mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 10:28:28 -05:00
455 lines
16 KiB
C
Executable File
455 lines
16 KiB
C
Executable File
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2021 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
|
|
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"
|
|
|
|
#if defined(__WIN32__)
|
|
#include <process.h> /* _beginthreadex() and _endthreadex() */
|
|
#endif
|
|
#if defined(__OS2__) /* for _beginthread() and _endthread() */
|
|
#ifndef __EMX__
|
|
#include <process.h>
|
|
#else
|
|
#include <stdlib.h>
|
|
#endif
|
|
#endif
|
|
|
|
#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.
|
|
*
|
|
* SDL will make system changes as necessary in order to apply the thread priority.
|
|
* Code which attempts to control thread state related to priority should be aware
|
|
* that calling SDL_SetThreadPriority may alter such state.
|
|
* SDL_HINT_THREAD_PRIORITY_POLICY can be used to control aspects of this behavior.
|
|
*
|
|
* \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_TIME_CRITICAL
|
|
} SDL_ThreadPriority;
|
|
|
|
/**
|
|
* The function passed to SDL_CreateThread().
|
|
*
|
|
* \param data what was passed as `data` to SDL_CreateThread()
|
|
* \returns a value that can be reported through SDL_WaitThread().
|
|
*/
|
|
typedef int (SDLCALL * SDL_ThreadFunction) (void *data);
|
|
|
|
|
|
#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 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 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:
|
|
* Always use the _beginthread() and _endthread() of the calling runtime
|
|
* library!
|
|
*/
|
|
#define SDL_PASSED_BEGINTHREAD_ENDTHREAD
|
|
|
|
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.
|
|
*/
|
|
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(int (SDLCALL * fn) (void *),
|
|
const char *name, const size_t stacksize, 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)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
|
|
|
|
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 new thread with a default stack size.
|
|
*
|
|
* This is equivalent to calling:
|
|
*
|
|
* ```c
|
|
* SDL_CreateThreadWithStackSize(fn, name, 0, data);
|
|
* ```
|
|
*
|
|
* \param fn the SDL_ThreadFunction function to call in the new thread
|
|
* \param name the name of the thread
|
|
* \param data a pointer that is passed to `fn`
|
|
* \returns an opaque pointer to the new thread object on success, NULL if the
|
|
* new thread could not be created; call SDL_GetError() for more
|
|
* information.
|
|
*
|
|
* \sa SDL_CreateThreadWithStackSize
|
|
* \sa SDL_WaitThread
|
|
*/
|
|
extern DECLSPEC SDL_Thread *SDLCALL
|
|
SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data);
|
|
|
|
/**
|
|
* Create a new thread with a specific stack size.
|
|
*
|
|
* SDL makes an attempt to report `name` to the system, so that debuggers can
|
|
* display it. Not all platforms support this.
|
|
*
|
|
* 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:
|
|
*
|
|
* https://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().
|
|
*
|
|
* 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. You generally need to specify a stack that is a
|
|
* multiple of the system's page size (in many cases, this is 4 kilobytes, but
|
|
* check your system documentation).
|
|
*
|
|
* In SDL 2.1, stack size will be folded into the original SDL_CreateThread
|
|
* function, but for backwards compatibility, this is currently a separate
|
|
* function.
|
|
*
|
|
* \param fn the SDL_ThreadFunction function to call in the new thread
|
|
* \param name the name of the thread
|
|
* \param stacksize the size, in bytes, to allocate for the new thread stack.
|
|
* \param data a pointer that is passed to `fn`
|
|
* \returns an opaque pointer to the new thread object on success, NULL if the
|
|
* new thread could not be created; call SDL_GetError() for more
|
|
* information.
|
|
*
|
|
* \sa SDL_WaitThread
|
|
*/
|
|
extern DECLSPEC SDL_Thread *SDLCALL
|
|
SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn, const char *name, const size_t stacksize, void *data);
|
|
|
|
#endif
|
|
|
|
/**
|
|
* Get the thread name as it was specified in SDL_CreateThread().
|
|
*
|
|
* This is internal memory, not to be freed by the caller, and remains valid
|
|
* until the specified thread is cleaned up by SDL_WaitThread().
|
|
*
|
|
* \param thread the thread to query
|
|
* \returns a pointer to a UTF-8 string that names the specified thread, or
|
|
* NULL if it doesn't have a name.
|
|
*
|
|
* \sa SDL_CreateThread
|
|
*/
|
|
extern DECLSPEC const char *SDLCALL SDL_GetThreadName(SDL_Thread *thread);
|
|
|
|
/**
|
|
* Get the thread identifier for the current thread.
