include/SDL_thread.h
author Sam Lantinga <slouken@libsdl.org>
Mon, 06 Feb 2006 08:28:51 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifndef _SDL_thread_h
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#define _SDL_thread_h
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/* Header for the SDL thread management routines 
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	These are independent of the other SDL routines.
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*/
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#include "SDL_main.h"
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#include "SDL_types.h"
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/* Thread synchronization primitives */
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#include "SDL_mutex.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* The SDL thread structure, defined in SDL_thread.c */
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struct SDL_Thread;
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typedef struct SDL_Thread SDL_Thread;
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/* Create a thread */
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#if defined(_WIN32) || defined(__OS2__)
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/*
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   We compile SDL into a DLL on OS/2. This means, that it's the DLL which
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   creates a new thread for the calling process with the SDL_CreateThread()
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   API. There is a problem with this, that only the RTL of the SDL.DLL will
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   be initialized for those threads, and not the RTL of the calling application!
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   To solve this, we make a little hack here.
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   We'll always use the caller's _beginthread() and _endthread() APIs to
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   start a new thread. This way, if it's the SDL.DLL which uses this API,
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   then the RTL of SDL.DLL will be used to create the new thread, and if it's
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   the application, then the RTL of the application will be used.
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   So, in short:
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   Always use the _beginthread() and _endthread() of the calling runtime library!
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*/
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#include <process.h> // This has _beginthread() and _endthread() defined!
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#ifdef __EMX__
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#include <stdlib.h> // This has _beginthread() and _endthread() defined, if -Zmt flag is used!
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#endif
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#ifdef __OS2__
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typedef int (__cdecl *pfnSDL_CurrentBeginThread)(void (*func)(void *), void *, unsigned, void *arg); 
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typedef void (__cdecl *pfnSDL_CurrentEndThread)(void);
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#else
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#ifdef __GNUC__
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#include <stdint.h>
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#endif
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typedef uintptr_t (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned,
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        unsigned (__stdcall *func)(void *), void *arg, 
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        unsigned, unsigned *threadID);
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typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code);
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#endif
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extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (*fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread);
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#ifdef __OS2__
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#define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthread, _endthread)
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#elif defined(_WIN32_WCE)
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#define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL)
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#else
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#define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex)
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#endif
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#else
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extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data);
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#endif
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/* Get the 32-bit thread identifier for the current thread */
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extern DECLSPEC Uint32 SDLCALL SDL_ThreadID(void);
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/* Get the 32-bit thread identifier for the specified thread,
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   equivalent to SDL_ThreadID() if the specified thread is NULL.
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 */
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extern DECLSPEC Uint32 SDLCALL SDL_GetThreadID(SDL_Thread *thread);
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/* Wait for a thread to finish.
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   The return code for the thread function is placed in the area
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   pointed to by 'status', if 'status' is not NULL.
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 */
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extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status);
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/* Forcefully kill a thread without worrying about its state */
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extern DECLSPEC void SDLCALL SDL_KillThread(SDL_Thread *thread);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* _SDL_thread_h */