1 /*

     2     SDL - Simple DirectMedia Layer

     3     Copyright (C) 1997-2009 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@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 #elif __GNUC__

    72 typedef unsigned long (__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 #else

    77 typedef uintptr_t (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned,

    78         unsigned (__stdcall *func)(void *), void *arg, 

    79         unsigned, unsigned *threadID);

    80 typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code);

    81 #endif

    82 

    83 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data, pfnSDL_CurrentBeginThread pfnBeginThread, pfnSDL_CurrentEndThread pfnEndThread);

    84 

    85 #ifdef __OS2__

    86 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthread, _endthread)

    87 #elif defined(_WIN32_WCE)

    88 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, NULL, NULL)

    89 #else

    90 #define SDL_CreateThread(fn, data) SDL_CreateThread(fn, data, _beginthreadex, _endthreadex)

    91 #endif

    92 #else

    93 extern DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(int (SDLCALL *fn)(void *), void *data);

    94 #endif

    95 

    96 /** Get the 32-bit thread identifier for the current thread */

    97 extern DECLSPEC Uint32 SDLCALL SDL_ThreadID(void);

    98 

    99 /** Get the 32-bit thread identifier for the specified thread,

   100  *  equivalent to SDL_ThreadID() if the specified thread is NULL.

   101  */

   102 extern DECLSPEC Uint32 SDLCALL SDL_GetThreadID(SDL_Thread *thread);

   103 

   104 /** Wait for a thread to finish.

   105  *  The return code for the thread function is placed in the area

   106  *  pointed to by 'status', if 'status' is not NULL.

   107  */

   108 extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status);

   109 

   110 /** Forcefully kill a thread without worrying about its state */

   111 extern DECLSPEC void SDLCALL SDL_KillThread(SDL_Thread *thread);

   112 

   113 

   114 /* Ends C function definitions when using C++ */

   115 #ifdef __cplusplus

   116 }

   117 #endif

   118 #include "close_code.h"

   119 

   120 #endif /* _SDL_thread_h */