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/* (C)Copyright 2001,2007,                                         */
/* International Business Machines Corporation,                    */
/* Sony Computer Entertainment, Incorporated,                      */
/* Toshiba Corporation,                                            */
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/* PROLOG END TAG zYx                                              */
#ifndef _SPU_COND_SIGNAL_H_
#define _SPU_COND_SIGNAL_H_
#include <stdio.h>
#include "sync_utils.h"
#include "cond.h"
#include "atomic.h"
#include <spu_mfcio.h>

/*
 * _cond_signal: signalling any of the waiting threads to wake up.
 */ 
static __inline void _cond_signal(cond_ea_t cond)
{
    char _tmp[256];                                     
    char *tmp = (char *) ALIGN(_tmp, 128);              
    volatile unsigned short *buf = (volatile unsigned short *) &tmp[0];       
    unsigned int size = 128, tagid = 0;                          
    u32 offset;                                         
    addr64 ea64;                                      
    int status;

    ea64.ull = ALIGN128_EA(cond);
    offset = OFFSET128_EA_U16(cond);

    do {
      MFC_DMA(buf, ea64, size, tagid, MFC_GETLLAR_CMD);
      (void)spu_readch(MFC_RdAtomicStat);

      /* Check for waiting threads.
       */
      if (buf[offset] != buf[offset+1]) {
	/* Increment the signaled count to release the next waiting
	 * thread.
	 */
	buf[offset]++;

	MFC_DMA(buf, ea64, size, tagid, MFC_PUTLLC_CMD);
	status = spu_readch(MFC_RdAtomicStat);
      } else {
	/* Nobody is waiting, do nothing.
	 */
	status = 0;
      }
    } while (status);
}


#endif /* _SPU_COND_SIGNAL_H_ */