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/* Thread package specific definitions of stream lock type. Generic version.
Copyright (C) 2000, 2001, 2002 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _BITS_STDIO_LOCK_H
#define _BITS_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_MUTEX_LOCK_INITIALIZER, 0, NULL }
#define _IO_lock_init(_name) \
((_name) = (_IO_lock_t) _IO_lock_initializer , 0)
#define _IO_lock_fini(_name) \
((void) 0)
#define _IO_lock_lock(_name) \
do { \
void *__self = THREAD_SELF; \
if ((_name).owner != __self) \
{ \
lll_mutex_lock ((_name).lock); \
(_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_mutex_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_mutex_unlock ((_name).lock); \
} \
} 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)
#endif /* bits/stdio-lock.h */
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