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537 lines
21 KiB
C
537 lines
21 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 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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* # CategoryThread
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*
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* SDL thread management routines.
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*/
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#include <SDL3/SDL_stdinc.h>
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#include <SDL3/SDL_error.h>
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#include <SDL3/SDL_properties.h>
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/* Thread synchronization primitives */
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#include <SDL3/SDL_atomic.h>
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#if defined(SDL_PLATFORM_WINDOWS)
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#include <process.h> /* _beginthreadex() and _endthreadex() */
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#endif
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#include <SDL3/SDL_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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/**
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* The SDL thread object.
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*
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* These are opaque data.
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*
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* \since This datatype is available since SDL 3.1.3.
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*
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* \sa SDL_CreateThread
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* \sa SDL_WaitThread
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*/
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typedef struct SDL_Thread SDL_Thread;
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/**
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* A unique numeric ID that identifies a thread.
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*
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* These are different from SDL_Thread objects, which are generally what an
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* application will operate on, but having a way to uniquely identify a thread
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* can be useful at times.
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*
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* \since This datatype is available since SDL 3.1.3.
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*
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* \sa SDL_GetThreadID
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* \sa SDL_GetCurrentThreadID
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*/
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typedef Uint64 SDL_ThreadID;
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/**
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* Thread local storage ID.
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*
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* 0 is the invalid ID. An app can create these and then set data for these
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* IDs that is unique to each thread.
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*
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* \since This datatype is available since SDL 3.1.3.
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*
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* \sa SDL_GetTLS
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* \sa SDL_SetTLS
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*/
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typedef SDL_AtomicInt SDL_TLSID;
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/**
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* The SDL thread priority.
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*
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* SDL will make system changes as necessary in order to apply the thread
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* priority. Code which attempts to control thread state related to priority
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* should be aware that calling SDL_SetCurrentThreadPriority may alter such
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* state. SDL_HINT_THREAD_PRIORITY_POLICY can be used to control aspects of
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* this behavior.
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*
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* \since This enum is available since SDL 3.1.3.
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*/
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typedef enum SDL_ThreadPriority {
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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() as the new thread's entry point.
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*
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* \param data what was passed as `data` to SDL_CreateThread().
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* \returns a value that can be reported through SDL_WaitThread().
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*
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* \since This datatype is available since SDL 3.1.3.
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*/
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typedef int (SDLCALL * SDL_ThreadFunction) (void *data);
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#ifdef SDL_WIKI_DOCUMENTATION_SECTION
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/*
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* Note that these aren't the correct function signatures in this block, but
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* this is what the API reference manual should look like for all intents and
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* purposes.
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*
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* Technical details, not for the wiki (hello, header readers!)...
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*
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* On Windows (and maybe other platforms), a program might use a different
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* C runtime than its libraries. Or, in SDL's case, it might use a C runtime
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* while SDL uses none at all.
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*
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* C runtimes expect to initialize thread-specific details when a new thread
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* is created, but to do this in SDL_CreateThread would require SDL to know
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* intimate details about the caller's C runtime, which is not possible.
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*
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* So SDL_CreateThread has two extra parameters, which are
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* hidden at compile time by macros: the C runtime's `_beginthreadex` and
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* `_endthreadex` entry points. If these are not NULL, they are used to spin
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* and terminate the new thread; otherwise the standard Win32 `CreateThread`
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* function is used. When `SDL_CreateThread` is called from a compiler that
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* needs this C runtime thread init function, macros insert the appropriate
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* function pointers for SDL_CreateThread's caller (which might be a different
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* compiler with a different runtime in different calls to SDL_CreateThread!).
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*
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* SDL_BeginThreadFunction defaults to `_beginthreadex` on Windows (and NULL
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* everywhere else), but apps that have extremely specific special needs can
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* define this to something else and the SDL headers will use it, passing the
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* app-defined value to SDL_CreateThread calls. Redefine this with caution!
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*
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* Platforms that don't need _beginthread stuff (most everything) will fail
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* SDL_CreateThread with an error if these pointers _aren't_ NULL.
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*
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* Unless you are doing something extremely complicated, like perhaps a
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* language binding, **you should never deal with this directly**. Let SDL's
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* macros handle this platform-specific detail transparently!
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*/
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/**
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* Create a new thread with a default stack size.
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*
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* This is a convenience function, equivalent to calling
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* SDL_CreateThreadWithProperties with the following properties set:
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*
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* - `SDL_PROP_THREAD_CREATE_ENTRY_FUNCTION_POINTER`: `fn`
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* - `SDL_PROP_THREAD_CREATE_NAME_STRING`: `name`
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* - `SDL_PROP_THREAD_CREATE_USERDATA_POINTER`: `data`
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*
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* Note that this "function" is actually a macro that calls an internal
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* function with two extra parameters not listed here; they are hidden through
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* preprocessor macros and are needed to support various C runtimes at the
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* point of the function call. Language bindings that aren't using the C
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* headers will need to deal with this.
