| | |
| | | /* |
| | | Simple DirectMedia Layer |
| | | Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> |
| | | Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
| | | |
| | | This software is provided 'as-is', without any express or implied |
| | | warranty. In no event will the authors be held liable for any damages |
| | |
| | | 3. This notice may not be removed or altered from any source distribution. |
| | | */ |
| | | |
| | | #ifndef _SDL_thread_h |
| | | #define _SDL_thread_h |
| | | #ifndef SDL_thread_h_ |
| | | #define SDL_thread_h_ |
| | | |
| | | /** |
| | | * \file SDL_thread.h |
| | |
| | | #include "SDL_error.h" |
| | | |
| | | /* Thread synchronization primitives */ |
| | | #include "SDL_atomic.h" |
| | | #include "SDL_mutex.h" |
| | | |
| | | #include "begin_code.h" |
| | |
| | | /* The SDL thread ID */ |
| | | typedef unsigned long SDL_threadID; |
| | | |
| | | /* The SDL thread priority |
| | | /* Thread local storage ID, 0 is the invalid ID */ |
| | | typedef unsigned int SDL_TLSID; |
| | | |
| | | /** |
| | | * The SDL thread priority. |
| | | * |
| | | * Note: On many systems you require special privileges to set high priority. |
| | | * \note On many systems you require special privileges to set high or time critical priority. |
| | | */ |
| | | typedef enum { |
| | | SDL_THREAD_PRIORITY_LOW, |
| | | SDL_THREAD_PRIORITY_NORMAL, |
| | | SDL_THREAD_PRIORITY_HIGH |
| | | SDL_THREAD_PRIORITY_HIGH, |
| | | SDL_THREAD_PRIORITY_TIME_CRITICAL |
| | | } SDL_ThreadPriority; |
| | | |
| | | /* The function passed to SDL_CreateThread() |
| | | It is passed a void* user context parameter and returns an int. |
| | | /** |
| | | * The function passed to SDL_CreateThread(). |
| | | * It is passed a void* user context parameter and returns an int. |
| | | */ |
| | | typedef int (SDLCALL * SDL_ThreadFunction) (void *data); |
| | | |
| | | #if defined(__WIN32__) && !defined(HAVE_LIBC) |
| | | #if defined(__WIN32__) |
| | | /** |
| | | * \file SDL_thread.h |
| | | * |
| | | * We compile SDL into a DLL. This means, that it's the DLL which |
| | | * creates a new thread for the calling process with the SDL_CreateThread() |
| | | * API. There is a problem with this, that only the RTL of the SDL.DLL will |
| | | * API. There is a problem with this, that only the RTL of the SDL2.DLL will |
| | | * be initialized for those threads, and not the RTL of the calling |
| | | * application! |
| | | * |
| | | * To solve this, we make a little hack here. |
| | | * |
| | | * We'll always use the caller's _beginthread() and _endthread() APIs to |
| | | * start a new thread. This way, if it's the SDL.DLL which uses this API, |
| | | * then the RTL of SDL.DLL will be used to create the new thread, and if it's |
| | | * start a new thread. This way, if it's the SDL2.DLL which uses this API, |
| | | * then the RTL of SDL2.DLL will be used to create the new thread, and if it's |
| | | * the application, then the RTL of the application will be used. |
| | | * |
| | | * So, in short: |
| | |
| | | * library! |
| | | */ |
| | | #define SDL_PASSED_BEGINTHREAD_ENDTHREAD |
| | | #include <process.h> /* This has _beginthread() and _endthread() defined! */ |
| | | #include <process.h> /* _beginthreadex() and _endthreadex() */ |
| | | |
| | | typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned, |
| | | unsigned (__stdcall * |
| | | func) (void |
| | | *), |
| | | void *arg, unsigned, |
| | | unsigned *threadID); |
| | | typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) |
| | | (void *, unsigned, unsigned (__stdcall *func)(void *), |
| | | void * /*arg*/, unsigned, unsigned * /* threadID */); |
| | | typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code); |
| | | |
| | | #ifndef SDL_beginthread |
| | | #define SDL_beginthread _beginthreadex |
| | | #endif |
| | | #ifndef SDL_endthread |
| | | #define SDL_endthread _endthreadex |
| | | #endif |
| | | |
| | | /** |
| | | * Create a thread. |
| | |
| | | pfnSDL_CurrentBeginThread pfnBeginThread, |
| | | pfnSDL_CurrentEndThread pfnEndThread); |
| | | |
| | | extern DECLSPEC SDL_Thread *SDLCALL |
| | | SDL_CreateThreadWithStackSize(int (SDLCALL * fn) (void *), |
| | | const char *name, const size_t stacksize, void *data, |
| | | pfnSDL_CurrentBeginThread pfnBeginThread, |
| | | pfnSDL_CurrentEndThread pfnEndThread); |
| | | |
| | | |
| | | /** |
| | | * Create a thread. |
| | | */ |
| | | #define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, _beginthreadex, _endthreadex) |
