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- /*
- * Mach Operating System
- * Copyright (c) 1992 Carnegie Mellon University
- * All Rights Reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
- * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
- * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie Mellon
- * the rights to redistribute these changes.
- */
- /*
- * HISTORY
- * $Log: parallel.h,v $
- * Revision 2.1 92/04/21 17:16:36 rwd
- * BSDSS
- *
- *
- */
-
- /*
- * Serialization for threads within the kernel.
- */
-
- extern struct mutex master_mutex;
-
- #define master_lock() mutex_lock(&master_mutex)
-
- #define master_unlock() mutex_unlock(&master_mutex)
-
- #define unix_master() { \
- if (p->p_master_lock++ == 0) \
- master_lock(); \
- }
-
- #define unix_release() { \
- if (--p->p_master_lock == 0) \
- master_unlock(); \
- }
-
- #define unix_reset() { \
- if (p->p_master_lock > 0) \
- p->p_master_lock = 1; \
- }
-
-