From 047d67ab257600533bc3a1047a2a54d287dcc2d2 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 15 Nov 2006 14:08:49 +0000
Subject: 2006-11-15	Joel Sherrill <joel.sherrill@oarcorp.com>

	* libcsupport/src/termios.c, posix/Makefile.am, posix/preinstall.am,
	posix/include/rtems/posix/config.h, posix/include/rtems/posix/time.h,
	sapi/src/posixapi.c, score/Makefile.am, score/preinstall.am,
	score/include/rtems/score/corerwlock.h,
	score/include/rtems/score/threadq.h,
	score/src/corerwlockobtainread.c, score/src/threadqenqueue.c,
	score/src/threadqtimeout.c: Adding POSIX barriers, POSIX spinlocks,
	and partial implementation of POSIX rwlocks.
	* posix/include/rtems/posix/barrier.h,
	posix/include/rtems/posix/rwlock.h,
	posix/include/rtems/posix/spinlock.h,
	posix/inline/rtems/posix/barrier.inl,
	posix/inline/rtems/posix/rwlock.inl,
	posix/inline/rtems/posix/spinlock.inl,
	posix/src/barrierattrdestroy.c, posix/src/barrierattrgetpshared.c,
	posix/src/barrierattrinit.c, posix/src/barrierattrsetpshared.c,
	posix/src/pbarrier.c, posix/src/pbarrierdestroy.c,
	posix/src/pbarrierinit.c, posix/src/pbarriertranslatereturncode.c,
	posix/src/pbarrierwait.c, posix/src/prwlock.c,
	posix/src/prwlockdestroy.c, posix/src/prwlockinit.c,
	posix/src/prwlockrdlock.c, posix/src/prwlocktimedrdlock.c,
	posix/src/prwlocktimedwrlock.c,
	posix/src/prwlocktranslatereturncode.c, posix/src/prwlocktryrdlock.c,
	posix/src/prwlocktrywrlock.c, posix/src/prwlockunlock.c,
	posix/src/prwlockwrlock.c, posix/src/pspin.c,
	posix/src/pspindestroy.c, posix/src/pspininit.c,
	posix/src/pspinlock.c, posix/src/pspinlocktranslatereturncode.c,
	posix/src/pspintrylock.c, posix/src/pspinunlock.c,
	posix/src/rwlockattrdestroy.c, posix/src/rwlockattrgetpshared.c,
	posix/src/rwlockattrinit.c, posix/src/rwlockattrsetpshared.c: New files.
---
 cpukit/posix/src/prwlocktrywrlock.c | 71 +++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 cpukit/posix/src/prwlocktrywrlock.c

(limited to 'cpukit/posix/src/prwlocktrywrlock.c')

diff --git a/cpukit/posix/src/prwlocktrywrlock.c b/cpukit/posix/src/prwlocktrywrlock.c
new file mode 100644
index 0000000000..861a448447
--- /dev/null
+++ b/cpukit/posix/src/prwlocktrywrlock.c
@@ -0,0 +1,71 @@
+/*
+ *  POSIX RWLock Manager -- Attempt to Obtain a Write Lock on a RWLock Instance
+ *
+ *  COPYRIGHT (c) 1989-2006.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <pthread.h>
+#include <errno.h>
+
+#include <rtems/system.h>
+#include <rtems/posix/rwlock.h>
+
+/*
+ *  pthread_rwlock_trywrlock
+ *
+ *  This directive attempts to obtain a Write only lock on an rwlock instance.
+ *
+ *  Input parameters:
+ *    rwlock          - pointer to rwlock id
+ *
+ *  Output parameters:
+ *    0          - if successful
+ *    error code - if unsuccessful
+ */
+
+int pthread_rwlock_trywrlock(
+  pthread_rwlock_t  *rwlock
+)
+{
+  POSIX_RWLock_Control  *the_rwlock;
+  Objects_Locations      location;
+  
+  if ( !rwlock )
+    return EINVAL;
+
+  the_rwlock = _POSIX_RWLock_Get( rwlock, &location );
+  switch ( location ) {
+
+    case OBJECTS_REMOTE:
+    case OBJECTS_ERROR:
+      return EINVAL;
+
+    case OBJECTS_LOCAL:
+
+      _CORE_RWLock_Obtain_for_writing(
+	&the_rwlock->RWLock,
+	*rwlock,
+	FALSE,                 // we are not willing to wait
+	0,
+	NULL
+      );
+
+      _Thread_Enable_dispatch();
+      return _POSIX_RWLock_Translate_core_RWLock_return_code(
+        (CORE_RWLock_Status) _Thread_Executing->Wait.return_code
+      );
+  }
+
+  return POSIX_BOTTOM_REACHED();
+}
-- 
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