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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Copyright (C) 2002-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<https://www.gnu.org/licenses/>. */
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#include "pthreadP.h"
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#include <tls.h>
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#include <libc-lock.h>
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void
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__libc_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer)
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{
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struct pthread *self = THREAD_SELF;
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buffer->__prev = THREAD_GETMEM (self, cleanup);
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int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
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/* Disable asynchronous cancellation for now. */
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if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))
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{
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int newval;
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do
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{
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newval = cancelhandling & ~CANCELTYPE_BITMASK;
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}
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while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
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&cancelhandling,
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newval));
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}
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buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
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? PTHREAD_CANCEL_ASYNCHRONOUS
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: PTHREAD_CANCEL_DEFERRED);
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THREAD_SETMEM (self, cleanup, buffer);
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}
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libc_hidden_def (__libc_cleanup_push_defer)
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void
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__libc_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer)
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{
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struct pthread *self = THREAD_SELF;
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THREAD_SETMEM (self, cleanup, buffer->__prev);
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int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
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if (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED
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&& (cancelhandling & CANCELTYPE_BITMASK) == 0)
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{
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int newval;
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do
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{
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newval = cancelhandling | CANCELTYPE_BITMASK;
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}
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while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
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&cancelhandling, newval));
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if (cancel_enabled_and_canceled (cancelhandling))
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{
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self->result = PTHREAD_CANCELED;
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__do_cancel ();
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}
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}
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}
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libc_hidden_def (__libc_cleanup_pop_restore)
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