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da63009e0f
* Makefile (tests): Add tst-cleanup1. * tst-cleanup1.c: New file. * cancellation.c (__cleanup_thread): Removed. (__do_cancel): Remove call to __cleanup_thread. * pthreadP.h: Remove __cleanup_thread prorotype.
114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/* Copyright (C) 2002 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 <stdlib.h>
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#include "pthreadP.h"
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#include "atomic.h"
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/* This function is responsible for calling all registered cleanup
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handlers and then terminate the thread. This includes dellocating
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the thread-specific data. The implementation is complicated by the
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fact that we have to handle to cancellation handler registration
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methods: exceptions using try/finally and setjmp.
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The setjmp method is always available. The user might compile some
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code which uses this method because no modern compiler is
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available. So we have to handle these first since we cannot call
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the cleanup handlers if the stack frames are gone. At the same
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time this opens a hole for the register exception handler blocks
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since now they might be in danger of using an overwritten stack
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frame. The advise is to only use new or only old style cancellation
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handling. */
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void
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__do_cancel (char *currentframe)
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{
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struct pthread *self = THREAD_SELF;
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/* Throw an exception. */
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// XXX TBI
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/* If throwing an exception didn't work try the longjmp. */
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__libc_longjmp (self->cancelbuf, 1);
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/* NOTREACHED */
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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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__pthread_enable_asynccancel (void)
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{
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struct pthread *self = THREAD_SELF;
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int oldval;
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while (1)
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{
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oldval = THREAD_GETMEM (self, cancelhandling);
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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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if (atomic_compare_and_exchange_acq (&self->cancelhandling, newval,
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oldval) == 0)
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{
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if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval))
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{
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THREAD_SETMEM (self, result, PTHREAD_CANCELED);
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__do_cancel (CURRENT_STACK_FRAME);
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}
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break;
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}
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}
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return oldval;
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}
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void
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attribute_hidden
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__pthread_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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while (1)
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{
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int oldval = THREAD_GETMEM (self, cancelhandling);
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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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if (atomic_compare_and_exchange_acq (&self->cancelhandling, newval,
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oldval) == 0)
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break;
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}
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}
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