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

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

diff --git a/gcell/ibm/sync/ppu_source/cond_wait.h b/gcell/ibm/sync/ppu_source/cond_wait.h
new file mode 100644 (file)
index 0000000..ed5fbec
--- /dev/null
+++ b/gcell/ibm/sync/ppu_source/cond_wait.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_COND_WAIT_H_
+#define _PPU_COND_WAIT_H_
+
+#include <ppu_intrinsics.h>
+#include "sync_utils.h"
+#include "mutex_lock.h"
+#include "mutex_unlock.h"
+#include "cond.h"
+
+static __inline void _cond_wait (cond_ea_t cond, mutex_ea_t  mutex)
+{
+  int delta, cur_delta;
+  unsigned int val, cond_val, signaled_cnt;
+  void *p;
+
+
+  SYNC_ULL_TO_PTR(cond, p);
+
+  /* Atomically signal we have entered the condition wait by incrementing
+   * the waiting count.
+   */
+  do {
+    val = __lwarx(p);
+    val = (val & ~0xFFFF) | ((val+1) & 0xFFFF);
+  } while (__stwcx(p, val) == 0);
+
+
+  /* Release the lock
+   */
+  _mutex_unlock (mutex);
+
+  /* Determine the signal count needed for this 
+   * participant to be signaled.
+   */
+
+  signaled_cnt = val >> 16;
+  delta = (int)(val & 0xFFFF) - (int)signaled_cnt;
+  if (delta < 0) delta = -delta;
+
+  /* Wait until the signaled count reaches the count
+   * previously determined.
+   */
+  do {
+    cond_val = __lwarx(p);
+
+    cur_delta = (int)(cond_val >> 16) - signaled_cnt;
+    if (cur_delta < 0) cur_delta = -cur_delta;
+   
+  } while (cur_delta < delta);
+
+  /* Relock the mutex 
+   */
+  _mutex_lock (mutex);
+}
+
+#endif /* _PPU_COND_WAIT_H_ */