/* GNU Objective C Runtime Thread Interface - Win32 Implementation   Copyright (C) 1996, 1997 Free Software Foundation, Inc.   Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)This file is part of GCC.GCC 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.GCC 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 withGCC; see the file COPYING.  If not, write to the Free SoftwareFoundation, 51 Franklin Street, Fifth Floor,Boston, MA 02110-1301, 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 "objc/thr.h"#include "objc/runtime.h"#ifndef __OBJC__#define __OBJC__#endif#include <windows.h>/* Key structure for maintaining thread specific storage */static DWORD	__objc_data_tls = (DWORD)-1;/* Backend initialization functions *//* Initialize the threads subsystem. */int__objc_init_thread_system(void){  /* Initialize the thread storage key */  if ((__objc_data_tls = TlsAlloc()) != (DWORD)-1)    return 0;  else    return -1;}/* Close the threads subsystem. */int__objc_close_thread_system(void){  if (__objc_data_tls != (DWORD)-1)    TlsFree(__objc_data_tls);  return 0;}/* Backend thread functions *//* Create a new thread of execution. */objc_thread_t__objc_thread_detach(void (*func)(void *arg), void *arg){  DWORD	thread_id = 0;  HANDLE win32_handle;  if (!(win32_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)func,                                   arg, 0, &thread_id)))    thread_id = 0;    return (objc_thread_t)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 = THREAD_PRIORITY_NORMAL;      break;    default:    case OBJC_THREAD_BACKGROUND_PRIORITY:      sys_priority = THREAD_PRIORITY_BELOW_NORMAL;      break;    case OBJC_THREAD_LOW_PRIORITY:      sys_priority = THREAD_PRIORITY_LOWEST;      break;    }  /* Change priority */  if (SetThreadPriority(GetCurrentThread(), sys_priority))    return 0;  else    return -1;}/* Return the current thread's priority. */int__objc_thread_get_priority(void){  int sys_priority;  sys_priority = GetThreadPriority(GetCurrentThread());    switch (sys_priority)    {    case THREAD_PRIORITY_HIGHEST:    case THREAD_PRIORITY_TIME_CRITICAL:    case THREAD_PRIORITY_ABOVE_NORMAL:    case THREAD_PRIORITY_NORMAL:      return OBJC_THREAD_INTERACTIVE_PRIORITY;    default:    case THREAD_PRIORITY_BELOW_NORMAL:      return OBJC_THREAD_BACKGROUND_PRIORITY;        case THREAD_PRIORITY_IDLE:    case THREAD_PRIORITY_LOWEST:      return OBJC_THREAD_LOW_PRIORITY;    }  /* Couldn't get priority. */  return -1;}/* Yield our process time to another thread. */void__objc_thread_yield(void){  Sleep(0);}/* Terminate the current thread. */int__objc_thread_exit(void){  /* exit the thread */  ExitThread(__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){  return (objc_thread_t)GetCurrentThreadId();}/* Sets the thread's local storage pointer. */int__objc_thread_set_data(void *value){  if (TlsSetValue(__objc_data_tls, value))    return 0;  else    return -1;}/* Returns the thread's local storage pointer. */void *__objc_thread_get_data(void){  return TlsGetValue(__objc_data_tls);          /* Return thread data.      */}/* Backend mutex functions *//* Allocate a mutex. */int__objc_mutex_allocate(objc_mutex_t mutex){  if ((mutex->backend = (void *)CreateMutex(NULL, 0, NULL)) == NULL)    return -1;  else    return 0;}/* Deallocate a mutex. */int__objc_mutex_deallocate(objc_mutex_t mutex){  CloseHandle((HANDLE)(mutex->backend));  return 0;}/* Grab a lock on a mutex. */int__objc_mutex_lock(objc_mutex_t mutex){  int status;  status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE);  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)    return -1;  else    return 0;}/* Try to grab a lock on a mutex. */int__objc_mutex_trylock(objc_mutex_t mutex){  int status;  status = WaitForSingleObject((HANDLE)(mutex->backend), 0);  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)    return -1;  else    return 0;}/* Unlock the mutex */int__objc_mutex_unlock(objc_mutex_t mutex){  if (ReleaseMutex((HANDLE)(mutex->backend)) == 0)    return -1;  else    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 */