mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/* Copyright (C) 1994-2024 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 _LOCK_INTERN_H
|
||
#define _LOCK_INTERN_H
|
||
|
||
#include <sys/cdefs.h>
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
# include <lowlevellock.h>
|
||
#endif
|
||
|
||
#ifndef _EXTERN_INLINE
|
||
#define _EXTERN_INLINE __extern_inline
|
||
#endif
|
||
|
||
/* The type of a spin lock variable. */
|
||
typedef unsigned int __spin_lock_t;
|
||
|
||
/* Static initializer for spinlocks. */
|
||
#define __SPIN_LOCK_INITIALIZER LLL_LOCK_INITIALIZER
|
||
|
||
/* Initialize LOCK. */
|
||
|
||
extern void __spin_lock_init (__spin_lock_t *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE void
|
||
__spin_lock_init (__spin_lock_t *__lock)
|
||
{
|
||
*__lock = __SPIN_LOCK_INITIALIZER;
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Lock LOCK, blocking if we can't get it. */
|
||
extern void __spin_lock_solid (__spin_lock_t *__lock);
|
||
|
||
/* Lock the spin lock LOCK. */
|
||
|
||
extern void __spin_lock (__spin_lock_t *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE void
|
||
__spin_lock (__spin_lock_t *__lock)
|
||
{
|
||
__lll_lock (__lock, 0);
|
||
}
|
||
#endif
|
||
|
||
/* Unlock LOCK. */
|
||
extern void __spin_unlock (__spin_lock_t *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE void
|
||
__spin_unlock (__spin_lock_t *__lock)
|
||
{
|
||
__lll_unlock (__lock, 0);
|
||
}
|
||
#endif
|
||
|
||
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
|
||
extern int __spin_try_lock (__spin_lock_t *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE int
|
||
__spin_try_lock (__spin_lock_t *__lock)
|
||
{
|
||
return (__lll_trylock (__lock) == 0);
|
||
}
|
||
#endif
|
||
|
||
/* Return nonzero if LOCK is locked. */
|
||
extern int __spin_lock_locked (__spin_lock_t *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE int
|
||
__spin_lock_locked (__spin_lock_t *__lock)
|
||
{
|
||
return (*(volatile __spin_lock_t *)__lock != 0);
|
||
}
|
||
#endif
|
||
|
||
/* Name space-clean internal interface to mutex locks. */
|
||
struct mutex {
|
||
__spin_lock_t __held;
|
||
__spin_lock_t __lock;
|
||
const char *__name;
|
||
void *__head, *__tail;
|
||
void *__holder;
|
||
};
|
||
|
||
#define MUTEX_INITIALIZER { __SPIN_LOCK_INITIALIZER }
|
||
|
||
/* Initialize the newly allocated mutex lock LOCK for further use. */
|
||
extern void __mutex_init (void *__lock);
|
||
|
||
/* Lock the mutex lock LOCK. */
|
||
|
||
extern void __mutex_lock (void *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE void
|
||
__mutex_lock (void *__lock)
|
||
{
|
||
__spin_lock ((__spin_lock_t *)__lock);
|
||
}
|
||
#endif
|
||
|
||
/* Unlock the mutex lock LOCK. */
|
||
|
||
extern void __mutex_unlock (void *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE void
|
||
__mutex_unlock (void *__lock)
|
||
{
|
||
__spin_unlock ((__spin_lock_t *)__lock);
|
||
}
|
||
#endif
|
||
|
||
|
||
extern int __mutex_trylock (void *__lock);
|
||
|
||
#if defined __USE_EXTERN_INLINES && defined _LIBC
|
||
_EXTERN_INLINE int
|
||
__mutex_trylock (void *__lock)
|
||
{
|
||
return (__spin_try_lock ((__spin_lock_t *)__lock));
|
||
}
|
||
#endif
|
||
|
||
#endif /* lock-intern.h */
|