_PR_MD_SET_INTSOFF(0);
_PR_FAST_INTSON(is);
static void AsyncIOCompletion (ExtendedParamBlock *pbAsyncPtr){    _PRCPU *cpu = _PR_MD_CURRENT_CPU();	PRThread *thread = pbAsyncPtr->thread;    if (_PR_MD_GET_INTSOFF()) {        cpu->u.missed[cpu->where] |= _PR_MISSED_IO;        thread->md.missedIONotify = PR_TRUE;		return;    }    _PR_MD_SET_INTSOFF(1);	thread->md.osErrCode = noErr;	DoneWaitingOnThisThread(thread);    _PR_MD_SET_INTSOFF(0);}