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*
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* Usually, apps should just call this function the same way on every platform
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* and let the macros hide the details.
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*
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* \param fn the SDL_ThreadFunction function to call in the new thread.
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* \param name the name of the thread.
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* \param data a pointer that is passed to `fn`.
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* \returns an opaque pointer to the new thread object on success, NULL if the
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* new thread could not be created; call SDL_GetError() for more
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* information.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateThreadWithProperties
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* \sa SDL_WaitThread
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*/
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extern SDL_DECLSPEC SDL_Thread * SDLCALL SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data);
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/**
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* Create a new thread with with the specified properties.
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*
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* These are the supported properties:
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*
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* - `SDL_PROP_THREAD_CREATE_ENTRY_FUNCTION_POINTER`: an SDL_ThreadFunction
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* value that will be called at the start of the new thread's life.
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* Required.
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* - `SDL_PROP_THREAD_CREATE_NAME_STRING`: the name of the new thread, which
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* might be available to debuggers. Optional, defaults to NULL.
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* - `SDL_PROP_THREAD_CREATE_USERDATA_POINTER`: an arbitrary app-defined
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* pointer, which is passed to the entry function on the new thread, as its
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* only parameter. Optional, defaults to NULL.
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* - `SDL_PROP_THREAD_CREATE_STACKSIZE_NUMBER`: the size, in bytes, of the new
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* thread's stack. Optional, defaults to 0 (system-defined default).
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*
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* SDL makes an attempt to report `SDL_PROP_THREAD_CREATE_NAME_STRING` to the
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* system, so that debuggers can display it. Not all platforms support this.
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*
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* Thread naming is a little complicated: Most systems have very small limits
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* for the string length (Haiku has 32 bytes, Linux currently has 16, Visual
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* C++ 6.0 has _nine_!), and possibly other arbitrary rules. You'll have to
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* see what happens with your system's debugger. The name should be UTF-8 (but
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* using the naming limits of C identifiers is a better bet). There are no
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* requirements for thread naming conventions, so long as the string is
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* null-terminated UTF-8, but these guidelines are helpful in choosing a name:
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*
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* https://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 it
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* (truncate, etc), but the original string contents will be available from
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* SDL_GetThreadName().
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*
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* The size (in bytes) of the new stack can be specified with
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* `SDL_PROP_THREAD_CREATE_STACKSIZE_NUMBER`. Zero means "use the system
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* default" which might be wildly different between platforms. x86 Linux
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* generally defaults to eight megabytes, an embedded device might be a few
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* kilobytes instead. You generally need to specify a stack that is a multiple
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* of the system's page size (in many cases, this is 4 kilobytes, but check
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* your system documentation).
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*
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* Note that this "function" is actually a macro that calls an internal
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* function with two extra parameters not listed here; they are hidden through
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* preprocessor macros and are needed to support various C runtimes at the
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* point of the function call. Language bindings that aren't using the C
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* headers will need to deal with this.
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*
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* The actual symbol in SDL is `SDL_CreateThreadWithPropertiesRuntime`, so
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* there is no symbol clash, but trying to load an SDL shared library and look
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* for "SDL_CreateThreadWithProperties" will fail.
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*
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* Usually, apps should just call this function the same way on every platform
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* and let the macros hide the details.
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*
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* \param props the properties to use.
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* \returns an opaque pointer to the new thread object on success, NULL if the
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* new thread could not be created; call SDL_GetError() for more
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* information.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateThread
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* \sa SDL_WaitThread
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*/
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extern SDL_DECLSPEC SDL_Thread * SDLCALL SDL_CreateThreadWithProperties(SDL_PropertiesID props);
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#define SDL_PROP_THREAD_CREATE_ENTRY_FUNCTION_POINTER "SDL.thread.create.entry_function"
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#define SDL_PROP_THREAD_CREATE_NAME_STRING "SDL.thread.create.name"
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#define SDL_PROP_THREAD_CREATE_USERDATA_POINTER "SDL.thread.create.userdata"
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#define SDL_PROP_THREAD_CREATE_STACKSIZE_NUMBER "SDL.thread.create.stacksize"
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/* end wiki documentation for macros that are meant to look like functions. */
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#endif
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/* The real implementation, hidden from the wiki, so it can show this as real functions that don't have macro magic. */
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#ifndef SDL_WIKI_DOCUMENTATION_SECTION
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# if defined(SDL_PLATFORM_WINDOWS)
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# ifndef SDL_BeginThreadFunction
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# define SDL_BeginThreadFunction _beginthreadex
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# endif
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# ifndef SDL_EndThreadFunction
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# define SDL_EndThreadFunction _endthreadex
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# endif
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# endif
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#endif
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/* currently no other platforms than Windows use _beginthreadex/_endthreadex things. */
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#ifndef SDL_WIKI_DOCUMENTATION_SECTION
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# ifndef SDL_BeginThreadFunction
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# define SDL_BeginThreadFunction NULL
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# endif
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#endif
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#ifndef SDL_WIKI_DOCUMENTATION_SECTION
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# ifndef SDL_EndThreadFunction
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# define SDL_EndThreadFunction NULL
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# endif
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#endif
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#ifndef SDL_WIKI_DOCUMENTATION_SECTION
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/* These are the actual functions exported from SDL! Don't use them directly! Use the SDL_CreateThread and SDL_CreateThreadWithProperties macros! */
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/**
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* The actual entry point for SDL_CreateThread.
