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cc3521d660
more complicated things than just setting the lock to 0. - Implement stubs for this function in libc and the two threading libraries that are currently in the tree.
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* Lock definitions used in both libc and libpthread.
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*
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*/
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#ifndef _SPINLOCK_H_
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#define _SPINLOCK_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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/*
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* Lock structure with room for debugging information.
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*/
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typedef struct {
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volatile long access_lock;
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volatile long lock_owner;
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volatile char *fname;
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volatile int lineno;
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} spinlock_t;
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#define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 }
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#define _SPINUNLOCK(_lck) _spinunlock(_lck);
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#ifdef _LOCK_DEBUG
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#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__)
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#else
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#define _SPINLOCK(_lck) _spinlock(_lck)
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#endif
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/*
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* Thread function prototype definitions:
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*/
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__BEGIN_DECLS
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long _atomic_lock(volatile long *);
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void _spinlock(spinlock_t *);
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void _spinunlock(spinlock_t *);
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void _spinlock_debug(spinlock_t *, char *, int);
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__END_DECLS
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#endif /* _SPINLOCK_H_ */
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