ref: 66c22f3908ca79fce85b6d65d749ea1a88d59d16
dir: /sys/src/libc/9sys/privalloc.c/
#include <u.h>
#include <libc.h>
static Lock privlock;
extern void **_privates;
extern int _nprivates;
void **
privalloc(void)
{
void **p;
lock(&privlock);
if(_nprivates > 0)
p = &_privates[--_nprivates];
else
p = nil;
unlock(&privlock);
return p;
}