PTHREAD_CLEANUP(3) BSD Library Functions Manual PTHREAD_CLEANUP(3)
pthread_cleanup_push, pthread_cleanup_pop -- add and remove cleanup functions for thread exit
POSIX Threads Library (libpthread, -lpthread)
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
The pthread_cleanup_pop() function pops the top cleanup routine off of the current threads cleanup routine stack, and, if execute is non-
zero, it will execute the function.
When cleanup_routine is called, it is passed arg as its only argument.
These functions may be implemented as macros which contain scope delimiters; therefore, there must be a matching pthread_cleanup_pop() for
every pthread_cleanup_push() at the same level of lexical scoping.
The effect of calling longjmp() or siglongjmp() is undefined after a call to pthread_cleanup_push() but before the matching call to
pthread_cleanup_pop() after the jump buffer was filled.
Neither pthread_cleanup_push() nor pthread_cleanup_pop() returns a value.
Both functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
July 9, 2010 BSD