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Diffstat (limited to 'tools/KSE/rr/simplelock.h')
-rw-r--r-- | tools/KSE/rr/simplelock.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/tools/KSE/rr/simplelock.h b/tools/KSE/rr/simplelock.h new file mode 100644 index 0000000..2dae6ab --- /dev/null +++ b/tools/KSE/rr/simplelock.h @@ -0,0 +1,59 @@ +/*- + * Copyright (c) 2002 David Xu (davidxu@freebsd.org). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _SIMPLELOCK_H +#define _SIMPLELOCK_H + +#include <machine/asmacros.h> +#include <machine/atomic.h> + +struct simplelock { + int s_lock; +}; + +static inline void +simplelock_init(struct simplelock *lock) +{ + lock->s_lock = 0; +} + +static inline void +simplelock_lock(struct simplelock *lock) +{ + while (!atomic_cmpset_int(&lock->s_lock, 0, 1)) + ; +} + +static inline void +simplelock_unlock(struct simplelock *lock) +{ + atomic_store_rel_int(&lock->s_lock, 0); +} + +#endif + |