cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_systhread.cpp (4468B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
      4
      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.
      8
      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:
     12
     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.
     20*/
     21#include "../../SDL_internal.h"
     22
     23/* Thread management routines for SDL */
     24
     25extern "C" {
     26#include "SDL_thread.h"
     27#include "../SDL_thread_c.h"
     28#include "../SDL_systhread.h"
     29#include "SDL_log.h"
     30}
     31
     32#include <mutex>
     33#include <thread>
     34#include <system_error>
     35
     36#ifdef __WINRT__
     37#include <Windows.h>
     38#endif
     39
     40static void
     41RunThread(void *args)
     42{
     43    SDL_RunThread(args);
     44}
     45
     46extern "C"
     47int
     48SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
     49{
     50    try {
     51        std::thread cpp_thread(RunThread, args);
     52        thread->handle = (void *) new std::thread(std::move(cpp_thread));
     53        return 0;
     54    } catch (std::system_error & ex) {
     55        SDL_SetError("unable to start a C++ thread: code=%d; %s", ex.code(), ex.what());
     56        return -1;
     57    } catch (std::bad_alloc &) {
     58        SDL_OutOfMemory();
     59        return -1;
     60    }
     61}
     62
     63extern "C"
     64void
     65SDL_SYS_SetupThread(const char *name)
     66{
     67    // Make sure a thread ID gets assigned ASAP, for debugging purposes:
     68    SDL_ThreadID();
     69    return;
     70}
     71
     72extern "C"
     73SDL_threadID
     74SDL_ThreadID(void)
     75{
     76#ifdef __WINRT__
     77    return GetCurrentThreadId();
     78#else
     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;
     83
     84    if (current_thread_id == 0) {
     85        std::lock_guard<std::mutex> lock(next_thread_id_mutex);
     86        current_thread_id = next_thread_id;
     87        ++next_thread_id;
     88    }
     89
     90    return current_thread_id;
     91#endif
     92}
     93
     94extern "C"
     95int
     96SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
     97{
     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.
    102    //
    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
    108    //
    109    // For compatibility sake, 0 will be returned here.
    110    return (0);
    111}
    112
    113extern "C"
    114void
    115SDL_SYS_WaitThread(SDL_Thread * thread)
    116{
    117    if ( ! thread) {
    118        return;
    119    }
    120
    121    try {
    122        std::thread * cpp_thread = (std::thread *) thread->handle;
    123        if (cpp_thread->joinable()) {
    124            cpp_thread->join();
    125        }
    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
    129        // though!
    130    }
    131}
    132
    133extern "C"
    134void
    135SDL_SYS_DetachThread(SDL_Thread * thread)
    136{
    137    if ( ! thread) {
    138        return;
    139    }
    140
    141    try {
    142        std::thread * cpp_thread = (std::thread *) thread->handle;
    143        if (cpp_thread->joinable()) {
    144            cpp_thread->detach();
    145        }
    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
    149        // though!
    150    }
    151}
    152
    153extern "C"
    154SDL_TLSData *
    155SDL_SYS_GetTLSData()
    156{
    157    return SDL_Generic_GetTLSData();
    158}
    159
    160extern "C"
    161int
    162SDL_SYS_SetTLSData(SDL_TLSData *data)
    163{
    164    return SDL_Generic_SetTLSData(data);
    165}
    166
    167/* vi: set ts=4 sw=4 expandtab: */