pthread_cleanup_push_defer_Library Functions Mpthread_cleanup_push_defer_np(3)
NAME
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np - push
and pop thread cancelation clean-up handlers while saving cancelability
type
LIBRARY
POSIX threads library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
void pthread_cleanup_push_defer_np(void (*routine)(void *), void *arg);
void pthread_cleanup_pop_restore_np(int execute);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
pthread_cleanup_push_defer_np(), pthread_cleanup_pop_defer_np():
_GNU_SOURCE
DESCRIPTION
These functions are the same as pthread_cleanup_push(3) and
pthread_cleanup_pop(3), except for the differences noted on this page.
Like pthread_cleanup_push(3), pthread_cleanup_push_defer_np() pushes
routine onto the thread's stack of cancelation clean-up handlers. In
addition, it also saves the thread's current cancelability type, and
sets the cancelability type to "deferred" (see pthread_setcancel-
type(3)); this ensures that cancelation clean-up will occur even if the
thread's cancelability type was "asynchronous" before the call.
Like pthread_cleanup_pop(3), pthread_cleanup_pop_restore_np() pops the
top-most clean-up handler from the thread's stack of cancelation clean-
up handlers. In addition, it restores the thread's cancelability type
to its value at the time of the matching pthread_cleanup_push_de-
fer_np().
The caller must ensure that calls to these functions are paired within
the same function, and at the same lexical nesting level. Other re-
strictions apply, as described in pthread_cleanup_push(3).
This sequence of calls:
pthread_cleanup_push_defer_np(routine, arg);
pthread_cleanup_pop_restore_np(execute);
is equivalent to (but shorter and more efficient than):
int oldtype;
pthread_cleanup_push(routine, arg);
pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
...
pthread_setcanceltype(oldtype, NULL);
pthread_cleanup_pop(execute);
STANDARDS
These functions are nonstandard GNU extensions; hence the suffix "_np"
(nonportable) in the names.
SEE ALSO
pthread_cancel(3), pthread_cleanup_push(3), pthread_setcancelstate(3),
pthread_testcancel(3), pthreads(7)
Linux man-pages 6.03 2022-10-30 pthread_cleanup_push_defer_np(3)
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