You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
287 lines
9.9 KiB
287 lines
9.9 KiB
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2014 Sam Lantinga <[email protected]>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#ifndef _SDL_thread_h
|
|
#define _SDL_thread_h
|
|
|
|
/**
|
|
* \file SDL_thread.h
|
|
*
|
|
* Header for the SDL thread management routines.
|
|
*/
|
|
|
|
#include "SDL_stdinc.h"
|
|
#include "SDL_error.h"
|
|
|
|
/* Thread synchronization primitives */
|
|
#include "SDL_atomic.h"
|
|
#include "SDL_mutex.h"
|
|
|
|
#include "begin_code.h"
|
|
/* Set up for C function definitions, even when using C++ */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* The SDL thread structure, defined in SDL_thread.c */
|
|
struct SDL_Thread;
|
|
typedef struct SDL_Thread SDL_Thread;
|
|
|
|
/* The SDL thread ID */
|
|
typedef unsigned long SDL_threadID;
|
|
|
|
/* 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.
|
|
*/
|
|
typedef enum {
|
|
SDL_THREAD_PRIORITY_LOW,
|
|
SDL_THREAD_PRIORITY_NORMAL,
|
|
SDL_THREAD_PRIORITY_HIGH
|
|
} SDL_ThreadPriority;
|
|
|
|
/**
|
|
* 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)
|
|
/**
|
|
* \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
|
|
* 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
|
|
* the application, then the RTL of the application will be used.
|
|
*
|
|
* So, in short:
|
|
* Always use the _beginthread() and _endthread() of the calling runtime
|
|
* library!
|
|
*/
|
|
#define SDL_PASSED_BEGINTHREAD_ENDTHREAD
|
|
#include <process.h> /* This has _beginthread() and _endthread() defined! */
|
|
|
|
typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
|
|
unsigned (__stdcall *
|
|
func) (void
|
|
*),
|
|
void *arg, unsigned,
|
|
unsigned *threadID);
|
|
typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
|
|
|
|
/**
|
|
* Create a thread.
|
|
*/
|
|
extern DECLSPEC SDL_Thread *SDLCALL
|
|
SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data,
|
|
pfnSDL_CurrentBeginThread pfnBeginThread,
|
|
pfnSDL_CurrentEndThread pfnEndThread);
|
|
|
|
/**
|
|
* Create a thread.
|
|
*/
|
|
#if defined(SDL_CreateThread) && SDL_DYNAMIC_API
|
|
#undef SDL_CreateThread
|
|
#define SDL_CreateThread(fn, name, data) SDL_CreateThread_REAL(fn, name, data, (pfnSDL_CurrentBeginThread)_beginthreadex, (pfnSDL_CurrentEndThread)_endthreadex)
|
|
#else
|
|
#define SDL_CreateThread(fn, name, data) SDL_CreateThread(fn, name, data, (pfnSDL_CurrentBeginThread)_beginthreadex, (pfnSDL_CurrentEndThread)_endthreadex)
|
|
#endif
|
|
|
|
#else
|
|
|
|
/**
|
|
* Create a thread.
|
|
*
|
|
* Thread naming is a little complicated: Most systems have very small
|
|
* 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).
|
|
* There are no requirements for thread naming conventions, so long as the
|
|
* string is null-terminated UTF-8, but these guidelines are helpful in
|
|
* choosing a name:
|
|
*
|
|
* http://stackoverflow.com/questions/149932/naming-conventions-for-threads
|
|
*
|
|
* 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().
|
|
*/
|
|
extern DECLSPEC SDL_Thread *SDLCALL
|
|
SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data);
|
|
|
|
#endif
|
|
|
|
/**
|
|
* Get the thread name, as it was specified in SDL_CreateThread().
|
|
* This function returns a pointer to a UTF-8 string that names the
|
|
* specified thread, or NULL if it doesn't have a name. This is internal
|
|
* memory, not to be free()'d by the caller, and remains valid until the
|
|
* specified thread is cleaned up by SDL_WaitThread().
|
|
*/
|
|
extern DECLSPEC const char *SDLCALL SDL_GetThreadName(SDL_Thread *thread);
|
|
|
|
/**
|
|
* Get the thread identifier for the current thread.
|
|
*/
|
|
extern DECLSPEC SDL_threadID SDLCALL SDL_ThreadID(void);
|
|
|
|
/**
|
|
* Get the thread identifier for the specified thread.
|
|
*
|
|
* Equivalent to SDL_ThreadID() if the specified thread is NULL.
|
|
*/
|
|
extern DECLSPEC SDL_threadID SDLCALL SDL_GetThreadID(SDL_Thread * thread);
|
|
|
|
/**
|
|
* Set the priority for the current thread
|
|
*/
|
|
extern DECLSPEC int SDLCALL SDL_SetThreadPriority(SDL_ThreadPriority priority);
|
|
|
|
/**
|
|
* 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);
|
|
* }
|
|
*
|
|
* 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 (*destructor)(void*));
|
|
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* _SDL_thread_h */
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|