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/* Copyright (C) 2002-2021 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, 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 = THREAD_GETMEM (self, cancelhandling);
/* Disable asynchronous cancellation for now. */
if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))
while (1)
{
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
cancelhandling
& ~CANCELTYPE_BITMASK,
cancelhandling);
if (__glibc_likely (curval == cancelhandling))
/* Successfully replaced the value. */
break;
/* Prepare for the next round. */
cancelhandling = curval;
}
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;
if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
&& ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
& CANCELTYPE_BITMASK) == 0)
{
while (1)
{
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
cancelhandling
| CANCELTYPE_BITMASK,
cancelhandling);
if (__glibc_likely (curval == cancelhandling))
/* Successfully replaced the value. */
break;
/* Prepare for the next round. */
cancelhandling = curval;
}
__pthread_testcancel ();
}
}
libc_hidden_def (__libc_cleanup_pop_restore)
|
