mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/* Thread package specific definitions of stream lock type. NPTL version.
|
|
Copyright (C) 2000-2020 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 _STDIO_LOCK_H
|
|
#define _STDIO_LOCK_H 1
|
|
|
|
#include <libc-lock.h>
|
|
#include <lowlevellock.h>
|
|
|
|
|
|
/* The locking here is very inexpensive, even for inlining. */
|
|
#define _IO_lock_inexpensive 1
|
|
|
|
typedef struct { int lock; int cnt; void *owner; } _IO_lock_t;
|
|
#define _IO_lock_t_defined 1
|
|
|
|
#define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL }
|
|
|
|
#define _IO_lock_init(_name) \
|
|
((void) ((_name) = (_IO_lock_t) _IO_lock_initializer))
|
|
|
|
#define _IO_lock_fini(_name) \
|
|
((void) 0)
|
|
|
|
#define _IO_lock_lock(_name) \
|
|
do { \
|
|
void *__self = THREAD_SELF; \
|
|
if ((_name).owner != __self) \
|
|
{ \
|
|
lll_lock ((_name).lock, LLL_PRIVATE); \
|
|
(_name).owner = __self; \
|
|
} \
|
|
++(_name).cnt; \
|
|
} while (0)
|
|
|
|
#define _IO_lock_trylock(_name) \
|
|
({ \
|
|
int __result = 0; \
|
|
void *__self = THREAD_SELF; \
|
|
if ((_name).owner != __self) \
|
|
{ \
|
|
if (lll_trylock ((_name).lock) == 0) \
|
|
{ \
|
|
(_name).owner = __self; \
|
|
(_name).cnt = 1; \
|
|
} \
|
|
else \
|
|
__result = EBUSY; \
|
|
} \
|
|
else \
|
|
++(_name).cnt; \
|
|
__result; \
|
|
})
|
|
|
|
#define _IO_lock_unlock(_name) \
|
|
do { \
|
|
if (--(_name).cnt == 0) \
|
|
{ \
|
|
(_name).owner = NULL; \
|
|
lll_unlock ((_name).lock, LLL_PRIVATE); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
|
|
#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 { \
|
|
FILE *_IO_acquire_lock_file \
|
|
__attribute__((cleanup (_IO_acquire_lock_fct))) \
|
|
= (_fp); \
|
|
_IO_flockfile (_IO_acquire_lock_file);
|
|
# else
|
|
# define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
|
|
# endif
|
|
# define _IO_release_lock(_fp) ; } while (0)
|
|
|
|
#endif
|
|
|
|
#endif /* stdio-lock.h */
|