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361 lines
13 KiB
361 lines
13 KiB
/* |
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Simple DirectMedia Layer |
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
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This software is provided 'as-is', without any express or implied |
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warranty. In no event will the authors be held liable for any damages |
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arising from the use of this software. |
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Permission is granted to anyone to use this software for any purpose, |
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including commercial applications, and to alter it and redistribute it |
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freely, subject to the following restrictions: |
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1. The origin of this software must not be misrepresented; you must not |
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claim that you wrote the original software. If you use this software |
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in a product, an acknowledgment in the product documentation would be |
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appreciated but is not required. |
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2. Altered source versions must be plainly marked as such, and must not be |
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misrepresented as being the original software. |
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3. This notice may not be removed or altered from any source distribution. |
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*/ |
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#ifndef SDL_thread_h_ |
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#define SDL_thread_h_ |
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/** |
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* \file SDL_thread.h |
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* |
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* Header for the SDL thread management routines. |
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*/ |
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#include "SDL_stdinc.h" |
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#include "SDL_error.h" |
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/* Thread synchronization primitives */ |
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#include "SDL_atomic.h" |
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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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/* The SDL thread ID */ |
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typedef unsigned long SDL_threadID; |
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/* Thread local storage ID, 0 is the invalid ID */ |
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typedef unsigned int SDL_TLSID; |
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/** |
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* The SDL thread priority. |
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* |
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* \note On many systems you require special privileges to set high or time critical priority. |
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*/ |
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typedef enum { |
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SDL_THREAD_PRIORITY_LOW, |
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SDL_THREAD_PRIORITY_NORMAL, |
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SDL_THREAD_PRIORITY_HIGH, |
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SDL_THREAD_PRIORITY_TIME_CRITICAL |
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} SDL_ThreadPriority; |
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/** |
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* The function passed to SDL_CreateThread(). |
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* It is passed a void* user context parameter and returns an int. |
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*/ |
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typedef int (SDLCALL * SDL_ThreadFunction) (void *data); |
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#if defined(__WIN32__) |
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/** |
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* \file SDL_thread.h |
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* |
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* We compile SDL into a DLL. 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 SDL2.DLL will |
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* be initialized for those threads, and not the RTL of the calling |
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* application! |
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* |
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* To solve this, we make a little hack here. |
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* |
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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 SDL2.DLL which uses this API, |
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* then the RTL of SDL2.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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* |
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* So, in short: |
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* Always use the _beginthread() and _endthread() of the calling runtime |
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* library! |
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*/ |
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#define SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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#include <process.h> /* _beginthreadex() and _endthreadex() */ |
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typedef uintptr_t (__cdecl * pfnSDL_CurrentBeginThread) |
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(void *, unsigned, unsigned (__stdcall *func)(void *), |
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void * /*arg*/, unsigned, unsigned * /* threadID */); |
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typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code); |
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#ifndef SDL_beginthread |
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#define SDL_beginthread _beginthreadex |
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#endif |
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#ifndef SDL_endthread |
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#define SDL_endthread _endthreadex |
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#endif |
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/** |
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* Create a thread. |
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*/ |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data, |
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pfnSDL_CurrentBeginThread pfnBeginThread, |
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pfnSDL_CurrentEndThread pfnEndThread); |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThreadWithStackSize(int (SDLCALL * fn) (void *), |
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const char *name, const size_t stacksize, void *data, |
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pfnSDL_CurrentBeginThread pfnBeginThread, |
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pfnSDL_CurrentEndThread pfnEndThread); |
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/** |
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* Create a thread. |
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*/ |
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#if defined(SDL_CreateThread) && SDL_DYNAMIC_API |
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#undef SDL_CreateThread |
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#define SDL_CreateThread(fn, name, data) SDL_CreateThread_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#undef SDL_CreateThreadWithStackSize |
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#define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize_REAL(fn, name, stacksize, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#else |
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#define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize(fn, name, data, (pfnSDL_CurrentBeginThread)_beginthreadex, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#endif |
