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#include <u.h>
#include <libc.h>
extern void (*_onexit)(void);
typedef struct Onex Onex;
struct Onex{
void (*f)(void);
int pid;
};
static Lock onexlock;
static Onex onex[33];
static void
onexit(void)
{
int i, pid;
void (*f)(void);
pid = getpid();
for(i = nelem(onex)-1; i >= 0; i--)
if((f = onex[i].f) != nil && onex[i].pid == pid) {
onex[i].f = nil;
(*f)();
}
}
int
atexit(void (*f)(void))
{
int i;
_onexit = onexit;
lock(&onexlock);
for(i=0; i<nelem(onex); i++)
if(onex[i].f == nil) {
onex[i].pid = getpid();
onex[i].f = f;
unlock(&onexlock);
return 1;
}
unlock(&onexlock);
return 0;
}
void
atexitdont(void (*f)(void))
{
int i, pid;
pid = getpid();
for(i=0; i<nelem(onex); i++)
if(onex[i].f == f && onex[i].pid == pid)
onex[i].f = nil;
}
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