147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/* Copyright (C) 1994-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _LOCK_INTERN_H
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#define _LOCK_INTERN_H
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#include <sys/cdefs.h>
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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# include <lowlevellock.h>
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#endif
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#ifndef _EXTERN_INLINE
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#define _EXTERN_INLINE __extern_inline
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#endif
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/* The type of a spin lock variable. */
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typedef unsigned int __spin_lock_t;
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/* Static initializer for spinlocks. */
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#define __SPIN_LOCK_INITIALIZER LLL_LOCK_INITIALIZER
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/* Initialize LOCK. */
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extern void __spin_lock_init (__spin_lock_t *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE void
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__spin_lock_init (__spin_lock_t *__lock)
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{
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*__lock = __SPIN_LOCK_INITIALIZER;
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}
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#endif
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/* Lock LOCK, blocking if we can't get it. */
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extern void __spin_lock_solid (__spin_lock_t *__lock);
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/* Lock the spin lock LOCK. */
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extern void __spin_lock (__spin_lock_t *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE void
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__spin_lock (__spin_lock_t *__lock)
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{
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__lll_lock (__lock, 0);
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}
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#endif
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/* Unlock LOCK. */
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extern void __spin_unlock (__spin_lock_t *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE void
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__spin_unlock (__spin_lock_t *__lock)
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{
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__lll_unlock (__lock, 0);
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}
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#endif
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/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
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extern int __spin_try_lock (__spin_lock_t *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE int
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__spin_try_lock (__spin_lock_t *__lock)
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{
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return (__lll_trylock (__lock) == 0);
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}
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#endif
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/* Return nonzero if LOCK is locked. */
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extern int __spin_lock_locked (__spin_lock_t *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE int
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__spin_lock_locked (__spin_lock_t *__lock)
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{
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return (*(volatile __spin_lock_t *)__lock != 0);
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}
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#endif
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/* Name space-clean internal interface to mutex locks. */
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struct mutex {
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__spin_lock_t __held;
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__spin_lock_t __lock;
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const char *__name;
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void *__head, *__tail;
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void *__holder;
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};
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#define MUTEX_INITIALIZER { __SPIN_LOCK_INITIALIZER }
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/* Initialize the newly allocated mutex lock LOCK for further use. */
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extern void __mutex_init (void *__lock);
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/* Lock the mutex lock LOCK. */
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extern void __mutex_lock (void *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE void
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__mutex_lock (void *__lock)
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{
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__spin_lock ((__spin_lock_t *)__lock);
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}
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#endif
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/* Unlock the mutex lock LOCK. */
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extern void __mutex_unlock (void *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE void
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__mutex_unlock (void *__lock)
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{
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__spin_unlock ((__spin_lock_t *)__lock);
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}
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#endif
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extern int __mutex_trylock (void *__lock);
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#if defined __USE_EXTERN_INLINES && defined _LIBC
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_EXTERN_INLINE int
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__mutex_trylock (void *__lock)
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{
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return (__spin_try_lock ((__spin_lock_t *)__lock));
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}
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#endif
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#endif /* lock-intern.h */
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