dev_master.h

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    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  Software.Distribution@CS.CMU.EDU
   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  * HISTORY
   28  * $Log:        dev_master.h,v $
   29  * Revision 2.6  91/05/14  15:41:00  mrt
   30  *      Correcting copyright
   31  * 
   32  * Revision 2.5  91/02/05  17:08:30  mrt
   33  *      Changed to new Mach copyright
   34  *      [91/01/31  17:27:25  mrt]
   35  * 
   36  * Revision 2.4  91/01/08  15:09:30  rpd
   37  *      Added continuation argument to thread_block.
   38  *      [90/12/08            rpd]
   39  * 
   40  * Revision 2.3  90/10/12  18:07:25  rpd
   41  *      Fixed calls to thread_bind in io_grab_master and io_release_master.
   42  *      [90/10/10            rpd]
   43  * 
   44  * Revision 2.2  90/01/11  11:41:48  dbg
   45  *      Created.
   46  *      [89/11/27            dbg]
   47  * 
   48  */
   49 /*
   50  *      Author: David B. Golub, Carnegie Mellon University
   51  *      Date:   11/89
   52  *
   53  *      Bind an IO operation to the master CPU.
   54  */
   55 
   56 #include <cpus.h>
   57 
   58 #if     NCPUS > 1
   59 
   60 #include <kern/macro_help.h>
   61 #include <kern/cpu_number.h>
   62 #include <kern/sched_prim.h>
   63 #include <kern/thread.h>
   64 #include <kern/processor.h>
   65 
   66 #define io_grab_master() \
   67         MACRO_BEGIN \
   68         thread_bind(current_thread(), master_processor); \
   69         if (current_processor() != master_processor) \
   70             thread_block((void (*)()) 0); \
   71         MACRO_END
   72 
   73 #define io_release_master() \
   74         MACRO_BEGIN \
   75         thread_bind(current_thread(), PROCESSOR_NULL); \
   76         MACRO_END
   77 
   78 #else   NCPUS > 1
   79 
   80 #define io_grab_master()
   81 #define io_release_master()
   82 
   83 #endif  NCPUS > 1

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FreeBSD/Linux Kernel Cross Reference sys/device/dev_master.h

FreeBSD/Linux Kernel Cross Reference
sys/device/dev_master.h