Manpage of PTHREAD_CLEANUP_PUSH_DEFER_NP

PTHREAD_CLEANUP_PUSH_DEFER_NP

Section: Linux Programmer's Manual (3)
Updated: 2014-05-28
Index
 

NAME

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

SYNOPSIS

#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():

_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 routineonto 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 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);
 

CONFORMING TO

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 16:30:12 GMT, December 12, 2016 Click Here!