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- /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include <setjmp.h>
- #include <stdlib.h>
- #include "pthreadP.h"
- #include "atomic.h"
- #include <bits/libc-lock.h>
- #ifndef NOT_IN_libc
- /* The next two functions are similar to pthread_setcanceltype() but
- more specialized for the use in the cancelable functions like write().
- They do not need to check parameters etc. */
- int
- attribute_hidden
- __libc_enable_asynccancel (void)
- {
- struct pthread *self = THREAD_SELF;
- int oldval = THREAD_GETMEM (self, cancelhandling);
- while (1)
- {
- int newval = oldval | CANCELTYPE_BITMASK;
- if (__builtin_expect ((oldval & CANCELED_BITMASK) != 0, 0))
- {
- /* If we are already exiting or if PTHREAD_CANCEL_DISABLED,
- stop right here. */
- if ((oldval & (EXITING_BITMASK | CANCELSTATE_BITMASK)) != 0)
- break;
- int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
- newval, oldval);
- if (__builtin_expect (curval != oldval, 0))
- {
- /* Somebody else modified the word, try again. */
- oldval = curval;
- continue;
- }
- THREAD_SETMEM (self, result, PTHREAD_CANCELED);
- __do_cancel ();
- /* NOTREACHED */
- }
- int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
- oldval);
- if (__builtin_expect (curval == oldval, 1))
- break;
- /* Prepare the next round. */
- oldval = curval;
- }
- return oldval;
- }
- void
- internal_function attribute_hidden
- __libc_disable_asynccancel (int oldtype)
- {
- /* If asynchronous cancellation was enabled before we do not have
- anything to do. */
- if (oldtype & CANCELTYPE_BITMASK)
- return;
- struct pthread *self = THREAD_SELF;
- int oldval = THREAD_GETMEM (self, cancelhandling);
- while (1)
- {
- int newval = oldval & ~CANCELTYPE_BITMASK;
- if (newval == oldval)
- break;
- int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
- oldval);
- if (__builtin_expect (curval == oldval, 1))
- break;
- /* Prepare the next round. */
- oldval = curval;
- }
- }
- void
- __libc_cleanup_routine (struct __pthread_cleanup_frame *f)
- {
- if (f->__do_it)
- f->__cancel_routine (f->__cancel_arg);
- }
- #endif
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