Section (3) pthread_cleanup_push_defer_np
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np — push and pop thread cancellation clean-up handlers while saving cancelability type
Compile and link with
the thread_zsingle_quotesz_s stack of cancellation clean-up handlers. In
addition, it also saves the thread_zsingle_quotesz_s current cancelability
type, and sets the cancelability type to deferred (see
this ensures that cancellation clean-up will occur even if
the thread_zsingle_quotesz_s cancelability type was asynchronous before the
pthread_cleanup_pop_restore_np() pops the
top-most clean-up handler from the thread_zsingle_quotesz_s stack of
cancellation clean-up handlers. In addition, it restores the
thread_zsingle_quotesz_s cancelability type to its value at the time of the
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.
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