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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_ */
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