|
|
*
|
|
* This thread identifier is as reported by the underlying operating system.
|
|
* If SDL is running on a platform that does not support threads the return
|
|
* value will always be zero.
|
|
*
|
|
* This function also returns a valid thread ID when called from the main
|
|
* thread.
|
|
*
|
|
* \returns the ID of the current thread.
|
|
*
|
|
* \sa SDL_GetThreadID
|
|
*/
|
|
extern DECLSPEC SDL_threadID SDLCALL SDL_ThreadID(void);
|
|
|
|
/**
|
|
* Get the thread identifier for the specified thread.
|
|
*
|
|
* This thread identifier is as reported by the underlying operating system.
|
|
* If SDL is running on a platform that does not support threads the return
|
|
* value will always be zero.
|
|
*
|
|
* \param thread the thread to query
|
|
* \returns the ID of the specified thread, or the ID of the current thread if
|
|
* `thread` is NULL.
|
|
*
|
|
* \sa SDL_ThreadID
|
|
*/
|
|
extern DECLSPEC SDL_threadID SDLCALL SDL_GetThreadID(SDL_Thread * thread);
|
|
|
|
/**
|
|
* Set the priority for the current thread.
|
|
*
|
|
* Note that some platforms will not let you alter the priority (or at least,
|
|
* promote the thread to a higher priority) at all, and some require you to be
|
|
* an administrator account. Be prepared for this to fail.
|
|
*
|
|
* \param priority the SDL_ThreadPriority to set
|
|
* \returns 0 on success or a negative error code on failure; call
|
|
* SDL_GetError() for more information.
|
|
*/
|
|
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
|
|
* `status`, if `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 a NULL thread to this function; it is a no-op.
|
|
*
|
|
* Note that the thread pointer is freed by this function and is not valid
|
|
* afterward.
|
|
*
|
|
* \param thread the SDL_Thread pointer that was returned from the
|
|
* SDL_CreateThread() call that started this thread
|
|
* \param status pointer to an integer that will receive the value returned
|
|
* from the thread function by its 'return', or NULL to not
|
|
* receive such value back.
|
|
*
|
|
* \sa SDL_CreateThread
|
|
* \sa SDL_DetachThread
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread * thread, int *status);
|
|
|
|
/**
|
|
* Let a thread clean up on exit without intervention.
|
|
*
|
|
* 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.
|
|
*
|
|
* \param thread the SDL_Thread pointer that was returned from the
|
|
* SDL_CreateThread() call that started this thread
|
|
*
|
|
* \since This function is available since SDL 2.0.2.
|
|
*
|
|
* \sa SDL_CreateThread
|
|
* \sa SDL_WaitThread
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_DetachThread(SDL_Thread * thread);
|
|
|
|
/**
|
|
* Create a piece of thread-local storage.
|
|
*
|
|
* This creates an identifier that is globally visible to all threads but
|
|
* refers to data that is thread-specific.
|
|
*
|
|
* \returns the newly created thread local storage identifier or 0 on error.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_TLSGet
|
|
* \sa SDL_TLSSet
|
|
*/
|
|
extern DECLSPEC SDL_TLSID SDLCALL SDL_TLSCreate(void);
|
|
|
|
/**
|
|
* Get the current thread's value associated with a thread local storage ID.
|
|
*
|
|
* \param id the thread local storage ID
|
|
* \returns the value associated with the ID for the current thread or NULL if
|
|
* no value has been set; call SDL_GetError() for more information.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_TLSCreate
|
|
* \sa SDL_TLSSet
|
|
*/
|
|
extern DECLSPEC void * SDLCALL SDL_TLSGet(SDL_TLSID id);
|
|
|
|
/**
|
|
* Set the current thread's value associated with a thread local storage ID.
|
|
*
|
|
* The function prototype for `destructor` is:
|
|
*
|
|
* ```c
|
|
* void destructor(void *value)
|
|
* ```
|
|
*
|
|
* where its parameter `value` is what was passed as `value` to SDL_TLSSet().
|
|
*
|
|
* \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
|
|
* \returns 0 on success or a negative error code on failure; call
|
|
* SDL_GetError() for more information.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_TLSCreate
|
|
* \sa SDL_TLSGet
|
|
*/
|
|
extern DECLSPEC int SDLCALL SDL_TLSSet(SDL_TLSID id, const void *value, void (SDLCALL *destructor)(void*));
|
|
|
|
/**
|
|
* Cleanup all TLS data for this thread.
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_TLSCleanup(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: */
|