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/* Copyright (C) 1994-2021 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 */
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