thread_switch.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993,1992,1991,1990,1989 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:        thread_switch.h,v $
   29  * Revision 2.6  93/11/17  17:47:58  dbg
   30  *      Added SWITCH_OPTION_IDLE to leave thread at depressed priority
   31  *      after thread_switch call.
   32  *      [93/07/16            dbg]
   33  * 
   34  * Revision 2.5  93/01/14  17:48:14  danner
   35  *      Standardized include symbol usage.
   36  *      [92/06/10            pds]
   37  * 
   38  * Revision 2.4  91/05/14  17:01:33  mrt
   39  *      Correcting copyright
   40  * 
   41  * Revision 2.3  91/02/05  17:36:45  mrt
   42  *      Changed to new Mach copyright
   43  *      [91/02/01  17:22:02  mrt]
   44  * 
   45  * Revision 2.2  90/06/02  15:00:19  rpd
   46  *      Created for new host/processor technology.
   47  *      [90/03/26  23:51:49  rpd]
   48  * 
   49  *      Merge to X96
   50  *      [89/08/02  23:12:52  dlb]
   51  * 
   52  *      Created.
   53  *      [89/07/25  19:05:41  dlb]
   54  * 
   55  * Revision 2.3  89/10/15  02:06:04  rpd
   56  *      Minor cleanups.
   57  * 
   58  * Revision 2.2  89/10/11  14:41:47  dlb
   59  *      Merge.
   60  *      [89/09/01  17:57:58  dlb]
   61  * 
   62  */
   63 
   64 #ifndef _MACH_THREAD_SWITCH_H_
   65 #define _MACH_THREAD_SWITCH_H_
   66 
   67 /*
   68  *      Constant definitions for thread_switch trap.
   69  */
   70 
   71 #define SWITCH_OPTION_NONE      0       /* no change to current thread */
   72 #define SWITCH_OPTION_DEPRESS   1       /* drop to depressed priority for
   73                                            specified time and restore
   74                                            current priority when awakened,
   75                                            or when no other threads can
   76                                            run */
   77 #define SWITCH_OPTION_WAIT      2       /* sleep for specified time */
   78 #define SWITCH_OPTION_IDLE      3       /* drop to depressed priority for
   79                                            specified time, and restore
   80                                            current priority when time
   81                                            expires.  If there are no other
   82                                            threads to run, run at depressed
   83                                            priority. */
   84 
   85 #define valid_switch_option(opt)        ((0 <= (opt)) && ((opt) <= 3))
   86 
   87 #endif  /* _MACH_THREAD_SWITCH_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/mach/thread_switch.h

FreeBSD/Linux Kernel Cross Reference
sys/mach/thread_switch.h