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.

1 files changed, 60 insertions, 0 deletions

diff --git a/cpukit/posix/src/pspintrylock.c b/cpukit/posix/src/pspintrylock.c
new file mode 100644
index 0000000000..a77b0e2b21
--- /dev/null
+++ b/cpukit/posix/src/pspintrylock.c
@@ -0,0 +1,60 @@
+/*
+ *  POSIX Spinlock Manager -- Wait at a Spinlock
+ *
+ *  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/spinlock.h>
+
+/*
+ *  pthread_spin_trylock
+ *
+ *  This directive allows a thread to poll an attempt at locking a spinlock.
+ *
+ *  Input parameters:
+ *    spinlock    - spinlock id
+ *
+ *  Output parameters:
+ *    0          - if successful
+ *    error code - if unsuccessful
+ */
+
+int pthread_spin_trylock(
+  pthread_spinlock_t *spinlock
+)
+{
+  POSIX_Spinlock_Control  *the_spinlock = NULL;
+  Objects_Locations        location;
+  CORE_spinlock_Status     status;
+
+  if ( !spinlock )
+    return EINVAL;
+
+  the_spinlock = _POSIX_Spinlock_Get( spinlock, &location );
+  switch ( location ) {
+    case OBJECTS_REMOTE:
+    case OBJECTS_ERROR:
+      return EINVAL;
+
+    case OBJECTS_LOCAL:
+      status = _CORE_spinlock_Wait( &the_spinlock->Spinlock, FALSE, 0 );
+      _Thread_Enable_dispatch();
+      return _POSIX_Spinlock_Translate_core_spinlock_return_code( status );
+  }
+  return POSIX_BOTTOM_REACHED();
+}