ((result =

-       pthread_mutex_trylock (&(rwl->mtxSharedAccessCompleted))) != 0)

-    {

-      result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));

-      return ((result1 != 0) ? result1 : result);

-    }

-

-  if (rwl->nExclusiveAccessCount == 0)

-    {

-      if (rwl->nCompletedSharedAccessCount > 0)

-	{

-	  rwl->nSharedAccessCount -= rwl->nCompletedSharedAccessCount;

-	  rwl->nCompletedSharedAccessCount = 0;

-	}

-

-      if (rwl->nSharedAccessCount > 0)

-	{

-	  if ((result =

-	       pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted))) != 0)

-	    {

-	      (void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));

-	      return result;

-	    }

-

-	  if ((result =

-	       pthread_mutex_unlock (&(rwl->mtxExclusiveAccess))) == 0)

-	    {

-	      result = EBUSY;

-	    }

-	}

-      else

-	{

-	  rwl->nExclusiveAccessCount = 1;

-	}

-    }

-  else

-    {

-      result = EBUSY;

-    }

-

-  return result;

-}

+/*
+ * pthread_rwlock_trywrlock.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) 1999,2012 Pthreads-win32 contributors
+ *
+ *      Homepage1: http://sourceware.org/pthreads-win32/
+ *      Homepage2: http://sourceforge.net/projects/pthreads4w/
+ *
+ *      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
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <limits.h>
+
+#include "pthread.h"
+#include "implement.h"
+
+int
+pthread_rwlock_trywrlock (pthread_rwlock_t * rwlock)
+{
+  int result, result1;
+  pthread_rwlock_t rwl;
+
+  if (rwlock == NULL || *rwlock == NULL)
+    {
+      return EINVAL;
+    }
+
+  /*
+   * We do a quick check to see if we need to do more work
+   * to initialise a static rwlock. We check
+   * again inside the guarded section of ptw32_rwlock_check_need_init()
+   * to avoid race conditions.
+   */
+  if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
+    {
+      result = ptw32_rwlock_check_need_init (rwlock);
+
+      if (result != 0 && result != EBUSY)
+	{
+	  return result;
+	}
+    }
+
+  rwl = *rwlock;
+
+  if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
+    {
+      return EINVAL;
+    }
+
+  if ((result = pthread_mutex_trylock (&(rwl->mtxExclusiveAccess))) != 0)
+    {
+      return result;
+    }
+
+  if ((result =
+       pthread_mutex_trylock (&(rwl->mtxSharedAccessCompleted))) != 0)
+    {
+      result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
+      return ((result1 != 0) ? result1 : result);
+    }
+
+  if (rwl->nExclusiveAccessCount == 0)
+    {
+      if (rwl->nCompletedSharedAccessCount > 0)
+	{
+	  rwl->nSharedAccessCount -= rwl->nCompletedSharedAccessCount;
+	  rwl->nCompletedSharedAccessCount = 0;
+	}
+
+      if (rwl->nSharedAccessCount > 0)
+	{
+	  if ((result =
+	       pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted))) != 0)
+	    {
+	      (void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
+	      return result;
+	    }
+
+	  if ((result =
+	       pthread_mutex_unlock (&(rwl->mtxExclusiveAccess))) == 0)
+	    {
+	      result = EBUSY;
+	    }
+	}
+      else
+	{
+	  rwl->nExclusiveAccessCount = 1;
+	}
+    }
+  else
+    {
+      result = EBUSY;
+    }
+
+  return result;
+}