2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
21 #include "../../SDL_internal.h"
23 /* Thread management routines for SDL */
26 #include "SDL_thread.h"
27 #include "../SDL_thread_c.h"
28 #include "../SDL_systhread.h"
34 #include <system_error>
48 SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
51 std::thread cpp_thread(RunThread, args);
52 thread->handle = (void *) new std::thread(std::move(cpp_thread));
54 } catch (std::system_error & ex) {
55 SDL_SetError("unable to start a C++ thread: code=%d; %s", ex.code(), ex.what());
57 } catch (std::bad_alloc &) {
65 SDL_SYS_SetupThread(const char *name)
67 // Make sure a thread ID gets assigned ASAP, for debugging purposes:
77 return GetCurrentThreadId();
79 // HACK: Mimick a thread ID, if one isn't otherwise available.
80 static thread_local SDL_threadID current_thread_id = 0;
81 static SDL_threadID next_thread_id = 1;
82 static std::mutex next_thread_id_mutex;
84 if (current_thread_id == 0) {
85 std::lock_guard<std::mutex> lock(next_thread_id_mutex);
86 current_thread_id = next_thread_id;
90 return current_thread_id;
96 SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
98 // Thread priorities do not look to be settable via C++11's thread
99 // interface, at least as of this writing (Nov 2012). std::thread does
100 // provide access to the OS' native handle, however, and some form of
101 // priority-setting could, in theory, be done through this interface.
103 // WinRT: UPDATE (Aug 20, 2013): thread priorities cannot be changed
104 // on WinRT, at least not for any thread that's already been created.
105 // WinRT threads appear to be based off of the WinRT class,
106 // ThreadPool, more info on which can be found at:
107 // http://msdn.microsoft.com/en-us/library/windows/apps/windows.system.threading.threadpool.aspx
109 // For compatibility sake, 0 will be returned here.
115 SDL_SYS_WaitThread(SDL_Thread * thread)
122 std::thread * cpp_thread = (std::thread *) thread->handle;
123 if (cpp_thread->joinable()) {
126 } catch (std::system_error &) {
127 // An error occurred when joining the thread. SDL_WaitThread does not,
128 // however, seem to provide a means to report errors to its callers
135 SDL_SYS_DetachThread(SDL_Thread * thread)
142 std::thread * cpp_thread = (std::thread *) thread->handle;
143 if (cpp_thread->joinable()) {
144 cpp_thread->detach();
146 } catch (std::system_error &) {
147 // An error occurred when detaching the thread. SDL_DetachThread does not,
148 // however, seem to provide a means to report errors to its callers
157 return SDL_Generic_GetTLSData();
162 SDL_SYS_SetTLSData(SDL_TLSData *data)
164 return SDL_Generic_SetTLSData(data);
167 /* vi: set ts=4 sw=4 expandtab: */