libobjc/thr-os2.c

   1 /* GNU Objective C Runtime Thread Interface - OS/2 emx Implementation
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Thomas Baier (baier@ci.tuwien.ac.at)
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 2, or (at your option) any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13 FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14 details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* As a special exception, if you link this library with files compiled with
  22    GCC to produce an executable, this does not cause the resulting executable
  23    to be covered by the GNU General Public License. This exception does not
  24    however invalidate any other reasons why the executable file might be
  25    covered by the GNU General Public License.  */
  26
  27 #include <objc/thr.h>
  28 #include "runtime.h"
  29
  30 #define INCL_DOSSEMAPHORES
  31 #define INCL_DOSPROCESS
  32
  33 /*
  34  * conflicts with objc.h:       SEL, BOOL, id
  35  * solution:  prefixing those with _OS2_ before including <os2.h>
  36  */
  37 #define SEL _OS2_SEL
  38 #define BOOL _OS2_BOOL
  39 #define id _OS2_id
  40 #include <os2.h>
  41 #undef id
  42 #undef SEL
  43 #undef BOOL
  44
  45 #include <stdlib.h>
  46
  47 /* Backend initialization functions */
  48
  49 /* Initialize the threads subsystem. */
  50 int
  51 __objc_init_thread_system(void)
  52 {
  53   return 0;
  54 }
  55
  56 /* Close the threads subsystem. */
  57 int
  58 __objc_close_thread_system(void)
  59 {
  60   return 0;
  61 }
  62
  63 /* Backend thread functions */
  64
  65 /* Create a new thread of execution. */
  66 objc_thread_t
  67 __objc_thread_detach(void (*func)(void *arg), void *arg)
  68 {
  69   int thread_id = 0;
  70
  71   if ((thread_id = _beginthread (func,NULL,32768,arg)) < 0)
  72     thread_id = 0;
  73
  74   return (objc_thread_t)thread_id;
  75 }
  76
  77 /* Set the current thread's priority. */
  78 int
  79 __objc_thread_set_priority(int priority)
  80 {
  81   ULONG sys_class = 0;
  82   ULONG sys_priority = 0;
  83
  84   /* OBJC_THREAD_INTERACTIVE_PRIORITY -> PRTYC_FOREGROUNDSERVER
  85    * OBJC_THREAD_BACKGROUND_PRIORITY  -> PRTYC_REGULAR
  86    * OBJC_THREAD_LOW_PRIORITY         -> PRTYC_IDLETIME */
  87
  88   switch (priority) {
  89   case OBJC_THREAD_INTERACTIVE_PRIORITY:
  90     sys_class = PRTYC_REGULAR;
  91     sys_priority = 10;
  92     break;
  93   default:
  94   case OBJC_THREAD_BACKGROUND_PRIORITY:
  95     sys_class = PRTYC_IDLETIME;
  96     sys_priority = 25;
  97     break;
  98   case OBJC_THREAD_LOW_PRIORITY:
  99     sys_class = PRTYC_IDLETIME;
 100     sys_priority = 0;
 101     break;
 102   }
 103
 104   /* Change priority */
 105   if (!DosSetPriority (PRTYS_THREAD,sys_class,sys_priority,*_threadid))
 106     return 0;
 107   else
 108     return -1;
 109 }
 110
 111 /* Return the current thread's priority. */
 112 int
 113 __objc_thread_get_priority(void)
 114 {
 115   PTIB ptib;
 116   PPIB ppib;
 117
 118   /* get information about current thread */
 119   DosGetInfoBlocks (&ptib,&ppib);
 120
 121   switch (ptib->tib_ptib2->tib2_ulpri)
 122     {
 123     case PRTYC_IDLETIME:
 124     case PRTYC_REGULAR:
 125     case PRTYC_TIMECRITICAL:
 126     case PRTYC_FOREGROUNDSERVER:
 127     default:
 128       return OBJC_THREAD_INTERACTIVE_PRIORITY;
 129     }
 130
 131   return -1;
 132 }
 133
 134 /* Yield our process time to another thread. */
 135 void
 136 __objc_thread_yield(void)
 137 {
 138   DosSleep (0);
 139 }
 140
 141 /* Terminate the current thread. */
 142 int
 143 __objc_thread_exit(void)
 144 {
 145   /* terminate the thread, NEVER use DosExit () */
 146   _endthread ();
 147
 148   /* Failed if we reached here */
 149   return -1;
 150 }
 151
 152 /* Returns an integer value which uniquely describes a thread. */
 153 objc_thread_t
 154 __objc_thread_id(void)
 155 {
 156   return (objc_thread_t) *_threadid;
 157 }
 158
 159 /* Sets the thread's local storage pointer. */
 160 int
 161 __objc_thread_set_data(void *value)
 162 {
 163   *_threadstore () = value;
 164
 165   return 0;
 166 }
 167
 168 /* Returns the thread's local storage pointer. */
 169 void *
 170 __objc_thread_get_data(void)
 171 {
 172   return *_threadstore ();
 173 }
 174
 175 /* Backend mutex functions */
 176
 177 /* Allocate a mutex. */
 178 int
 179 __objc_mutex_allocate(objc_mutex_t mutex)
 180 {
 181   if (DosCreateMutexSem (NULL, (HMTX)(&(mutex->backend)),0L,0) > 0)
 182     return -1;
 183   else
 184     return 0;
 185 }
 186
 187 /* Deallocate a mutex. */
 188 int
 189 __objc_mutex_deallocate(objc_mutex_t mutex)
 190 {
 191   DosCloseMutexSem ((HMTX)(mutex->backend));
 192   return 0;
 193 }
 194
 195 /* Grab a lock on a mutex. */
 196 int
 197 __objc_mutex_lock(objc_mutex_t mutex)
 198 {
 199   if (DosRequestMutexSem ((HMTX)(mutex->backend),-1L) != 0)
 200     return -1;
 201   else
 202     return 0;
 203 }
 204
 205 /* Try to grab a lock on a mutex. */
 206 int
 207 __objc_mutex_trylock(objc_mutex_t mutex)
 208 {
 209   if (DosRequestMutexSem ((HMTX)(mutex->backend),0L) != 0)
 210     return -1;
 211   else
 212     return 0;
 213 }
 214
 215 /* Unlock the mutex */
 216 int
 217 __objc_mutex_unlock(objc_mutex_t mutex)
 218 {
 219   if (DosReleaseMutexSem((HMTX)(mutex->backend)) != 0)
 220     return -1;
 221   else
 222     return 0;
 223 }
 224
 225 /* Backend condition mutex functions */
 226
 227 /* Allocate a condition. */
 228 int
 229 __objc_condition_allocate(objc_condition_t condition)
 230 {
 231   /* Unimplemented. */
 232   return -1;
 233 }
 234
 235 /* Deallocate a condition. */
 236 int
 237 __objc_condition_deallocate(objc_condition_t condition)
 238 {
 239   /* Unimplemented. */
 240   return -1;
 241 }
 242
 243 /* Wait on the condition */
 244 int
 245 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 246 {
 247   /* Unimplemented. */
 248   return -1;
 249 }
 250
 251 /* Wake up all threads waiting on this condition. */
 252 int
 253 __objc_condition_broadcast(objc_condition_t condition)
 254 {
 255   /* Unimplemented. */
 256   return -1;
 257 }
 258
 259 /* Wake up one thread waiting on this condition. */
 260 int
 261 __objc_condition_signal(objc_condition_t condition)
 262 {
 263   /* Unimplemented. */
 264   return -1;
 265 }
 266
 267 /* End of File */