wait_for_completion.h

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/* PROLOG END TAG zYx                                              */
#ifndef _SPU_WAIT_FOR_COMPLETION_H_
#define _SPU_WAIT_FOR_COMPLETION_H_

#include "sync_utils.h"
#include <spu_mfcio.h>
#include "sync_irq.h"
#include "completion.h"

/* _wait_for_completion 
 *    Internal routine to wait for completion to
 *    become true (!0).  When completion is false,
 *    uses lock line reservation lost event to 
 *    sleep until the variable has been changed.
 */
static __inline void _wait_for_completion(completion_ea_t completion)
{
    DECL_COMPLETION_VARS();
    s32 status;

    status = 1;

    ea64.ull = ALIGN128_EA(completion);
    offset = OFFSET128_EA_U32(completion);
    do {
        MFC_DMA(buf, ea64, size, tagid, MFC_GETLLAR_CMD);
        spu_readch(MFC_RdAtomicStat);
        /* if the completion variable has been set elsewhere
         * (a signal or broadcast function has been called 
         * then we get out of the loop, and reset the variable */
        if (likely(buf[offset] != 0)) {
            /* decrement the variable */
            buf[offset]--;
            MFC_DMA(buf, ea64, size, tagid, MFC_PUTLLC_CMD);
            spu_readch(MFC_RdAtomicStat);
            status = 0;
        }
    } while (status != 0);
}



#endif /* _SPU_WAIT_FOR_COMPLETION_H_ */