pthread_cleanup_push_defer_np(3) — Linux manual page



NAME         top

       pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np -
       push and pop thread cancellation clean-up handlers while saving
       cancelability type

SYNOPSIS         top

       #include <pthread.h>

       void pthread_cleanup_push_defer_np(void (*routine)(void *), void *arg);
       void pthread_cleanup_pop_restore_np(int execute);

       Compile and link with -pthread.

   Feature Test Macro Requirements for glibc (see

       pthread_cleanup_push_defer_np(), pthread_cleanup_pop_defer_np():

DESCRIPTION         top

       These functions are the same as pthread_cleanup_push(3) and
       pthread_cleanup_pop(3), except for the differences noted on this

       Like pthread_cleanup_push(3), pthread_cleanup_push_defer_np()
       pushes routine onto the thread's stack of cancellation clean-up
       handlers.  In addition, it also saves the thread's current
       cancelability type, and sets the cancelability type to "deferred"
       (see pthread_setcanceltype(3)); this ensures that cancellation
       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
       cancellation clean-up handlers.  In addition, it restores the
       thread's cancelability type to its value at the time of the
       matching pthread_cleanup_push_defer_np().

       The caller must ensure that calls to these functions are paired
       within the same function, and at the same lexical nesting level.
       Other restrictions apply, as described in

       This sequence of calls:

           pthread_cleanup_push_defer_np(routine, arg);

       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);

CONFORMING TO         top

       These functions are nonstandard GNU extensions; hence the suffix
       "_np" (nonportable) in the names.

SEE ALSO         top

       pthread_cancel(3), pthread_cleanup_push(3),
       pthread_setcancelstate(3), pthread_testcancel(3), pthreads(7)

COLOPHON         top

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at

Linux                          2021-03-22PTHREAD_CLEANUP_PUSH_DEFER_NP(3)

Pages that refer to this page: pthread_cleanup_push(3)