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/* Single-thread optimization definitions. Linux version.
Copyright (C) 2017-2020 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/>. */
#ifndef _SYSDEP_CANCEL_H
#define _SYSDEP_CANCEL_H
#include <sysdep.h>
#include <tls.h>
#include <errno.h>
/* The two functions are in libc.so and not exported. */
extern int __libc_enable_asynccancel (void) attribute_hidden;
extern void __libc_disable_asynccancel (int oldtype) attribute_hidden;
/* The two functions are in librt.so and not exported. */
extern int __librt_enable_asynccancel (void) attribute_hidden;
extern void __librt_disable_asynccancel (int oldtype) attribute_hidden;
/* The two functions are in libpthread.so and not exported. */
extern int __pthread_enable_asynccancel (void) attribute_hidden;
extern void __pthread_disable_asynccancel (int oldtype) attribute_hidden;
/* Set cancellation mode to asynchronous. */
#define CANCEL_ASYNC() \
__pthread_enable_asynccancel ()
/* Reset to previous cancellation mode. */
#define CANCEL_RESET(oldtype) \
__pthread_disable_asynccancel (oldtype)
#if IS_IN (libc)
/* Same as CANCEL_ASYNC, but for use in libc.so. */
# define LIBC_CANCEL_ASYNC() \
__libc_enable_asynccancel ()
/* Same as CANCEL_RESET, but for use in libc.so. */
# define LIBC_CANCEL_RESET(oldtype) \
__libc_disable_asynccancel (oldtype)
#elif IS_IN (libpthread)
# define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
# define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
#elif IS_IN (librt)
# define LIBC_CANCEL_ASYNC() \
__librt_enable_asynccancel ()
# define LIBC_CANCEL_RESET(val) \
__librt_disable_asynccancel (val)
#else
# define LIBC_CANCEL_ASYNC() 0 /* Just a dummy value. */
# define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it. */
#endif
#endif
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