| | | #if defined(SDL_CreateThread) && SDL_DYNAMIC_API |
| | | #undef SDL_CreateThread |
| | | #define SDL_CreateThread(fn, name, data) SDL_CreateThread_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #undef SDL_CreateThreadWithStackSize |
| | | #define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize_REAL(fn, name, stacksize, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #else |
| | | #define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize(fn, name, data, (pfnSDL_CurrentBeginThread)_beginthreadex, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #endif |
| | | |
| | | #elif defined(__OS2__) |
| | | /* |
| | | * just like the windows case above: We compile SDL2 |
| | | * into a dll with Watcom's runtime statically linked. |
| | | */ |
| | | #define SDL_PASSED_BEGINTHREAD_ENDTHREAD |
| | | |
| | | #ifndef __EMX__ |
| | | #include <process.h> |
| | | #else |
| | | #include <stdlib.h> |
| | | #endif |
| | | |
| | | typedef int (*pfnSDL_CurrentBeginThread)(void (*func)(void *), void *, unsigned, void * /*arg*/); |
| | | typedef void (*pfnSDL_CurrentEndThread)(void); |
| | | |
| | | #ifndef SDL_beginthread |
| | | #define SDL_beginthread _beginthread |
| | | #endif |
| | | #ifndef SDL_endthread |
| | | #define SDL_endthread _endthread |
| | | #endif |
| | | |
| | | extern DECLSPEC SDL_Thread *SDLCALL |
| | | SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data, |
| | | pfnSDL_CurrentBeginThread pfnBeginThread, |
| | | pfnSDL_CurrentEndThread pfnEndThread); |
| | | extern DECLSPEC SDL_Thread *SDLCALL |
| | | SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn, const char *name, const size_t stacksize, void *data, |
| | | pfnSDL_CurrentBeginThread pfnBeginThread, |
| | | pfnSDL_CurrentEndThread pfnEndThread); |
| | | |
| | | #if defined(SDL_CreateThread) && SDL_DYNAMIC_API |
| | | #undef SDL_CreateThread |
| | | #define SDL_CreateThread(fn, name, data) SDL_CreateThread_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #undef SDL_CreateThreadWithStackSize |
| | | #define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #else |
| | | #define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #define SDL_CreateThreadWithStackSize(fn, name, stacksize, data) SDL_CreateThreadWithStackSize(fn, name, stacksize, data, (pfnSDL_CurrentBeginThread)SDL_beginthread, (pfnSDL_CurrentEndThread)SDL_endthread) |
| | | #endif |
| | | |
| | | #else |
| | | |
| | | /** |
| | | * Create a thread with a default stack size. |
| | | * |
| | | * This is equivalent to calling: |
| | | * SDL_CreateThreadWithStackSize(fn, name, 0, data); |
| | | */ |
| | | extern DECLSPEC SDL_Thread *SDLCALL |
| | | SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data); |
| | | |
| | | /** |
| | | * Create a thread. |
| | | * |
| | | * Thread naming is a little complicated: Most systems have very small |
| | | * limits for the string length (BeOS has 32 bytes, Linux currently has 16, |
| | | * limits for the string length (Haiku has 32 bytes, Linux currently has 16, |
| | | * Visual C++ 6.0 has nine!), and possibly other arbitrary rules. You'll |
| | | * have to see what happens with your system's debugger. The name should be |
| | | * UTF-8 (but using the naming limits of C identifiers is a better bet). |
| | |
| | | * If a system imposes requirements, SDL will try to munge the string for |
| | | * it (truncate, etc), but the original string contents will be available |
| | | * from SDL_GetThreadName(). |
| | | * |
| | | * The size (in bytes) of the new stack can be specified. Zero means "use |
| | | * the system default" which might be wildly different between platforms |
| | | * (x86 Linux generally defaults to eight megabytes, an embedded device |
| | | * might be a few kilobytes instead). |
| | | * |
| | | * In SDL 2.1, stacksize will be folded into the original SDL_CreateThread |
| | | * function. |
| | | */ |
| | | extern DECLSPEC SDL_Thread *SDLCALL |
| | | SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data); |
| | | SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn, const char *name, const size_t stacksize, void *data); |
| | | |
| | | #endif |
| | | |
| | |
| | | extern DECLSPEC int SDLCALL SDL_SetThreadPriority(SDL_ThreadPriority priority); |
| | | |
| | | /** |
| | | * Wait for a thread to finish. |
| | | * Wait for a thread to finish. Threads that haven't been detached will |
| | | * remain (as a "zombie") until this function cleans them up. Not doing so |
| | | * is a resource leak. |
| | | * |
