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glibc/sysdeps/nptl/stdio-lock.h
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/* Thread package specific definitions of stream lock type. NPTL version. | |
Copyright (C) 2000-2015 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 <bits/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_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 { \ | |
_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 */ |