threads/cprocs.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1989 Carnegie-Mellon University
  28  * All rights reserved.  The CMU software License Agreement specifies
  29  * the terms and conditions for use and redistribution.
  30  */
  31
  32 /*
  33  * HISTORY
  34  * 22-July-93 Blaine Garst
  35  *      fixed kernel cache set up of cproc info
  36  *
  37  * 05-April-90  Morris Meyer (mmeyer) at NeXT
  38  *      Fixed bug in cproc_fork_child() where the first cproc would
  39  *      try doing a msg_rpc() with an invalid reply port.
  40  *
  41  */
  42
  43 /*
  44  * cprocs.c - by Eric Cooper
  45  *
  46  * Implementation of cprocs (lightweight processes)
  47  * and primitive synchronization operations.
  48  */
  49 #include <stdlib.h>
  50 #include "pthread_internals.h"
  51 #include "cthreads.h"
  52 #include "cthread_internals.h"
  53 #include <mach/message.h>
  54
  55 /*
  56  * C Threads imports:
  57  */
  58 extern void stack_init();
  59 extern void alloc_stack(), _dealloc_stack();
  60
  61 /*
  62  * Mach imports:
  63  */
  64 extern mach_port_t mach_thread_self();
  65 extern boolean_t swtch_pri();
  66
  67 #ifdef  CTHREADS_DEBUG
  68 private void
  69 print_cproc(p)
  70         cproc_t p;
  71 {
  72         char *s;
  73
  74         switch (p->state) {
  75             case CPROC_RUNNING:
  76                 s = "";
  77                 break;
  78             case CPROC_SPINNING:
  79                 s = "+";
  80                 break;
  81             case CPROC_BLOCKED:
  82                 s = "*";
  83                 break;
  84             default:
  85                 ASSERT(SHOULDNT_HAPPEN);
  86         }
  87         printf(" %x(%s)%s",
  88                 p->id,
  89                 cthread_name(p->incarnation), s);
  90 }
  91
  92 private void
  93 print_cproc_queue(name, queue)
  94         const char * name;
  95         cthread_queue_t queue;
  96 {
  97         printf("[%s] %s:", cthread_name(cthread_self()), name);
  98         cthread_queue_map(queue, cproc_t, print_cproc);
  99         printf("\n");
 100 }
 101 #endif  /* CTHREADS_DEBUG */
 102
 103 #ifdef  CTHREADS_DEBUG
 104 private cproc_t cprocs = NO_CPROC;      /* linked list of cprocs */
 105
 106 private void
 107 print_all_cprocs()
 108 {
 109         cproc_t p;
 110
 111         printf("[%s] cprocs:", cthread_name(cthread_self()));
 112         for (p = cprocs; p != NO_CPROC; p = p->link)
 113                 print_cproc(p);
 114         printf("\n");
 115 }
 116 #endif  /* CTHREADS_DEBUG */
 117
 118 /*
 119  * Routines for supporting fork() of multi-threaded programs.
 120  */
 121
 122 void
 123 _cproc_fork_child()
 124 /*
 125  * Called in the child after a fork().  Resets cproc data structures to
 126  * coincide with the reality that we now have a single cproc and cthread.
 127  */
 128 {
 129         pthread_t pself;
 130
 131         pself = pthread_self();
 132         pself->reply_port = MACH_PORT_NULL;
 133 }
 134
 135 /*
 136  *      Support for a per-thread UNIX errno.
 137  */
 138
 139 #undef errno
 140 extern int errno;
 141 extern int *__error(void);
 142
 143 void
 144 cthread_set_errno_self(error)
 145         int     error;
 146 {
 147         int *ep = __error();
 148
 149         if (ep != &errno)
 150             *ep = error;
 151
 152         errno = error;
 153 }
 154