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#include <u.h>
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#include <libc.h>
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#define	NFN	33
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static	int	(*onnot[NFN])(void*, char*);
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static	Lock	onnotlock;
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static
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void
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notifier(void *v, char *s)
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{
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	int i;
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	for(i=0; i<NFN; i++)
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		if(onnot[i] && ((*onnot[i])(v, s))){
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			noted(NCONT);
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			return;
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		}
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	noted(NDFLT);
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}
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int
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atnotify(int (*f)(void*, char*), int in)
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{
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	int i, n, ret;
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	static int init;
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	if(!init){
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		notify(notifier);
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		init = 1;		/* assign = */
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	}
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	ret = 0;
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	lock(&onnotlock);
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	if(in){
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		for(i=0; i<NFN; i++)
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			if(onnot[i] == 0) {
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				onnot[i] = f;
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				ret = 1;
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				break;
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			}
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	}else{
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		n = 0;
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		for(i=0; i<NFN; i++)
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			if(onnot[i]){
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				if(ret==0 && onnot[i]==f){
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					onnot[i] = 0;
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					ret = 1;
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				}else
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					n++;
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			}
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		if(n == 0){
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			init = 0;
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			notify(0);
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		}
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	}
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	unlock(&onnotlock);
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	return ret;
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}