study_objc4/objc4-779.1/test/load-noobjc2.m

#include "test.h"

extern semaphore_t go;

OBJC_ROOT_CLASS 
@interface noobjc @end
@implementation noobjc
+(void)load 
{
    semaphore_signal(go);
    while (1) sleep(1);
}
@end