| | | * Once a thread has been cleaned up through this function, the SDL_Thread |
| | | * that references it becomes invalid and should not be referenced again. |
| | | * As such, only one thread may call SDL_WaitThread() on another. |
| | | * |
| | | * The return code for the thread function is placed in the area |
| | | * pointed to by \c status, if \c status is not NULL. |
| | | * |
| | | * You may not wait on a thread that has been used in a call to |
| | | * SDL_DetachThread(). Use either that function or this one, but not |
| | | * both, or behavior is undefined. |
| | | * |
| | | * It is safe to pass NULL to this function; it is a no-op. |
| | | */ |
| | | extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread * thread, int *status); |
| | | |
| | | /** |
| | | * A thread may be "detached" to signify that it should not remain until |
| | | * another thread has called SDL_WaitThread() on it. Detaching a thread |
| | | * is useful for long-running threads that nothing needs to synchronize |
| | | * with or further manage. When a detached thread is done, it simply |
| | | * goes away. |
| | | * |
| | | * There is no way to recover the return code of a detached thread. If you |
| | | * need this, don't detach the thread and instead use SDL_WaitThread(). |
| | | * |
| | | * Once a thread is detached, you should usually assume the SDL_Thread isn't |
| | | * safe to reference again, as it will become invalid immediately upon |
| | | * the detached thread's exit, instead of remaining until someone has called |
| | | * SDL_WaitThread() to finally clean it up. As such, don't detach the same |
| | | * thread more than once. |
| | | * |
| | | * If a thread has already exited when passed to SDL_DetachThread(), it will |
| | | * stop waiting for a call to SDL_WaitThread() and clean up immediately. |
| | | * It is not safe to detach a thread that might be used with SDL_WaitThread(). |
| | | * |
| | | * You may not call SDL_WaitThread() on a thread that has been detached. |
| | | * Use either that function or this one, but not both, or behavior is |
| | | * undefined. |
| | | * |
| | | * It is safe to pass NULL to this function; it is a no-op. |
| | | */ |
| | | extern DECLSPEC void SDLCALL SDL_DetachThread(SDL_Thread * thread); |
| | | |
| | | /** |
| | | * \brief Create an identifier that is globally visible to all threads but refers to data that is thread-specific. |
| | | * |
| | | * \return The newly created thread local storage identifier, or 0 on error |
| | | * |
| | | * \code |
| | | * static SDL_SpinLock tls_lock; |
| | | * static SDL_TLSID thread_local_storage; |
| | | * |
| | | * void SetMyThreadData(void *value) |
| | | * { |
| | | * if (!thread_local_storage) { |
| | | * SDL_AtomicLock(&tls_lock); |
| | | * if (!thread_local_storage) { |
| | | * thread_local_storage = SDL_TLSCreate(); |
| | | * } |
| | | * SDL_AtomicUnlock(&tls_lock); |
| | | * } |
| | | * SDL_TLSSet(thread_local_storage, value, 0); |
| | | * } |
| | | * |
| | | * void *GetMyThreadData(void) |
| | | * { |
| | | * return SDL_TLSGet(thread_local_storage); |
| | | * } |
| | | * \endcode |
| | | * |
| | | * \sa SDL_TLSGet() |
| | | * \sa SDL_TLSSet() |
| | | */ |
| | | extern DECLSPEC SDL_TLSID SDLCALL SDL_TLSCreate(void); |
| | | |
| | | /** |
| | | * \brief Get the value associated with a thread local storage ID for the current thread. |
| | | * |
| | | * \param id The thread local storage ID |
| | | * |
| | | * \return The value associated with the ID for the current thread, or NULL if no value has been set. |
| | | * |
| | | * \sa SDL_TLSCreate() |
| | | * \sa SDL_TLSSet() |
| | | */ |
| | | extern DECLSPEC void * SDLCALL SDL_TLSGet(SDL_TLSID id); |
| | | |
| | | /** |
| | | * \brief Set the value associated with a thread local storage ID for the current thread. |
| | | * |
| | | * \param id The thread local storage ID |
| | | * \param value The value to associate with the ID for the current thread |
| | | * \param destructor A function called when the thread exits, to free the value. |
| | | * |
| | | * \return 0 on success, -1 on error |
| | | * |
| | | * \sa SDL_TLSCreate() |
| | | * \sa SDL_TLSGet() |
| | | */ |
| | | extern DECLSPEC int SDLCALL SDL_TLSSet(SDL_TLSID id, const void *value, void (SDLCALL *destructor)(void*)); |
| | | |
| | | |
| | | /* Ends C function definitions when using C++ */ |
| | |
| | | #endif |
| | | #include "close_code.h" |
| | | |
| | | #endif /* _SDL_thread_h */ |
| | | #endif /* SDL_thread_h_ */ |
| | | |
| | | /* vi: set ts=4 sw=4 expandtab: */ |