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/* 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 the

terms of the GNU General Public License as published by the Free Software

Foundation; either version 2, or (at your option) any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more

details.

You should have received a copy of the GNU General Public License along with

GCC; see the file COPYING.  If not, write to the Free Software

Foundation, 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 */