1 /* Thread package specific definitions of stream lock type. NPTL version.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #define _STDIO_LOCK_H 1
22 #include <libc-lock.h>
23 #include <lowlevellock.h>
26 typedef struct { int lock
; int cnt
; void *owner
; } _IO_lock_t
;
27 #define _IO_lock_t_defined 1
29 #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL }
31 #define _IO_lock_init(_name) \
32 ((void) ((_name) = (_IO_lock_t) _IO_lock_initializer))
34 #define _IO_lock_fini(_name) \
37 #define _IO_lock_lock(_name) \
39 void *__self = THREAD_SELF; \
40 if ((_name).owner != __self) \
42 lll_lock ((_name).lock, LLL_PRIVATE); \
43 (_name).owner = __self; \
48 #define _IO_lock_trylock(_name) \
51 void *__self = THREAD_SELF; \
52 if ((_name).owner != __self) \
54 if (lll_trylock ((_name).lock) == 0) \
56 (_name).owner = __self; \
67 #define _IO_lock_unlock(_name) \
69 if (--(_name).cnt == 0) \
71 (_name).owner = NULL; \
72 lll_unlock ((_name).lock, LLL_PRIVATE); \
78 #define _IO_cleanup_region_start(_fct, _fp) \
79 __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
80 #define _IO_cleanup_region_start_noarg(_fct) \
81 __libc_cleanup_region_start (1, _fct, NULL)
82 #define _IO_cleanup_region_end(_doit) \
83 __libc_cleanup_region_end (_doit)
85 #if defined _LIBC && IS_IN (libc)
88 # define _IO_acquire_lock(_fp) \
90 FILE *_IO_acquire_lock_file \
91 __attribute__((cleanup (_IO_acquire_lock_fct))) \
93 _IO_flockfile (_IO_acquire_lock_file);
95 # define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
97 # define _IO_release_lock(_fp) ; } while (0)
101 #endif /* stdio-lock.h */