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'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
this ensures that cancellation clean-up will occur even if
the thread's cancelability type was "asynchronous" before the
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
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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Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
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