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