pthread_cleanup_pop Syntax

void pthread_cleanup_pop(int execute);

#include <pthread.h>

/* pop the "func" out of cleanup stack and execute "func" */
pthread_cleanup_pop (1);

/* pop the "func" and DONT execute "func" */
pthread_cleanup_pop (0); 

A nonzero argument in the pop function removes the handler from the stack and executes the handler. An argument of zero pops the handler without executing the handler.

pthread_cleanup_pop() is effectively called with a nonzero argument when a thread either explicitly or implicitly calls pthread_exit() or when the thread accepts a cancel request.