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