pthread_cleanup_push

#define pthread_cleanup_push(func, val) \

{ \

struct __darwin_pthread_handler_rec __handler; \

pthread_t __self = pthread_self(); \

__handler.__routine = func; \

__handler.__arg = val; \

__handler.__next = __self->__cleanup_stack; \

__self->__cleanup_stack = &__handler;

#define pthread_cleanup_pop(execute) \

/* Note: 'handler' must be in this same lexical context! */ \

__self->__cleanup_stack = __handler.__next; \

if (execute) (__handler.__routine)(__handler.__arg); \

}