Push a Handler Onto the Stack

Use cleanup handlers to restore conditions to a state consistent with that at the point of origin, such as cleaning up allocated resources and restoring invariants. Use the pthread_cleanup_push(3T) and pthread_cleanup_pop(3T) functions to manage the handlers.

Cleanup handlers are pushed and popped in the same lexical scope of a program. They should always match; otherwise compiler errors will be generated.

pthread_cleanup_push(3T)

Use the pthread_cleanup_push() function to push a cleanup handler onto a cleanup stack (LIFO).

Prototype:

void pthread_cleanup_push(void(*routine)(void *), void *args);

#include <pthread.h>

/* push the handler "routine" on cleanup stack */
pthread_cleanup_push (routine, arg);