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


       #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():


       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 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

       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);


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


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


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