| PTHREAD_CLEANUP_PUSH_DEFER_NP(Linux Programmer's ManuPTHREAD_CLEANUP_PUSH_DEFER_NP(3) | NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | SEE ALSO | COLOPHON | The Linux Programming Interface |
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.
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 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);
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)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2008-12-04 PTHREAD_CLEANUP_PUSH_DEFER_NP(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface