/* GNU Objective C Runtime Thread Interface   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 <pthread.h>#include <objc/thr.h>#include "runtime.h"/* Key structure for maintaining thread specific storage */static pthread_key_t _objc_thread_storage;/* Backend initialization functions *//* Initialize the threads subsystem. */int__objc_init_thread_system(void){  /* Initialize the thread storage key */  return pthread_keycreate(&_objc_thread_storage, NULL);}/* Close the threads subsystem. */int__objc_close_thread_system(void){  /* Destroy the thread storage key */  /* Not implemented yet */  /* return pthread_key_delete(&_objc_thread_storage); */  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;  pthread_t new_thread_handle;  if (pthread_create(&new_thread_handle, pthread_attr_default,		     (void *)func, arg) == 0)    {      /* ??? May not work! (64bit) */      thread_id = *(objc_thread_t *)&new_thread_handle;       pthread_detach(&new_thread_handle);     /* Fully detach thread.     */    }  else    thread_id = NULL;    return thread_id;}/* Set the current thread's priority. */int__objc_thread_set_priority(int priority){  int sys_priority = 0;  switch (priority)    {    case OBJC_THREAD_INTERACTIVE_PRIORITY:      sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;      break;    default:    case OBJC_THREAD_BACKGROUND_PRIORITY:      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;      break;    case OBJC_THREAD_LOW_PRIORITY:      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;      break;    }      /* Change the priority. */  if (pthread_setprio(pthread_self(), sys_priority) >= 0)    return 0;  else    /* Failed */    return -1;}/* Return the current thread's priority. */int__objc_thread_get_priority(void){  int sys_priority;      if ((sys_priority = pthread_getprio(pthread_self())) >= 0) {    if (sys_priority >= PRI_FG_MIN_NP && sys_priority <= PRI_FG_MAX_NP)      return OBJC_THREAD_INTERACTIVE_PRIORITY;    if (sys_priority >= PRI_BG_MIN_NP && sys_priority <= PRI_BG_MAX_NP)      return OBJC_THREAD_BACKGROUND_PRIORITY;    return OBJC_THREAD_LOW_PRIORITY;  }  /* Failed */  return -1;}/* Yield our process time to another thread. */void__objc_thread_yield(void){  pthread_yield();}/* Terminate the current thread. */int__objc_thread_exit(void){  /* exit the thread */  pthread_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){  pthread_t self = pthread_self();  return (objc_thread_t) pthread_getunique_np (&self);}/* Sets the thread's local storage pointer. */int__objc_thread_set_data(void *value){  return pthread_setspecific(_objc_thread_storage, value);}/* Returns the thread's local storage pointer. */void *__objc_thread_get_data(void){  void *value = NULL;  if ( !(pthread_getspecific(_objc_thread_storage, &value)) )    return value;  return NULL;}/* Backend mutex functions *//* Allocate a mutex. */int__objc_mutex_allocate(objc_mutex_t mutex){  if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)), 			 pthread_mutexattr_default))    return -1;  else    return 0;}/* Deallocate a mutex. */int__objc_mutex_deallocate(objc_mutex_t mutex){  if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))    return -1;  else    return 0;}/* Grab a lock on a mutex. */int__objc_mutex_lock(objc_mutex_t mutex){  return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));}/* Try to grab a lock on a mutex. */int__objc_mutex_trylock(objc_mutex_t mutex){  if (pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend))) != 1)    return -1;  else    return 0;}/* Unlock the mutex */int__objc_mutex_unlock(objc_mutex_t mutex){  return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));}/* Backend condition mutex functions *//* Allocate a condition. */int__objc_condition_allocate(objc_condition_t condition){  /* Unimplemented. */  return -1;  /*  if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))    return -1;  else    return 0;    */}/* Deallocate a condition. */int__objc_condition_deallocate(objc_condition_t condition){  /* Unimplemented. */  return -1;  /*  return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));  */}/* Wait on the condition */int__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex){  /* Unimplemented. */  return -1;  /*  return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),			   (pthread_mutex_t *)(&(mutex->backend)));			   */}/* Wake up all threads waiting on this condition. */int__objc_condition_broadcast(objc_condition_t condition){  /* Unimplemented. */  return -1;  /*  return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));  */}/* Wake up one thread waiting on this condition. */int__objc_condition_signal(objc_condition_t condition){  /* Unimplemented. */  return -1;  /*  return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));  */}/* End of File */