glibc/sysdeps/generic/stdio-lock.h

/* Thread package specific definitions of stream lock type.  Generic version.
   Copyright (C) 2000-2017 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
   <http://www.gnu.org/licenses/>.  */

#ifndef _STDIO_LOCK_H
#define _STDIO_LOCK_H 1

#include <libc-lock.h>

__libc_lock_define_recursive (typedef, _IO_lock_t)

/* We need recursive (counting) mutexes.  */
#ifdef _LIBC_LOCK_RECURSIVE_INITIALIZER
# define _IO_lock_initializer _LIBC_LOCK_RECURSIVE_INITIALIZER
#elif _IO_MTSAFE_IO
 #error libio needs recursive mutexes for _IO_MTSAFE_IO
#endif

#define _IO_lock_init(_name)	__libc_lock_init_recursive (_name)
#define _IO_lock_fini(_name)	__libc_lock_fini_recursive (_name)
#define _IO_lock_lock(_name)	__libc_lock_lock_recursive (_name)
#define _IO_lock_trylock(_name)	__libc_lock_trylock_recursive (_name)
#define _IO_lock_unlock(_name)	__libc_lock_unlock_recursive (_name)


#define _IO_cleanup_region_start(_fct, _fp) \
  __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
#define _IO_cleanup_region_start_noarg(_fct) \
  __libc_cleanup_region_start (1, _fct, NULL)
#define _IO_cleanup_region_end(_doit) \
  __libc_cleanup_region_end (_doit)

#if defined _LIBC && IS_IN (libc)

# ifdef __EXCEPTIONS
# define _IO_acquire_lock(_fp) \
  do {									      \
    _IO_FILE *_IO_acquire_lock_file					      \
	__attribute__((cleanup (_IO_acquire_lock_fct)))			      \
	= (_fp);							      \
    _IO_flockfile (_IO_acquire_lock_file);
#  define _IO_acquire_lock_clear_flags2(_fp) \
  do {									      \
    _IO_FILE *_IO_acquire_lock_file					      \
	__attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct)))	      \
	= (_fp);							      \
    _IO_flockfile (_IO_acquire_lock_file);
# else
#  define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
#  define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp)
# endif
# define _IO_release_lock(_fp) ; } while (0)

#endif

#endif /* stdio-lock.h */