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#elif defined(__OS2__) |
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/* |
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* just like the windows case above: We compile SDL2 |
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* into a dll with Watcom's runtime statically linked. |
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*/ |
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#define SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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#ifndef __EMX__ |
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#include <process.h> |
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#else |
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#include <stdlib.h> |
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#endif |
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typedef int (*pfnSDL_CurrentBeginThread)(void (*func)(void *), void *, unsigned, void * /*arg*/); |
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typedef void (*pfnSDL_CurrentEndThread)(void); |
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#ifndef SDL_beginthread |
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#define SDL_beginthread _beginthread |
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#endif |
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#ifndef SDL_endthread |
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#define SDL_endthread _endthread |
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#endif |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data, |
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pfnSDL_CurrentBeginThread pfnBeginThread, |
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pfnSDL_CurrentEndThread pfnEndThread); |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn, const char *name, const size_t stacksize, void *data, |
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pfnSDL_CurrentBeginThread pfnBeginThread, |
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pfnSDL_CurrentEndThread pfnEndThread); |
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#if defined(SDL_CreateThread) && SDL_DYNAMIC_API |
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#undef SDL_CreateThread |
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#define SDL_CreateThread(fn, name, data) SDL_CreateThread_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#undef SDL_CreateThreadWithStackSize |
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#define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#else |
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#define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize(fn, name, stacksize, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
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#endif |
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#else |
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/** |
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* Create a thread with a default stack size. |
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* |
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* This is equivalent to calling: |
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* SDL_CreateThreadWithStackSize(fn, name, 0, data); |
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*/ |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data); |
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/** |
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* Create a thread. |
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* |
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* Thread naming is a little complicated: Most systems have very small |
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* limits for the string length (Haiku has 32 bytes, Linux currently has 16, |
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* Visual C++ 6.0 has nine!), and possibly other arbitrary rules. You'll |
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* have to see what happens with your system's debugger. The name should be |
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* UTF-8 (but using the naming limits of C identifiers is a better bet). |
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* There are no requirements for thread naming conventions, so long as the |
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* string is null-terminated UTF-8, but these guidelines are helpful in |
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* choosing a name: |
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* |
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* http://stackoverflow.com/questions/149932/naming-conventions-for-threads |
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* |
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* If a system imposes requirements, SDL will try to munge the string for |
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* it (truncate, etc), but the original string contents will be available |
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* from SDL_GetThreadName(). |
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* |
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* The size (in bytes) of the new stack can be specified. Zero means "use |
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* the system default" which might be wildly different between platforms |
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* (x86 Linux generally defaults to eight megabytes, an embedded device |
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* might be a few kilobytes instead). |
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* |
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* In SDL 2.1, stacksize will be folded into the original SDL_CreateThread |
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* function. |
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*/ |
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extern DECLSPEC SDL_Thread *SDLCALL |
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SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn, const char *name, const size_t stacksize, void *data); |
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#endif |
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/** |
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* Get the thread name, as it was specified in SDL_CreateThread(). |
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* This function returns a pointer to a UTF-8 string that names the |
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* specified thread, or NULL if it doesn't have a name. This is internal |
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* memory, not to be free()'d by the caller, and remains valid until the |
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* specified thread is cleaned up by SDL_WaitThread(). |
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*/ |
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extern DECLSPEC const char *SDLCALL SDL_GetThreadName(SDL_Thread *thread); |
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/** |
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* Get the thread identifier for the current thread. |
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*/ |
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extern DECLSPEC SDL_threadID SDLCALL SDL_ThreadID(void); |
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/** |
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* Get the thread identifier for the specified thread. |
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* |
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* Equivalent to SDL_ThreadID() if the specified thread is NULL. |
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*/ |
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extern DECLSPEC SDL_threadID SDLCALL SDL_GetThreadID(SDL_Thread * thread); |
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/** |
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* Set the priority for the current thread |
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*/ |
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extern DECLSPEC int SDLCALL SDL_SetThreadPriority(SDL_ThreadPriority priority); |
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/** |
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* Wait for a thread to finish. Threads that haven't been detached will |
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* remain (as a "zombie") until this function cleans them up. Not doing so |
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* is a resource leak. |
