bsd/kern/parallel.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Mach Operating System
  24  * Copyright (c) 1989 Carnegie-Mellon University
  25  * Copyright (c) 1988 Carnegie-Mellon University
  26  * Copyright (c) 1987 Carnegie-Mellon University
  27  * All rights reserved.  The CMU software License Agreement specifies
  28  * the terms and conditions for use and redistribution.
  29  */
  30 /*
  31  * HISTORY
  32  *
  33  * Revision 1.1.1.1  1998/09/22 21:06:13  wsanchez
  34  * Import of Mac OS X kernel (~semeria)
  35  *
  36  * Revision 1.1.1.1  1997/09/30 02:44:39  wsanchez
  37  * Import of kernel from umeshv/kernel
  38  *
  39  * Revision 2.4  89/12/22  15:52:48  rpd
  40  *      MACH_HOST support: when releasing master, context switch away
  41  *      immediately if thread is not assigned to default processor set.
  42  *      [89/11/16            dlb]
  43  *
  44  * Revision 2.3  89/10/11  14:19:20  dlb
  45  *      Processor logic - explicitly record bound processor in thread
  46  *      instead of changing whichq pointer.
  47  *      [88/09/30            dlb]
  48  *
  49  * Revision 2.2  89/02/25  18:07:24  gm0w
  50  *      Changes for cleanup.
  51  *
  52  * 15-Oct-87  David Golub (dbg) at Carnegie-Mellon University
  53  *      Use thread_bind (inline version) to bind thread to master cpu
  54  *      while holding unix-lock.
  55  *
  56  *  9-Oct-87  Robert Baron (rvb) at Carnegie-Mellon University
  57  *      Define unix_reset for longjmp/setjmp reset.
  58  *
  59  * 25-Sep-87  Robert Baron (rvb) at Carnegie-Mellon University
  60  *      Clean out some debugging code.
  61  *
  62  * 21-Sep-87  Robert Baron (rvb) at Carnegie-Mellon University
  63  *      Created.
  64  *
  65  */
  66
  67
  68 #include <cpus.h>
  69 #include <mach_host.h>
  70
  71 #if     NCPUS > 1
  72
  73 #include <kern/processor.h>
  74 #include <kern/thread.h>
  75 #include <kern/sched_prim.h>
  76 #include <kern/parallel.h>
  77
  78 void unix_master()
  79 {
  80         register thread_t t = current_thread();
  81
  82         if (! (++( t->unix_lock )))     {
  83
  84                 /* thread_bind(t, master_processor); */
  85                 t->bound_processor = master_processor;
  86
  87                 if (cpu_number() != master_cpu) {
  88                         t->interruptible = FALSE;
  89                         thread_block(0);
  90                 }
  91         }
  92 }
  93
  94 void unix_release()
  95 {
  96         register thread_t t = current_thread();
  97
  98         t->unix_lock--;
  99         if (t->unix_lock < 0) {
 100                 /* thread_bind(t, PROCESSOR_NULL); */
 101                 t->bound_processor = PROCESSOR_NULL;
 102 #if     MACH_HOST
 103                 if (t->processor_set != &default_pset)
 104                         thread_block(0);
 105 #endif  MACH_HOST
 106         }
 107 }
 108
 109 void unix_reset()
 110 {
 111         register thread_t       t = current_thread();
 112
 113         if (t->unix_lock != -1)
 114                 t->unix_lock = 0;
 115 }
 116
 117 #endif  NCPUS > 1