plan9port/src/lib9/priv.c

#include <u.h>
#include <libc.h>
#include "9proc.h"

static Lock privlock;
static ulong privmap;

int
privalloc(void)
{
	int i;

	lock(&privlock);
	for(i=0; i<NPRIV; i++)
		if((privmap&(1<<i)) == 0){
			privmap |= (1<<i);
			unlock(&privlock);
			return i;
		}
	unlock(&privlock);
	return -1;
}

void**
privmem(int i)
{
	Uproc *up;

	up = _p9uproc();
	return &up->priv[i];
}