wait_for_completion.h

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#ifndef _PPU_WAIT_FOR_COMPLETION_H_
#define _PPU_WAIT_FOR_COMPLETION_H_

#include <ppu_intrinsics.h>
#include "sync_utils.h"
#include "completion.h"


/**
 * completion_wait - wait until a completion is broadcast.
 * @comp: handle to effective address of completion variable.
 *
 * Description: Wait until another processor or device signals
 * that a completionition is 'true'.  The only restriction here is 
 * that @comp must be a word aligned address.
 *
 * Beware: This function hot polls waiting for completion.
 */
static __inline void _wait_for_completion(completion_ea_t comp)
{
  int val;
  void *p;

  SYNC_ULL_TO_PTR(comp, p);

  do {
    val = (int)__lwarx(p);
    if (val != 1) val = (int)__stwcx(p, (unsigned int)0);
  } while (val == 0);
  __isync();
}


#endif /* _PPU_WAIT_FOR_COMPLETION_H_ */