WinRT: merged with SDL 2.0.0 codebase (aka. SDL hg rev d4ce48ff30d1)

src/thread/stdcpp/SDL_systhread.cpp

@@ -0,0 +1,124 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2012 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_config.h"
+
+/* Thread management routines for SDL */
+
+extern "C" {
+#include "SDL_thread.h"
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+#include "SDL_log.h"
+}
+
+#include <mutex>
+#include <thread>
+
+// HACK: Mimic C++11's thread_local keyword on Visual C++ 2012 (aka. VC++ 11)
+// TODO: make sure this hack doesn't get used if and when Visual C++ supports
+// the official, 'thread_local' keyword.
+#ifdef _MSC_VER
+#define thread_local __declspec(thread)
+// Documentation for __declspec(thread) can be found online at:
+// http://msdn.microsoft.com/en-us/library/2s9wt68x.aspx
+#endif
+
+static void
+RunThread(void *args)
+{
+    SDL_RunThread(args);
+}
+
+extern "C"
+int
+SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
+{
+    try {
+        std::thread cpp_thread(RunThread, args);
+        thread->handle = (void *) new std::thread(std::move(cpp_thread));
+        return 0;
+    } catch (std::exception & ex) {
+        SDL_SetError("unable to create a C++ thread: %s", ex.what());
+        return -1;
+    } catch (...) {
+        SDL_SetError("unable to create a C++ thread due to an unknown exception");
+        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)
+{
+    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;
+}
+
+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.
+    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 (...) {
+        // Catch any exceptions, just in case.
+        // Report nothing, as SDL_WaitThread does not seem to offer a means
+        // to report errors to its callers.
+    }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */