pthread_cleanup_pop_restore_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  cancela‚Äź
       bility 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 feature_test_macros(7)):

       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

       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 pthread_cleanup_push(3).

       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 5.08 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                            2017-09-15 PTHREAD_CLEANUP_PUSH_DEFER_NP(3)