1 files changed, 122 insertions, 0 deletions
diff --git a/pthread_rwlockattr_setpshared.c b/pthread_rwlockattr_setpshared.c
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+++ b/pthread_rwlockattr_setpshared.c
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+/*
+ * pthread_rwlockattr_setpshared.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) 1999,2002 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 <errno.h>
+#include <limits.h>
+
+#include "pthread.h"
+#include "implement.h"
+
+int
+pthread_rwlockattr_setpshared (pthread_rwlockattr_t * attr,
+			      int pshared)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      Rwlocks created with 'attr' can be shared between
+      *      processes if pthread_rwlock_t variable is allocated
+      *      in memory shared by these processes.
+      *
+      * PARAMETERS
+      *      attr
+      * 	     pointer to an instance of pthread_rwlockattr_t
+      *
+      *      pshared
+      * 	     must be one of:
+      *
+      * 		     PTHREAD_PROCESS_SHARED
+      * 			     May be shared if in shared memory
+      *
+      * 		     PTHREAD_PROCESS_PRIVATE
+      * 			     Cannot be shared.
+      *
+      * DESCRIPTION
+      *      Rwlocks creatd with 'attr' can be shared between
+      *      processes if pthread_rwlock_t variable is allocated
+      *      in memory shared by these processes.
+      *
+      *      NOTES:
+      * 	     1)      pshared rwlocks MUST be allocated in shared
+      * 		     memory.
+      *
+      * 	     2)      The following macro is defined if shared rwlocks
+      * 		     are supported:
+      * 			     _POSIX_THREAD_PROCESS_SHARED
+      *
+      * RESULTS
+      * 	     0		     successfully set attribute,
+      * 	     EINVAL	     'attr' or pshared is invalid,
+      * 	     ENOSYS	     PTHREAD_PROCESS_SHARED not supported,
+      *
+      * ------------------------------------------------------
+      */
+{
+  int result;
+
+  if ((attr != NULL && *attr != NULL) &&
+      ((pshared == PTHREAD_PROCESS_SHARED) ||
+       (pshared == PTHREAD_PROCESS_PRIVATE)))
+    {
+      if (pshared == PTHREAD_PROCESS_SHARED)
+	{
+
+#if !defined( _POSIX_THREAD_PROCESS_SHARED )
+
+	  result = ENOSYS;
+	  pshared = PTHREAD_PROCESS_PRIVATE;
+
+#else
+
+	  result = 0;
+
+#endif /* _POSIX_THREAD_PROCESS_SHARED */
+
+	}
+      else
+	{
+	  result = 0;
+	}
+
+      (*attr)->pshared = pshared;
+    }
+  else
+    {
+      result = EINVAL;
+    }
+
+  return (result);
+
+}				/* pthread_rwlockattr_setpshared */