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*
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* \param fn the SDL_ThreadFunction function to call in the new thread
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* \param name the name of the thread
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* \param data a pointer that is passed to `fn`
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* \param pfnBeginThread the C runtime's _beginthreadex (or whatnot). Can be NULL.
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* \param pfnEndThread the C runtime's _endthreadex (or whatnot). Can be NULL.
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* \returns an opaque pointer to the new thread object on success, NULL if the
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* new thread could not be created; call SDL_GetError() for more
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* information.
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*
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* \since This function is available since SDL 3.1.3.
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*/
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extern SDL_DECLSPEC SDL_Thread * SDLCALL SDL_CreateThreadRuntime(SDL_ThreadFunction fn, const char *name, void *data, SDL_FunctionPointer pfnBeginThread, SDL_FunctionPointer pfnEndThread);
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/**
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* The actual entry point for SDL_CreateThreadWithProperties.
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*
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* \param props the properties to use
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* \param pfnBeginThread the C runtime's _beginthreadex (or whatnot). Can be NULL.
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* \param pfnEndThread the C runtime's _endthreadex (or whatnot). Can be NULL.
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* \returns an opaque pointer to the new thread object on success, NULL if the
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* new thread could not be created; call SDL_GetError() for more
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* information.
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*
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* \since This function is available since SDL 3.1.3.
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*/
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extern SDL_DECLSPEC SDL_Thread * SDLCALL SDL_CreateThreadWithPropertiesRuntime(SDL_PropertiesID props, SDL_FunctionPointer pfnBeginThread, SDL_FunctionPointer pfnEndThread);
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#define SDL_CreateThread(fn, name, data) SDL_CreateThreadRuntime((fn), (name), (data), (SDL_FunctionPointer) (SDL_BeginThreadFunction), (SDL_FunctionPointer) (SDL_EndThreadFunction))
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#define SDL_CreateThreadWithProperties(props) SDL_CreateThreadWithPropertiesRuntime((props), (SDL_FunctionPointer) (SDL_BeginThreadFunction), (SDL_FunctionPointer) (SDL_EndThreadFunction))
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#define SDL_PROP_THREAD_CREATE_ENTRY_FUNCTION_POINTER "SDL.thread.create.entry_function"
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#define SDL_PROP_THREAD_CREATE_NAME_STRING "SDL.thread.create.name"
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#define SDL_PROP_THREAD_CREATE_USERDATA_POINTER "SDL.thread.create.userdata"
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#define SDL_PROP_THREAD_CREATE_STACKSIZE_NUMBER "SDL.thread.create.stacksize"
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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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*
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* \param thread the thread to query.
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* \returns a pointer to a UTF-8 string that names the specified thread, or
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* NULL if it doesn't have a name.
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*
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* \since This function is available since SDL 3.1.3.
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*/
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extern SDL_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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* This thread identifier is as reported by the underlying operating system.
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* If SDL is running on a platform that does not support threads the return
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* value will always be zero.
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*
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* This function also returns a valid thread ID when called from the main
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* thread.
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*
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* \returns the ID of the current thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_GetThreadID
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*/
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extern SDL_DECLSPEC SDL_ThreadID SDLCALL SDL_GetCurrentThreadID(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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* This thread identifier is as reported by the underlying operating system.
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* If SDL is running on a platform that does not support threads the return
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* value will always be zero.
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*
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* \param thread the thread to query.
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* \returns the ID of the specified thread, or the ID of the current thread if
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* `thread` is NULL.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_GetCurrentThreadID
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*/
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extern SDL_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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* Note that some platforms will not let you alter the priority (or at least,
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* promote the thread to a higher priority) at all, and some require you to be
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* an administrator account. Be prepared for this to fail.
