X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gcell%2Fibm%2Fsync%2Fspu_source%2Fread_trylock.h;fp=gcell%2Fibm%2Fsync%2Fspu_source%2Fread_trylock.h;h=d0327835141d1ebd121bc9883f58c4d45aa4b16d;hb=ea29b08aeb54227e6628f655ccfdb96fe4d8c378;hp=0000000000000000000000000000000000000000;hpb=09a1e803a9e6587c78d20cdf16891e5295874668;p=debian%2Fgnuradio

diff --git a/gcell/ibm/sync/spu_source/read_trylock.h b/gcell/ibm/sync/spu_source/read_trylock.h
new file mode 100644
index 00000000..d0327835
--- /dev/null
+++ b/gcell/ibm/sync/spu_source/read_trylock.h
@@ -0,0 +1,71 @@
+/* --------------------------------------------------------------  */
+/* (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 _SPU_READ_TRYLOCK_H_
+#define _SPU_READ_TRYLOCK_H_
+
+#include "sync_utils.h"
+#include "mutex.h"
+
+/**
+ * read_trylock - acquire a reader lock, or return immediately.
+ * @ea: handle to effective address of lock variable.
+ *
+ * Acquire a non-exclusive reader lock, or return
+ * immediately.  The only restriction here is that
+ * @ea must be word aligned.
+ *
+ * Returns 1 on success, or 0 on failure.
+ *
+ * Context: The application should not call this interface 
+ * from a tight loop!!  Use read_lock() instead.
+ */
+static __inline int _read_trylock(eaddr_t ea)
+{
+    DECL_MUTEX_VARS();
+    s32 status, ret_val;
+
+    RAW_TEST_AND_SET(>=, 1);
+
+    return ret_val;
+}
+
+
+#endif /* _SPU_READ_TRYLOCK_H_ */