/* GNU Objective C Runtime Thread Interface - SGI IRIX Implementation   Copyright (C) 1996, 1997 Free Software Foundation, Inc.   Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)This file is part of GNU CC.GNU CC is free software; you can redistribute it and/or modify it under theterms of the GNU General Public License as published by the Free SoftwareFoundation; either version 2, or (at your option) any later version.GNU CC is distributed in the hope that it will be useful, but WITHOUT ANYWARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESSFOR A PARTICULAR PURPOSE.  See the GNU General Public License for moredetails.You should have received a copy of the GNU General Public License along withGNU CC; see the file COPYING.  If not, write to the Free SoftwareFoundation, 59 Temple Place - Suite 330,Boston, MA 02111-1307, USA.  *//* As a special exception, if you link this library with files compiled with   GCC to produce an executable, this does not cause the resulting executable   to be covered by the GNU General Public License. This exception does not   however invalidate any other reasons why the executable file might be   covered by the GNU General Public License.  */#include <stdlib.h>#include <sys/types.h>#include <sys/sysmp.h>#include <sys/prctl.h>#include <ulocks.h>#include <objc/thr.h>#include "runtime.h"/* Key structure for maintaining thread specific storage */static void * __objc_shared_arena_handle = NULL;/* Backend initialization functions *//* Initialize the threads subsystem. */int__objc_init_thread_system(void){  /* Name of IRIX arena. */  char arena_name[64];  DEBUG_PRINTF("__objc_init_thread_system\n");  /* Construct a temporary name for arena. */  sprintf(arena_name, "/usr/tmp/objc_%05u", (unsigned)getpid());  /* Up to 256 threads.  Arena only for threads. */  usconfig(CONF_INITUSERS, 256);  usconfig(CONF_ARENATYPE, US_SHAREDONLY);  /* Initialize the arena */  if (!(__objc_shared_arena_handle = usinit(arena_name)))    /* Failed */    return -1;  return 0;}/* Close the threads subsystem. */int__objc_close_thread_system(void){  return 0;}/* Backend thread functions *//* Create a new thread of execution. */objc_thread_t__objc_thread_detach(void (*func)(void *arg), void *arg){  objc_thread_t thread_id;  int sys_id;  if ((sys_id = sproc((void *)func, PR_SALL, arg)) >= 0)    thread_id = (objc_thread_t)sys_id;  else    thread_id = NULL;    return thread_id;}/* Set the current thread's priority. */int__objc_thread_set_priority(int priority){  /* Not implemented yet */  return -1;}/* Return the current thread's priority. */int__objc_thread_get_priority(void){  /* Not implemented yet */  return OBJC_THREAD_INTERACTIVE_PRIORITY;}/* Yield our process time to another thread. */void__objc_thread_yield(void){  sginap(0);}/* Terminate the current thread. */int__objc_thread_exit(void){  /* IRIX only has exit. */  exit(__objc_thread_exit_status);  /* Failed if we reached here */  return -1;}/* Returns an integer value which uniquely describes a thread. */objc_thread_t__objc_thread_id(void){  /* Threads are processes. */  return (objc_thread_t)get_pid();}/* Sets the thread's local storage pointer. */int__objc_thread_set_data(void *value){  *((void **)&PRDA->usr_prda) = value;  return 0;}/* Returns the thread's local storage pointer. */void *__objc_thread_get_data(void){  return *((void **)&PRDA->usr_prda);}/* Backend mutex functions *//* Allocate a mutex. */int__objc_mutex_allocate(objc_mutex_t mutex){  if (!( (ulock_t)(mutex->backend) = usnewlock(__objc_shared_arena_handle) ))    return -1;  else    return 0;}/* Deallocate a mutex. */int__objc_mutex_deallocate(objc_mutex_t mutex){  usfreelock((ulock_t)(mutex->backend), __objc_shared_arena_handle);  return 0;}/* Grab a lock on a mutex. */int__objc_mutex_lock(objc_mutex_t mutex){  if (ussetlock((ulock_t)(mutex->backend)) == 0)    return -1;  else    return 0;}/* Try to grab a lock on a mutex. */int__objc_mutex_trylock(objc_mutex_t mutex){  if (ustestlock((ulock_t)(mutex->backend)) == 0)    return -1;  else    return 0;}/* Unlock the mutex */int__objc_mutex_unlock(objc_mutex_t mutex){  usunsetlock((ulock_t)(mutex->backend));  return 0;}/* Backend condition mutex functions *//* Allocate a condition. */int__objc_condition_allocate(objc_condition_t condition){  /* Unimplemented. */  return -1;}/* Deallocate a condition. */int__objc_condition_deallocate(objc_condition_t condition){  /* Unimplemented. */  return -1;}/* Wait on the condition */int__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex){  /* Unimplemented. */  return -1;}/* Wake up all threads waiting on this condition. */int__objc_condition_broadcast(objc_condition_t condition){  /* Unimplemented. */  return -1;}/* Wake up one thread waiting on this condition. */int__objc_condition_signal(objc_condition_t condition){  /* Unimplemented. */  return -1;}/* End of File */