thread_os2.h 5.14 KB
Newer Older
Guido van Rossum's avatar
Guido van Rossum committed
1
/***********************************************************
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.

STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
Guido van Rossum's avatar
Guido van Rossum committed
29
  
30
******************************************************************/
Guido van Rossum's avatar
Guido van Rossum committed
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

/* This code implemented by cvale@netcom.com */

#define INCL_DOSPROCESS
#define INCL_DOSSEMAPHORES
#include "os2.h"
#include "limits.h"

#include "process.h"

long get_thread_ident(void);


/*
 * Initialization of the C package, should not be needed.
 */
static void _init_thread(void)
{
}

/*
 * Thread support.
 */
int start_new_thread(void (*func)(void *), void *arg)
{
  int aThread;
  int success = 1;

59
  aThread = _beginthread(func,NULL,65536,arg);
Guido van Rossum's avatar
Guido van Rossum committed
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212

  if( aThread == -1 ) {
    success = 0;
    fprintf(stderr,"aThread failed == %d",aThread);
    dprintf(("_beginthread failed. return %ld\n", errno));
  }

  return success;
}

long get_thread_ident(void)
{
  PPIB pib;
  PTIB tib;

  if (!initialized)
    init_thread();
        
  DosGetInfoBlocks(&tib,&pib);
  return tib->tib_ptib2->tib2_ultid;
}

static void do_exit_thread(int no_cleanup)
{
  dprintf(("%ld: exit_thread called\n", get_thread_ident()));
  if (!initialized)
    if (no_cleanup)
      _exit(0);
    else
      exit(0);
  _endthread();
}

void exit_thread(void)
{
  do_exit_thread(0);
}

void _exit_thread(void)
{
  do_exit_thread(1);
}

#ifndef NO_EXIT_PROG
static void do_exit_prog(int status, int no_cleanup)
{
  dprintf(("exit_prog(%d) called\n", status));
  if (!initialized)
    if (no_cleanup)
      _exit(status);
    else
      exit(status);
}

void exit_prog(int status)
{
  do_exit_prog(status, 0);
}

void _exit_prog _P1(int status)
{
  do_exit_prog(status, 1);
}
#endif /* NO_EXIT_PROG */

/*
 * Lock support. It has too be implemented as semaphores.
 * I [Dag] tried to implement it with mutex but I could find a way to
 * tell whether a thread already own the lock or not.
 */
type_lock allocate_lock(void)
{
  HMTX   aLock;
  APIRET rc;

  dprintf(("allocate_lock called\n"));
  if (!initialized)
    init_thread();

  DosCreateMutexSem(NULL,  /* Sem name      */
                    &aLock, /* the semaphone */
                    0,     /* shared ?      */
                    0);    /* initial state */  

  dprintf(("%ld: allocate_lock() -> %lx\n", get_thread_ident(), (long)aLock));

  return (type_lock) aLock;
}

void free_lock(type_lock aLock)
{
  dprintf(("%ld: free_lock(%lx) called\n", get_thread_ident(),(long)aLock));

  DosCloseMutexSem((HMTX)aLock);
}

/*
 * Return 1 on success if the lock was acquired
 *
 * and 0 if the lock was not acquired. This means a 0 is returned
 * if the lock has already been acquired by this thread!
 */
int acquire_lock(type_lock aLock, int waitflag)
{
  int   success = 1;
  ULONG rc, count;
  PID   pid = 0;
  TID   tid = 0;

  dprintf(("%ld: acquire_lock(%lx, %d) called\n", get_thread_ident(),
           (long)aLock, waitflag));

  DosQueryMutexSem((HMTX)aLock,&pid,&tid,&count);
  if( tid == get_thread_ident() ) { /* if we own this lock */
    success = 0;
  } else {
    rc = DosRequestMutexSem((HMTX) aLock,
                            (waitflag == 1 ? SEM_INDEFINITE_WAIT : 0));
    
    if( rc != 0) {
      success = 0;                /* We failed */
    }
  }

  dprintf(("%ld: acquire_lock(%lx, %d) -> %d\n",
           get_thread_ident(),(long)aLock, waitflag, success));

  return success;
}

void release_lock(type_lock aLock)
{
  dprintf(("%ld: release_lock(%lx) called\n", get_thread_ident(),(long)aLock));

  if ( DosReleaseMutexSem( (HMTX) aLock ) != 0 ) {
    dprintf(("%ld: Could not release_lock(%lx) error: %l\n",
             get_thread_ident(), (long)aLock, GetLastError()));
  }
}

/*
 * Semaphore support.
 */
type_sema allocate_sema(int value)
{
  return (type_sema) 0;
}

void free_sema(type_sema aSemaphore)
{

}

213
int down_sema(type_sema aSemaphore, int waitflag)
Guido van Rossum's avatar
Guido van Rossum committed
214
{
215
  return -1;
Guido van Rossum's avatar
Guido van Rossum committed
216 217 218 219 220 221
}

void up_sema(type_sema aSemaphore)
{
  dprintf(("%ld: up_sema(%lx)\n", get_thread_ident(), (long)aSemaphore));
}