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*
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* \param priority the SDL_ThreadPriority to set.
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* \returns true on success or false on failure; call SDL_GetError() for more
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* information.
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*
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* \since This function is available since SDL 3.1.3.
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*/
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extern SDL_DECLSPEC bool SDLCALL SDL_SetCurrentThreadPriority(SDL_ThreadPriority priority);
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/**
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* Wait for a thread to finish.
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*
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* Threads that haven't been detached will remain (as a "zombie") until this
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* function cleans them up. Not doing so 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. As
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* 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 pointed to by
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* `status`, if `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 both, or
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* behavior is undefined.
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*
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* It is safe to pass a NULL thread to this function; it is a no-op.
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*
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* Note that the thread pointer is freed by this function and is not valid
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* afterward.
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*
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* \param thread the SDL_Thread pointer that was returned from the
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* SDL_CreateThread() call that started this thread.
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* \param status pointer to an integer that will receive the value returned
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* from the thread function by its 'return', or NULL to not
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* receive such value back.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateThread
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* \sa SDL_DetachThread
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*/
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extern SDL_DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status);
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/**
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* Let a thread clean up on exit without intervention.
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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 is
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* useful for long-running threads that nothing needs to synchronize with or
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* further manage. When a detached thread is done, it simply 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 the
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* 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. It is
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* 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. Use
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* either that function or this one, but not 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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* \param thread the SDL_Thread pointer that was returned from the
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* SDL_CreateThread() call that started this thread.
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*
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* \since This function is available since SDL 3.1.3.
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*
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* \sa SDL_CreateThread
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* \sa SDL_WaitThread
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*/
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extern SDL_DECLSPEC void SDLCALL SDL_DetachThread(SDL_Thread *thread);
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/**
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* Get the current thread's value associated with a thread local storage ID.
|
|
*
|
|
* \param id a pointer to the thread local storage ID, may not be NULL.
|
|
* \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.
|
|
*
|
|
* \threadsafety It is safe to call this function from any thread.
|
|
*
|
|
* \since This function is available since SDL 3.1.3.
|
|
*
|
|
* \sa SDL_SetTLS
|
|
*/
|
|
extern SDL_DECLSPEC void * SDLCALL SDL_GetTLS(SDL_TLSID *id);
|
|
|
|
/**
|
|
* The callback used to cleanup data passed to SDL_SetTLS.
|
|
*
|
|
* This is called when a thread exits, to allow an app to free any resources.
|
|
*
|
|
* \param value a pointer previously handed to SDL_SetTLS.
|
|
*
|
|
* \since This datatype is available since SDL 3.1.3.
|
|
*
|
|
* \sa SDL_SetTLS
|
|
*/
|
|
typedef void (SDLCALL *SDL_TLSDestructorCallback)(void *value);
|
|
|
|
/**
|
|
* Set the current thread's value associated with a thread local storage ID.
|
|
*
|
|
* If the thread local storage ID is not initialized (the value is 0), a new
|
|
* ID will be created in a thread-safe way, so all calls using a pointer to
|
|
* the same ID will refer to the same local storage.
|
|
*
|
|
* Note that replacing a value from a previous call to this function on the
|
|
* same thread does _not_ call the previous value's destructor!
|
|
*
|
|
* `destructor` can be NULL; it is assumed that `value` does not need to be
|
|
* cleaned up if so.
|
|
*
|
|
* \param id a pointer to the thread local storage ID, may not be NULL.
|
|
* \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, may be NULL.
|
|
* \returns true on success or false on failure; call SDL_GetError() for more
|
|
* information.
|
|
*
|
|
* \threadsafety It is safe to call this function from any thread.
|
|
*
|
|
* \since This function is available since SDL 3.1.3.
|
|
*
|
|
* \sa SDL_GetTLS
|
|
*/
|
|
extern SDL_DECLSPEC bool SDLCALL SDL_SetTLS(SDL_TLSID *id, const void *value, SDL_TLSDestructorCallback destructor);
|
|
|
|
/**
|
|
* Cleanup all TLS data for this thread.
|
|
*
|
|
* If you are creating your threads outside of SDL and then calling SDL
|
|
* functions, you should call this function before your thread exits, to
|
|
* properly clean up SDL memory.
|
|
*
|
|
* \threadsafety It is safe to call this function from any thread.
|
|
*
|
|
* \since This function is available since SDL 3.1.3.
|
|
*/
|
|
extern SDL_DECLSPEC void SDLCALL SDL_CleanupTLS(void);
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include <SDL3/SDL_close_code.h>
|
|
|
|
#endif /* SDL_thread_h_ */
|