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1/* Thread package specific definitions of stream lock type. Generic version.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _STDIO_LOCK_H
20#define _STDIO_LOCK_H 1
21
22#include <libc-lock.h>
23
24__libc_lock_define_recursive (typedef, _IO_lock_t)
25#define _IO_lock_t_defined 1
26
27/* We need recursive (counting) mutexes. */
28#ifdef _LIBC_LOCK_RECURSIVE_INITIALIZER
29# define _IO_lock_initializer _LIBC_LOCK_RECURSIVE_INITIALIZER
30#elif _IO_MTSAFE_IO
31 #error libio needs recursive mutexes for _IO_MTSAFE_IO
32#endif
33
34#define _IO_lock_init(_name) __libc_lock_init_recursive (_name)
35#define _IO_lock_fini(_name) __libc_lock_fini_recursive (_name)
36#define _IO_lock_lock(_name) __libc_lock_lock_recursive (_name)
37#define _IO_lock_trylock(_name) __libc_lock_trylock_recursive (_name)
38#define _IO_lock_unlock(_name) __libc_lock_unlock_recursive (_name)
39
40
41#define _IO_cleanup_region_start(_fct, _fp) \
42 __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
43#define _IO_cleanup_region_start_noarg(_fct) \
44 __libc_cleanup_region_start (1, _fct, NULL)
45#define _IO_cleanup_region_end(_doit) \
46 __libc_cleanup_region_end (_doit)
47
48#if defined _LIBC && IS_IN (libc)
49
50# ifdef __EXCEPTIONS
51# define _IO_acquire_lock(_fp) \
52 do { \
53 FILE *_IO_acquire_lock_file \
54 __attribute__((cleanup (_IO_acquire_lock_fct))) \
55 = (_fp); \
56 _IO_flockfile (_IO_acquire_lock_file);
57# else
58# define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
59# endif
60# define _IO_release_lock(_fp) ; } while (0)
61
62#endif
63
64#endif /* stdio-lock.h */
65

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source code of glibc/sysdeps/generic/stdio-lock.h