Merged eb/gcell-wip2 rev 10130:10152 into trunk.

[debian/gnuradio] / gcell / ibm / sync / ppu_source / mutex_trylock.h

diff --git a/gcell/ibm/sync/ppu_source/mutex_trylock.h b/gcell/ibm/sync/ppu_source/mutex_trylock.h
new file mode 100644 (file)
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--- /dev/null
+++ b/gcell/ibm/sync/ppu_source/mutex_trylock.h
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+/* --------------------------------------------------------------  */
+/* (C)Copyright 2001,2007,                                         */
+/* International Business Machines Corporation,                    */
+/* Sony Computer Entertainment, Incorporated,                      */
+/* Toshiba Corporation,                                            */
+/*                                                                 */
+/* All Rights Reserved.                                            */
+/*                                                                 */
+/* Redistribution and use in source and binary forms, with or      */
+/* without modification, are permitted provided that the           */
+/* following conditions are met:                                   */
+/*                                                                 */
+/* - Redistributions of source code must retain the above copyright*/
+/*   notice, this list of conditions and the following disclaimer. */
+/*                                                                 */
+/* - Redistributions in binary form must reproduce the above       */
+/*   copyright notice, this list of conditions and the following   */
+/*   disclaimer in the documentation and/or other materials        */
+/*   provided with the distribution.                               */
+/*                                                                 */
+/* - Neither the name of IBM Corporation nor the names of its      */
+/*   contributors may be used to endorse or promote products       */
+/*   derived from this software without specific prior written     */
+/*   permission.                                                   */
+/*                                                                 */
+/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND          */
+/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,     */
+/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF        */
+/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE        */
+/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR            */
+/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,    */
+/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT    */
+/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;    */
+/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)        */
+/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN       */
+/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR    */
+/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  */
+/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              */
+/* --------------------------------------------------------------  */
+/* PROLOG END TAG zYx                                              */
+#ifndef _PPU_MUTEX_TRYLOCK_H_
+#define _PPU_MUTEX_TRYLOCK_H_
+
+#include <ppu_intrinsics.h>
+#include "sync_utils.h"
+#include "mutex.h"
+#include "trace_libsync.h"
+
+/**
+ * mutex_trylock - acquire a lock, or return immediately.
+ * @lock: handle to effective address of lock variable.
+ *
+ * Description: Acquire a lock, or return immediately 
+ * without polling for availability.
+ *
+ * Context: The application should not call this interface 
+ * from a tight loop!!  Use spin_lock() instead.
+ *
+ * Attempt to immediately aquire a lock at a location in system memory,
+ * and return 1 if the lock was aquired or 0 otherwise.
+ */
+static __inline int _mutex_trylock (mutex_ea_t lock)
+{
+  int val;
+  int ret = 0;
+  void *p;
+
+  SYNC_ULL_TO_PTR(lock, p);
+
+  do {
+    val = (int)__lwarx(p);
+    if (val) break;
+  } while ((ret = __stwcx(p, (unsigned int)1)) == 0);
+  __isync();
+
+  TRACE_MUTEX_TRYLOCK(lock,ret);
+
+  return (ret);
+}
+
+#endif /* _PPU_MUTEX_TRYLOCK_H_ */