| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2019 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. |
| */ |
| #include "../../SDL_internal.h" |
| |
| /* Thread management routines for SDL */ |
| |
| extern "C" { |
| #include "SDL_thread.h" |
| #include "../SDL_thread_c.h" |
| #include "../SDL_systhread.h" |
| #include "SDL_log.h" |
| } |
| |
| #include <mutex> |
| #include <thread> |
| #include <system_error> |
| |
| #ifdef __WINRT__ |
| #include <Windows.h> |
| #endif |
| |
| static void |
| RunThread(void *args) |
| { |
| SDL_RunThread(args); |
| } |
| |
| extern "C" |
| int |
| SDL_SYS_CreateThread(SDL_Thread * thread, void *args) |
| { |
| try { |
| // !!! FIXME: no way to set a thread stack size here. |
| std::thread cpp_thread(RunThread, args); |
| thread->handle = (void *) new std::thread(std::move(cpp_thread)); |
| return 0; |
| } catch (std::system_error & ex) { |
| SDL_SetError("unable to start a C++ thread: code=%d; %s", ex.code(), ex.what()); |
| return -1; |
| } catch (std::bad_alloc &) { |
| SDL_OutOfMemory(); |
| return -1; |
| } |
| } |
| |
| extern "C" |
| void |
| SDL_SYS_SetupThread(const char *name) |
| { |
| // Make sure a thread ID gets assigned ASAP, for debugging purposes: |
| SDL_ThreadID(); |
| return; |
| } |
| |
| extern "C" |
| SDL_threadID |
| SDL_ThreadID(void) |
| { |
| #ifdef __WINRT__ |
| return GetCurrentThreadId(); |
| #else |
| // HACK: Mimick a thread ID, if one isn't otherwise available. |
| static thread_local SDL_threadID current_thread_id = 0; |
| static SDL_threadID next_thread_id = 1; |
| static std::mutex next_thread_id_mutex; |
| |
| if (current_thread_id == 0) { |
| std::lock_guard<std::mutex> lock(next_thread_id_mutex); |
| current_thread_id = next_thread_id; |
| ++next_thread_id; |
| } |
| |
| return current_thread_id; |
| #endif |
| } |
| |
| extern "C" |
| int |
| SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority) |
| { |
| // Thread priorities do not look to be settable via C++11's thread |
| // interface, at least as of this writing (Nov 2012). std::thread does |
| // provide access to the OS' native handle, however, and some form of |
| // priority-setting could, in theory, be done through this interface. |
| // |
| // WinRT: UPDATE (Aug 20, 2013): thread priorities cannot be changed |
| // on WinRT, at least not for any thread that's already been created. |
| // WinRT threads appear to be based off of the WinRT class, |
| // ThreadPool, more info on which can be found at: |
| // http://msdn.microsoft.com/en-us/library/windows/apps/windows.system.threading.threadpool.aspx |
| // |
| // For compatibility sake, 0 will be returned here. |
| return (0); |
| } |
| |
| extern "C" |
| void |
| SDL_SYS_WaitThread(SDL_Thread * thread) |
| { |
| if ( ! thread) { |
| return; |
| } |
| |
| try { |
| std::thread * cpp_thread = (std::thread *) thread->handle; |
| if (cpp_thread->joinable()) { |
| cpp_thread->join(); |
| } |
| } catch (std::system_error &) { |
| // An error occurred when joining the thread. SDL_WaitThread does not, |
| // however, seem to provide a means to report errors to its callers |
| // though! |
| } |
| } |
| |
| extern "C" |
| void |
| SDL_SYS_DetachThread(SDL_Thread * thread) |
| { |
| if ( ! thread) { |
| return; |
| } |
| |
| try { |
| std::thread * cpp_thread = (std::thread *) thread->handle; |
| if (cpp_thread->joinable()) { |
| cpp_thread->detach(); |
| } |
| } catch (std::system_error &) { |
| // An error occurred when detaching the thread. SDL_DetachThread does not, |
| // however, seem to provide a means to report errors to its callers |
| // though! |
| } |
| } |
| |
| extern "C" |
| SDL_TLSData * |
| SDL_SYS_GetTLSData(void) |
| { |
| return SDL_Generic_GetTLSData(); |
| } |
| |
| extern "C" |
| int |
| SDL_SYS_SetTLSData(SDL_TLSData *data) |
| { |
| return SDL_Generic_SetTLSData(data); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |