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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 
     23 #ifndef _SDL_thread_h
     24 #define _SDL_thread_h
     25 
     26 /** @file SDL_thread.h
     27  *  Header for the SDL thread management routines
     28  *
     29  *  @note These are independent of the other SDL routines.
     30  */
     31 
     32 #include "SDL_stdinc.h"
     33 #include "SDL_error.h"
     34 
     35 /* Thread synchronization primitives */
     36 #include "SDL_mutex.h"
     37 
     38 #include "begin_code.h"
     39 /* Set up for C function definitions, even when using C++ */
     40 #ifdef __cplusplus
     41 extern "C" {
     42 #endif
     43 
     44 /** The SDL thread structure, defined in SDL_thread.c */
     45 struct SDL_Thread;
     46 typedef struct SDL_Thread SDL_Thread;
     47 
     48 /** Create a thread */
     49 #if ((defined(__WIN32__) && !defined(HAVE_LIBC)) || defined(__OS2__)) &&  !defined(__SYMBIAN32__)
     50 /**
     51  *  We compile SDL into a DLL on OS/2. This means, that it's the DLL which
     52  *  creates a new thread for the calling process with the SDL_CreateThread()
     53  *  API. There is a problem with this, that only the RTL of the SDL.DLL will
     54  *  be initialized for those threads, and not the RTL of the calling application!
     55  *  To solve this, we make a little hack here.
     56  *  We'll always use the caller's _beginthread() and _endthread() APIs to
     57  *  start a new thread. This way, if it's the SDL.DLL which uses this API,
     58  *  then the RTL of SDL.DLL will be used to create the new thread, and if it's
     59  *  the application, then the RTL of the application will be used.
     60  *  So, in short:
     61  *  Always use the _beginthread() and _endthread() of the calling runtime library!
     62  */
     63 #define SDL_PASSED_BEGINTHREAD_ENDTHREAD
     64 #ifndef _WIN32_WCE
     65 #include <process.h> /* This has _beginthread() and _endthread() defined! */
     66 #endif
     67 
     68 #ifdef __OS2__
     69 typedef int (*pfnSDL_CurrentBeginThread)(void (*func)(void *), void *, unsigned, void *arg);
     70 typedef void (*pfnSDL_CurrentEndThread)(void);
     71 #else
     72 typedef uintptr_t (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned,
     73         unsigned (__stdcall *func)(void *), void *arg,
     74         unsigned, unsigned *threadID);
     75 typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code);
     76 #endif
     77 
     78 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread);
     79 
     80 #ifdef __OS2__
     81 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthread, _endthread)
     82 #elif defined(_WIN32_WCE)
     83 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL)
     84 #else
     85 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex)
     86 #endif
     87 #else
     88 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data);
     89 #endif
     90 
     91 /** Get the 32-bit thread identifier for the current thread */
     92 extern DECLSPEC Uint32 SDLCALL SDL_ThreadID(void);
     93 
     94 /** Get the 32-bit thread identifier for the specified thread,
     95  *  equivalent to SDL_ThreadID() if the specified thread is NULL.
     96  */
     97 extern DECLSPEC Uint32 SDLCALL SDL_GetThreadID(SDL_Thread *thread);
     98 
     99 /** Wait for a thread to finish.
    100  *  The return code for the thread function is placed in the area
    101  *  pointed to by 'status', if 'status' is not NULL.
    102  */
    103 extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status);
    104 
    105 /** Forcefully kill a thread without worrying about its state */
    106 extern DECLSPEC void SDLCALL SDL_KillThread(SDL_Thread *thread);
    107 
    108 
    109 /* Ends C function definitions when using C++ */
    110 #ifdef __cplusplus
    111 }
    112 #endif
    113 #include "close_code.h"
    114 
    115 #endif /* _SDL_thread_h */
    116