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PTHREAD_CLEANUP_PUSH(3) Library Functions Manual PTHREAD_CLEANUP_PUSH(3)

pthread_cleanup_push
add a cleanup function for thread exit

#include <pthread.h>
void
pthread_cleanup_push(void (*cleanup_routine)(void *), void *arg);

The pthread_cleanup_push() function adds cleanup_routine to the top of the stack of cleanup handlers that get called when the current thread exits.
When cleanup_routine is called, it is passed arg as its only argument.

pthread_cleanup_push() does not return any value.

None

pthread_cleanup_pop(3), pthread_exit(3)

pthread_cleanup_push() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
June 5, 2013 OpenBSD-current