#include <Cocoa/Cocoa.h>
#define SECONDS 4
@interface Foo : NSObject {
        @public
        unsigned val;
}
- (void)increment;
@end
@implementation Foo : NSObject
- (void)increment {
        val++;
}
@end
Foo* gFoo;
void signal_handler(int signal) {
        printf("%d\n", gFoo->val / SECONDS);
        exit(0);
}
int main(void) {
        Foo* foo = [[Foo alloc] init];
        gFoo = foo;
        signal(SIGALRM, signal_handler);
        alarm(SECONDS);
        for (;;) {
            [foo increment];
        }
        return 0;
}