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Annotation of OSKit-Mach/device/dev_master.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     Author: David B. Golub, Carnegie Mellon University
                     28:  *     Date:   11/89
                     29:  *
                     30:  *     Bind an IO operation to the master CPU.
                     31:  */
                     32: 
                     33: #include <cpus.h>
                     34: 
                     35: #if    NCPUS > 1
                     36: 
                     37: #include <kern/macro_help.h>
                     38: #include <kern/cpu_number.h>
                     39: #include <kern/sched_prim.h>
                     40: #include <kern/thread.h>
                     41: #include <kern/processor.h>
                     42: 
                     43: #define        io_grab_master() \
                     44:        MACRO_BEGIN \
                     45:        thread_bind(current_thread(), master_processor); \
                     46:        if (current_processor() != master_processor) \
                     47:            thread_block((void (*)()) 0); \
                     48:        MACRO_END
                     49: 
                     50: #define        io_release_master() \
                     51:        MACRO_BEGIN \
                     52:        thread_bind(current_thread(), PROCESSOR_NULL); \
                     53:        MACRO_END
                     54: 
                     55: #else  NCPUS > 1
                     56: 
                     57: #define        io_grab_master()
                     58: #define        io_release_master()
                     59: 
                     60: #endif NCPUS > 1

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