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* |
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* Once a thread has been cleaned up through this function, the SDL_Thread |
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* that references it becomes invalid and should not be referenced again. |
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* As such, only one thread may call SDL_WaitThread() on another. |
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* |
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* The return code for the thread function is placed in the area |
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* pointed to by \c status, if \c status is not NULL. |
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* |
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* You may not wait on a thread that has been used in a call to |
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* SDL_DetachThread(). Use either that function or this one, but not |
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* both, or behavior is undefined. |
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* |
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* It is safe to pass NULL to this function; it is a no-op. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread * thread, int *status); |
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/** |
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* A thread may be "detached" to signify that it should not remain until |
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* another thread has called SDL_WaitThread() on it. Detaching a thread |
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* is useful for long-running threads that nothing needs to synchronize |
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* with or further manage. When a detached thread is done, it simply |
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* goes away. |
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* |
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* There is no way to recover the return code of a detached thread. If you |
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* need this, don't detach the thread and instead use SDL_WaitThread(). |
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* |
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* Once a thread is detached, you should usually assume the SDL_Thread isn't |
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* safe to reference again, as it will become invalid immediately upon |
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* the detached thread's exit, instead of remaining until someone has called |
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* SDL_WaitThread() to finally clean it up. As such, don't detach the same |
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* thread more than once. |
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* |
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* If a thread has already exited when passed to SDL_DetachThread(), it will |
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* stop waiting for a call to SDL_WaitThread() and clean up immediately. |
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* It is not safe to detach a thread that might be used with SDL_WaitThread(). |
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* |
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* You may not call SDL_WaitThread() on a thread that has been detached. |
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* Use either that function or this one, but not both, or behavior is |
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* undefined. |
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* |
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* It is safe to pass NULL to this function; it is a no-op. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_DetachThread(SDL_Thread * thread); |
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/** |
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* \brief Create an identifier that is globally visible to all threads but refers to data that is thread-specific. |
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* |
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* \return The newly created thread local storage identifier, or 0 on error |
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* |
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* \code |
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* static SDL_SpinLock tls_lock; |
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* static SDL_TLSID thread_local_storage; |
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* |
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* void SetMyThreadData(void *value) |
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* { |
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* if (!thread_local_storage) { |
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* SDL_AtomicLock(&tls_lock); |
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* if (!thread_local_storage) { |
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* thread_local_storage = SDL_TLSCreate(); |
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* } |
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* SDL_AtomicUnlock(&tls_lock); |
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* } |
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* SDL_TLSSet(thread_local_storage, value, 0); |
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* } |
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* |
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* void *GetMyThreadData(void) |
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* { |
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* return SDL_TLSGet(thread_local_storage); |
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* } |
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* \endcode |
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* |
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* \sa SDL_TLSGet() |
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* \sa SDL_TLSSet() |
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*/ |
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extern DECLSPEC SDL_TLSID SDLCALL SDL_TLSCreate(void); |
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/** |
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* \brief Get the value associated with a thread local storage ID for the current thread. |
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* |
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* \param id The thread local storage ID |
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* |
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* \return The value associated with the ID for the current thread, or NULL if no value has been set. |
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* |
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* \sa SDL_TLSCreate() |
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* \sa SDL_TLSSet() |
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*/ |
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extern DECLSPEC void * SDLCALL SDL_TLSGet(SDL_TLSID id); |
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/** |
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* \brief Set the value associated with a thread local storage ID for the current thread. |
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* |
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* \param id The thread local storage ID |
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* \param value The value to associate with the ID for the current thread |
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* \param destructor A function called when the thread exits, to free the value. |
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* |
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* \return 0 on success, -1 on error |
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* |
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* \sa SDL_TLSCreate() |
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* \sa SDL_TLSGet() |
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*/ |
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extern DECLSPEC int SDLCALL SDL_TLSSet(SDL_TLSID id, const void *value, void (SDLCALL *destructor)(void*)); |
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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_ */ |
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/* vi: set ts=4 sw=4 expandtab: */
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