libobjc/thr-irix.c

   1 /* GNU Objective C Runtime Thread Interface - SGI IRIX Implementation
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
   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 along with
  17 GNU CC; see the file COPYING.  If not, write to the Free Software
  18 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 <stdlib.h>
  28 #include <sys/types.h>
  29 #include <sys/sysmp.h>
  30 #include <sys/prctl.h>
  31 #include <ulocks.h>
  32 #include <objc/thr.h>
  33 #include "runtime.h"
  34
  35 /* Key structure for maintaining thread specific storage */
  36 static void * __objc_shared_arena_handle = NULL;
  37
  38 /* Backend initialization functions */
  39
  40 /* Initialize the threads subsystem. */
  41 int
  42 __objc_init_thread_system(void)
  43 {
  44   /* Name of IRIX arena. */
  45   char arena_name[64];
  46
  47   DEBUG_PRINTF("__objc_init_thread_system\n");
  48
  49   /* Construct a temporary name for arena. */
  50   sprintf(arena_name, "/usr/tmp/objc_%05u", (unsigned)getpid());
  51
  52   /* Up to 256 threads.  Arena only for threads. */
  53   usconfig(CONF_INITUSERS, 256);
  54   usconfig(CONF_ARENATYPE, US_SHAREDONLY);
  55
  56   /* Initialize the arena */
  57   if (!(__objc_shared_arena_handle = usinit(arena_name)))
  58     /* Failed */
  59     return -1;
  60
  61   return 0;
  62 }
  63
  64 /* Close the threads subsystem. */
  65 int
  66 __objc_close_thread_system(void)
  67 {
  68   return 0;
  69 }
  70
  71 /* Backend thread functions */
  72
  73 /* Create a new thread of execution. */
  74 objc_thread_t
  75 __objc_thread_detach(void (*func)(void *arg), void *arg)
  76 {
  77   objc_thread_t thread_id;
  78   int sys_id;
  79
  80   if ((sys_id = sproc((void *)func, PR_SALL, arg)) >= 0)
  81     thread_id = (objc_thread_t)sys_id;
  82   else
  83     thread_id = NULL;
  84
  85   return thread_id;
  86 }
  87
  88 /* Set the current thread's priority. */
  89 int
  90 __objc_thread_set_priority(int priority)
  91 {
  92   /* Not implemented yet */
  93   return -1;
  94 }
  95
  96 /* Return the current thread's priority. */
  97 int
  98 __objc_thread_get_priority(void)
  99 {
 100   /* Not implemented yet */
 101   return OBJC_THREAD_INTERACTIVE_PRIORITY;
 102 }
 103
 104 /* Yield our process time to another thread. */
 105 void
 106 __objc_thread_yield(void)
 107 {
 108   sginap(0);
 109 }
 110
 111 /* Terminate the current thread. */
 112 int
 113 __objc_thread_exit(void)
 114 {
 115   /* IRIX only has exit. */
 116   exit(__objc_thread_exit_status);
 117
 118   /* Failed if we reached here */
 119   return -1;
 120 }
 121
 122 /* Returns an integer value which uniquely describes a thread. */
 123 objc_thread_t
 124 __objc_thread_id(void)
 125 {
 126   /* Threads are processes. */
 127   return (objc_thread_t)get_pid();
 128 }
 129
 130 /* Sets the thread's local storage pointer. */
 131 int
 132 __objc_thread_set_data(void *value)
 133 {
 134   *((void **)&PRDA->usr_prda) = value;
 135   return 0;
 136 }
 137
 138 /* Returns the thread's local storage pointer. */
 139 void *
 140 __objc_thread_get_data(void)
 141 {
 142   return *((void **)&PRDA->usr_prda);
 143 }
 144
 145 /* Backend mutex functions */
 146
 147 /* Allocate a mutex. */
 148 int
 149 __objc_mutex_allocate(objc_mutex_t mutex)
 150 {
 151   if (!( (ulock_t)(mutex->backend) = usnewlock(__objc_shared_arena_handle) ))
 152     return -1;
 153   else
 154     return 0;
 155 }
 156
 157 /* Deallocate a mutex. */
 158 int
 159 __objc_mutex_deallocate(objc_mutex_t mutex)
 160 {
 161   usfreelock((ulock_t)(mutex->backend), __objc_shared_arena_handle);
 162   return 0;
 163 }
 164
 165 /* Grab a lock on a mutex. */
 166 int
 167 __objc_mutex_lock(objc_mutex_t mutex)
 168 {
 169   if (ussetlock((ulock_t)(mutex->backend)) == 0)
 170     return -1;
 171   else
 172     return 0;
 173 }
 174
 175 /* Try to grab a lock on a mutex. */
 176 int
 177 __objc_mutex_trylock(objc_mutex_t mutex)
 178 {
 179   if (ustestlock((ulock_t)(mutex->backend)) == 0)
 180     return -1;
 181   else
 182     return 0;
 183 }
 184
 185 /* Unlock the mutex */
 186 int
 187 __objc_mutex_unlock(objc_mutex_t mutex)
 188 {
 189   usunsetlock((ulock_t)(mutex->backend));
 190   return 0;
 191 }
 192
 193 /* Backend condition mutex functions */
 194
 195 /* Allocate a condition. */
 196 int
 197 __objc_condition_allocate(objc_condition_t condition)
 198 {
 199   /* Unimplemented. */
 200   return -1;
 201 }
 202
 203 /* Deallocate a condition. */
 204 int
 205 __objc_condition_deallocate(objc_condition_t condition)
 206 {
 207   /* Unimplemented. */
 208   return -1;
 209 }
 210
 211 /* Wait on the condition */
 212 int
 213 __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 214 {
 215   /* Unimplemented. */
 216   return -1;
 217 }
 218
 219 /* Wake up all threads waiting on this condition. */
 220 int
 221 __objc_condition_broadcast(objc_condition_t condition)
 222 {
 223   /* Unimplemented. */
 224   return -1;
 225 }
 226
 227 /* Wake up one thread waiting on this condition. */
 228 int
 229 __objc_condition_signal(objc_condition_t condition)
 230 {
 231   /* Unimplemented. */
 232   return -1;
 233 }
 234
 235 /* End of File */