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536abd52d2
(previous GCC/EGCS versions had these files in gcc/objc/)
273 lines
5.9 KiB
C
273 lines
5.9 KiB
C
/* GNU Objective C Runtime Thread Interface - Win32 Implementation
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2, or (at your option) any later version.
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GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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GNU CC; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files compiled with
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GCC to produce an executable, this does not cause the resulting executable
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to be covered by the GNU General Public License. This exception does not
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however invalidate any other reasons why the executable file might be
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covered by the GNU General Public License. */
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#include <objc/thr.h>
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#include "runtime.h"
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#ifndef __OBJC__
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#define __OBJC__
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#endif
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#include <windows.h>
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/* Key structure for maintaining thread specific storage */
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static DWORD __objc_data_tls = (DWORD)-1;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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int
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__objc_init_thread_system(void)
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{
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/* Initialize the thread storage key */
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if ((__objc_data_tls = TlsAlloc()) != (DWORD)-1)
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return 0;
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else
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return -1;
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}
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/* Close the threads subsystem. */
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int
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__objc_close_thread_system(void)
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{
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if (__objc_data_tls != (DWORD)-1)
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TlsFree(__objc_data_tls);
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return 0;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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objc_thread_t
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__objc_thread_detach(void (*func)(void *arg), void *arg)
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{
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DWORD thread_id = 0;
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HANDLE win32_handle;
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if (!(win32_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)func,
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arg, 0, &thread_id)))
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thread_id = 0;
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return (objc_thread_t)thread_id;
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}
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/* Set the current thread's priority. */
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int
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__objc_thread_set_priority(int priority)
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{
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int sys_priority = 0;
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switch (priority)
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{
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case OBJC_THREAD_INTERACTIVE_PRIORITY:
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sys_priority = THREAD_PRIORITY_NORMAL;
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break;
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default:
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case OBJC_THREAD_BACKGROUND_PRIORITY:
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sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case OBJC_THREAD_LOW_PRIORITY:
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sys_priority = THREAD_PRIORITY_LOWEST;
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break;
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}
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/* Change priority */
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if (SetThreadPriority(GetCurrentThread(), sys_priority))
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return 0;
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else
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return -1;
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}
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/* Return the current thread's priority. */
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int
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__objc_thread_get_priority(void)
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{
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int sys_priority;
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sys_priority = GetThreadPriority(GetCurrentThread());
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switch (sys_priority)
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{
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case THREAD_PRIORITY_HIGHEST:
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case THREAD_PRIORITY_TIME_CRITICAL:
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case THREAD_PRIORITY_ABOVE_NORMAL:
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case THREAD_PRIORITY_NORMAL:
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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default:
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case THREAD_PRIORITY_BELOW_NORMAL:
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return OBJC_THREAD_BACKGROUND_PRIORITY;
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case THREAD_PRIORITY_IDLE:
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case THREAD_PRIORITY_LOWEST:
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return OBJC_THREAD_LOW_PRIORITY;
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}
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/* Couldn't get priority. */
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return -1;
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}
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/* Yield our process time to another thread. */
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void
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__objc_thread_yield(void)
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{
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Sleep(0);
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}
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/* Terminate the current thread. */
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int
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__objc_thread_exit(void)
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{
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/* exit the thread */
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ExitThread(__objc_thread_exit_status);
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/* Failed if we reached here */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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objc_thread_t
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__objc_thread_id(void)
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{
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return (objc_thread_t)GetCurrentThreadId();
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}
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/* Sets the thread's local storage pointer. */
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int
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__objc_thread_set_data(void *value)
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{
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if (TlsSetValue(__objc_data_tls, value))
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return 0;
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else
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return -1;
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}
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/* Returns the thread's local storage pointer. */
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void *
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__objc_thread_get_data(void)
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{
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return TlsGetValue(__objc_data_tls); /* Return thread data. */
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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int
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__objc_mutex_allocate(objc_mutex_t mutex)
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{
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if ((mutex->backend = (void *)CreateMutex(NULL, 0, NULL)) == NULL)
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return -1;
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else
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return 0;
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}
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/* Deallocate a mutex. */
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int
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__objc_mutex_deallocate(objc_mutex_t mutex)
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{
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CloseHandle((HANDLE)(mutex->backend));
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return 0;
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}
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/* Grab a lock on a mutex. */
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int
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__objc_mutex_lock(objc_mutex_t mutex)
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{
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int status;
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status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE);
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if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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return -1;
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else
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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int
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__objc_mutex_trylock(objc_mutex_t mutex)
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{
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int status;
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status = WaitForSingleObject((HANDLE)(mutex->backend), 0);
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if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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return -1;
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else
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return 0;
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}
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/* Unlock the mutex */
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int
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__objc_mutex_unlock(objc_mutex_t mutex)
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{
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if (ReleaseMutex((HANDLE)(mutex->backend)) == 0)
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return -1;
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else
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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int
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__objc_condition_allocate(objc_condition_t condition)
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{
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/* Unimplemented. */
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return -1;
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}
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/* Deallocate a condition. */
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int
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__objc_condition_deallocate(objc_condition_t condition)
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wait on the condition */
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int
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__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wake up all threads waiting on this condition. */
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int
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__objc_condition_broadcast(objc_condition_t condition)
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wake up one thread waiting on this condition. */
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int
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__objc_condition_signal(objc_condition_t condition)
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{
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/* Unimplemented. */
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return -1;
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}
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/* End of File */
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