1PTHREAD_CLEANUP_PUSH_DEFER_NLPi(n3u)x Programmer's MPaTnHuRaElAD_CLEANUP_PUSH_DEFER_NP(3)
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NAME

6       pthread_cleanup_push_defer_np,  pthread_cleanup_pop_restore_np  -  push
7       and pop thread cancellation clean-up handlers while saving  cancelabil‐
8       ity type
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SYNOPSIS

11       #include <pthread.h>
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13       void pthread_cleanup_push_defer_np(void (*routine)(void *), void *arg);
14       void pthread_cleanup_pop_restore_np(int execute);
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16       Compile and link with -pthread.
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18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       pthread_cleanup_push_defer_np(), pthread_cleanup_pop_defer_np():
21           _GNU_SOURCE
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DESCRIPTION

24       These   functions   are   the   same   as  pthread_cleanup_push(3)  and
25       pthread_cleanup_pop(3), except for the differences noted on this page.
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27       Like  pthread_cleanup_push(3),  pthread_cleanup_push_defer_np()  pushes
28       routine  onto the thread's stack of cancellation clean-up handlers.  In
29       addition, it also saves the thread's current  cancelability  type,  and
30       sets  the  cancelability  type  to  "deferred"  (see pthread_setcancel‐
31       type(3)); this ensures that cancellation clean-up will  occur  even  if
32       the thread's cancelability type was "asynchronous" before the call.
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34       Like  pthread_cleanup_pop(3), pthread_cleanup_pop_restore_np() pops the
35       top-most clean-up handler  from  the  thread's  stack  of  cancellation
36       clean-up handlers.  In addition, it restores the thread's cancelability
37       type to its value at the time of the matching  pthread_cleanup_push_de‐
38       fer_np().
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40       The  caller must ensure that calls to these functions are paired within
41       the same function, and at the same lexical nesting  level.   Other  re‐
42       strictions apply, as described in pthread_cleanup_push(3).
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44       This sequence of calls:
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46           pthread_cleanup_push_defer_np(routine, arg);
47           pthread_cleanup_pop_restore_np(execute);
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49       is equivalent to (but shorter and more efficient than):
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51           int oldtype;
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53           pthread_cleanup_push(routine, arg);
54           pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
55           ...
56           pthread_setcanceltype(oldtype, NULL);
57           pthread_cleanup_pop(execute);
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CONFORMING TO

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

64       pthread_cancel(3), pthread_cleanup_push(3),  pthread_setcancelstate(3),
65       pthread_testcancel(3), pthreads(7)
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COLOPHON

68       This  page  is  part of release 5.13 of the Linux man-pages project.  A
69       description of the project, information about reporting bugs,  and  the
70       latest     version     of     this    page,    can    be    found    at
71       https://www.kernel.org/doc/man-pages/.
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75Linux                             2021-03-22  PTHREAD_CLEANUP_PUSH_DEFER_NP(3)
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