and pop thread cancellation clean-up handlers while saving cancelabil-
void pthread_cleanup_push_defer_np(void (*routine)(void *),
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_setcancel-
type(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 pthread_cleanup_push(3).
This sequence of calls:
is equivalent to (but shorter and more efficient than):
These functions are nonstandard GNU extensions; hence the suffix "_np"
(nonportable) in the names.
pthread_cancel(3), pthread_cleanup_push(3), pthread_setcancelstate(3),
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