push и pop обработчики очистки отмены потоков с сохранением типа отменяемости (push and pop thread cancellation clean-up handlers while saving cancelability type)
Имя (Name)
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np -
push and pop thread cancellation clean-up handlers while saving
cancelability type
Синопсис (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
Описание (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 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 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);
Стандарты (Conforming to)
These functions are nonstandard GNU extensions; hence the suffix
"_np" (nonportable) in the names.
Смотри также (See also)
pthread_cancel(3), pthread_cleanup_push(3),
pthread_setcancelstate(3), pthread_testcancel(3), pthreads(7)
