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- /*
- * Mach Operating System
- * Copyright (c) 1991,1990,1989 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.
- */
- /*
- * Author: David B. Golub, Carnegie Mellon University
- * Date: 11/89
- *
- * Bind an IO operation to the master CPU.
- */
- #ifndef _DEVICE_DEV_MASTER_H_
- #define _DEVICE_DEV_MASTER_H_
- #include <cpus.h>
- #if NCPUS > 1
- #include <kern/macros.h>
- #include <kern/cpu_number.h>
- #include <kern/sched_prim.h>
- #include <kern/thread.h>
- #include <kern/processor.h>
- #define io_grab_master() \
- MACRO_BEGIN \
- thread_bind(current_thread(), master_processor); \
- if (current_processor() != master_processor) \
- thread_block((void (*)()) 0); \
- MACRO_END
- #define io_release_master() \
- MACRO_BEGIN \
- thread_bind(current_thread(), PROCESSOR_NULL); \
- MACRO_END
- #else NCPUS > 1
- #define io_grab_master()
- #define io_release_master()
- #endif NCPUS > 1
- #endif /* _DEVICE_DEV_MASTER_H_ */
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