cvs update pthreads

1 files changed, 135 insertions, 118 deletions

diff --git a/pthreads/ptw32_semwait.c b/pthreads/ptw32_semwait.c
index 8b23d11d6..e97784977 100644
--- a/pthreads/ptw32_semwait.c
+++ b/pthreads/ptw32_semwait.c
@@ -1,118 +1,135 @@
-/*
- * ptw32_semwait.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
- */
-
-#ifndef _UWIN
-//#   include <process.h>
-#endif
-#include "pthread.h"
-#include "implement.h"
-
-
-int
-ptw32_semwait (sem_t * sem)
-     /*
-      * ------------------------------------------------------
-      * DESCRIPTION
-      *      This function waits on a POSIX semaphore. If the
-      *      semaphore value is greater than zero, it decreases
-      *      its value by one. If the semaphore value is zero, then
-      *      the calling thread (or process) is blocked until it can
-      *      successfully decrease the value.
-      *
-      *      Unlike sem_wait(), this routine is non-cancelable.
-      *
-      * RESULTS
-      *              0               successfully decreased semaphore,
-      *              -1              failed, error in errno.
-      * ERRNO
-      *              EINVAL          'sem' is not a valid semaphore,
-      *              ENOSYS          semaphores are not supported,
-      *              EINTR           the function was interrupted by a signal,
-      *              EDEADLK         a deadlock condition was detected.
-      *
-      * ------------------------------------------------------
-      */
-{
-  int result = 0;
-  sem_t s = *sem;
-
-  if (s == NULL)
-    {
-      result = EINVAL;
-    }
-  else
-    {
-      if ((result = pthread_mutex_lock (&s->lock)) == 0)
-        {
-          int v = --s->value;
-
-          (void) pthread_mutex_unlock (&s->lock);
-
-          if (v < 0)
-            {
-              /* Must wait */
-              if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0)
-		{
-#ifdef NEED_SEM
-		  if (pthread_mutex_lock (&s->lock) == 0)
-		    {
-		      if (s->leftToUnblock > 0)
-			{
-			  --s->leftToUnblock;
-			  SetEvent(s->sem);
-			}
-		      (void) pthread_mutex_unlock (&s->lock);
-		    }
-#endif
-		  return 0;
-		}
-            }
-          else
-	    {
-	      return 0;
-	    }
-        }
-    }
-
-  if (result != 0)
-    {
-      errno = result;
-      return -1;
-    }
-
-  return 0;
-
-}				/* ptw32_semwait */
+/*

+ * ptw32_semwait.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

+ */

+

+#ifndef _UWIN

+/*#   include <process.h> */

+#endif

+#include "pthread.h"

+#include "implement.h"

+

+

+int

+ptw32_semwait (sem_t * sem)

+     /*

+      * ------------------------------------------------------

+      * DESCRIPTION

+      *      This function waits on a POSIX semaphore. If the

+      *      semaphore value is greater than zero, it decreases

+      *      its value by one. If the semaphore value is zero, then

+      *      the calling thread (or process) is blocked until it can

+      *      successfully decrease the value.

+      *

+      *      Unlike sem_wait(), this routine is non-cancelable.

+      *

+      * RESULTS

+      *              0               successfully decreased semaphore,

+      *              -1              failed, error in errno.

+      * ERRNO

+      *              EINVAL          'sem' is not a valid semaphore,

+      *              ENOSYS          semaphores are not supported,

+      *              EINTR           the function was interrupted by a signal,

+      *              EDEADLK         a deadlock condition was detected.

+      *

+      * ------------------------------------------------------

+      */

+{

+  int result = 0;

+  sem_t s = *sem;

+

+  if (s == NULL)

+    {

+      result = EINVAL;

+    }

+  else

+    {

+      if ((result = pthread_mutex_lock (&s->lock)) == 0)

+        {

+          int v;

+

+	  /* See sem_destroy.c

+	   */

+	  if (*sem == NULL)

+	    {

+	      (void) pthread_mutex_unlock (&s->lock);

+	      errno = EINVAL;

+	      return -1;

+	    }

+

+          v = --s->value;

+          (void) pthread_mutex_unlock (&s->lock);

+

+          if (v < 0)

+            {

+              /* Must wait */

+              if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0)

+		{

+#ifdef NEED_SEM

+		  if (pthread_mutex_lock (&s->lock) == 0)

+		    {

+        	      if (*sem == NULL)

+        	        {

+        	          (void) pthread_mutex_unlock (&s->lock);

+        	          errno = EINVAL;

+        	          return -1;

+        	        }

+

+		      if (s->leftToUnblock > 0)

+			{

+			  --s->leftToUnblock;

+			  SetEvent(s->sem);

+			}

+		      (void) pthread_mutex_unlock (&s->lock);

+		    }

+#endif

+		  return 0;

+		}

+            }

+          else

+	    {

+	      return 0;

+	    }

+        }

+    }

+

+  if (result != 0)

+    {

+      errno = result;

+      return -1;

+    }

+

+  return 0;

+

+}				/* ptw32_semwait */