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123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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#include "pthreadP.h"
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#include "atomic.h"
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#ifdef IS_IN_librt
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/* XXX Hack ahead. In librt we currently do not have access to a
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function equivalent to __pthread_unwind. Therefore we just raise a
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signal. */
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void
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attribute_hidden
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__pthread_unwind (__pthread_unwind_buf_t *buf)
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{
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INTERNAL_SYSCALL_DECL (err);
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while (1)
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INTERNAL_SYSCALL (tkill, err, 2, THREAD_GETMEM (THREAD_SELF, tid),
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SIGCANCEL);
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}
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/* The next two functions are similar to pthread_setcanceltype() but
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more specialized for the use in the cancelable functions like write().
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They do not need to check parameters etc. */
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int
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attribute_hidden
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__librt_enable_asynccancel (void)
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{
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struct pthread *self = THREAD_SELF;
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int oldval = THREAD_GETMEM (self, cancelhandling);
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while (1)
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{
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int newval = oldval | CANCELTYPE_BITMASK;
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if (__builtin_expect ((oldval & CANCELED_BITMASK) != 0, 0))
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{
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/* If we are already exiting stop right here. */
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if ((oldval & EXITING_BITMASK) != 0)
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break;
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int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
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newval, oldval);
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if (__builtin_expect (curval != oldval, 0))
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{
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/* Somebody else modified the word, try again. */
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oldval = curval;
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continue;
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}
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THREAD_SETMEM (self, result, PTHREAD_CANCELED);
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__do_cancel ();
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/* NOTREACHED */
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}
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int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
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oldval);
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if (__builtin_expect (curval == oldval, 1))
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break;
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/* Prepare the next round. */
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oldval = curval;
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}
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return oldval;
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}
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void
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internal_function attribute_hidden
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__librt_disable_asynccancel (int oldtype)
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{
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/* If asynchronous cancellation was enabled before we do not have
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anything to do. */
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if (oldtype & CANCELTYPE_BITMASK)
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return;
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struct pthread *self = THREAD_SELF;
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int oldval = THREAD_GETMEM (self, cancelhandling);
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while (1)
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{
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int newval = oldval & ~CANCELTYPE_BITMASK;
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if (newval == oldval)
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break;
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int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
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oldval);
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if (__builtin_expect (curval == oldval, 1))
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break;
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/* Prepare the next round. */
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oldval = curval;
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}
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}
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#endif
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