1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/threademulation/include/ThreadEmulation.h b/third_party/threademulation/include/ThreadEmulation.h
new file mode 100644
index 00000000..874ba5e7
--- /dev/null
+++ b/third_party/threademulation/include/ThreadEmulation.h
@@ -0,0 +1,59 @@
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved.
+//
+//
+// Emulates a subset of the Win32 threading API as a layer on top of WinRT threadpools.
+//
+// Supported features:
+//
+//    - CreateThread (returns a standard Win32 handle which can be waited on, then closed)
+//    - CREATE_SUSPENDED and ResumeThread
+//    - Partial support for SetThreadPriority (see below)
+//    - Sleep
+//    - Thread local storage (TlsAlloc, TlsFree, TlsGetValue, TlsSetValue)
+//
+// Differences from Win32:
+//
+//    - If using TLS other than from this CreateThread emulation, call TlsShutdown before thread/task exit
+//    - No ExitThread or TerminateThread (just return from the thread function to exit)
+//    - No SuspendThread, so ResumeThread is only useful in combination with CREATE_SUSPENDED
+//    - SetThreadPriority is only available while a thread is in CREATE_SUSPENDED state
+//    - SetThreadPriority only supports three priority levels (negative, zero, or positive)
+//    - No thread identifier APIs (GetThreadId, GetCurrentThreadId, OpenThread)
+//    - No affinity APIs
+//    - No GetExitCodeThread
+//    - Failure cases return error codes but do not always call SetLastError
+
+#pragma once
+
+#include <windows.h>
+
+#ifdef __cplusplus
+//namespace ThreadEmulation
+//{
+extern "C" 
+    {
+#endif
+    #ifndef CREATE_SUSPENDED
+    #define CREATE_SUSPENDED 0x00000004
+    #endif
+
+    HANDLE WINAPI CreateThreadRT(_In_opt_ LPSECURITY_ATTRIBUTES unusedThreadAttributes, _In_ SIZE_T unusedStackSize, _In_ LPTHREAD_START_ROUTINE lpStartAddress, _In_opt_ LPVOID lpParameter, _In_ DWORD dwCreationFlags, _Out_opt_ LPDWORD unusedThreadId);
+    DWORD WINAPI ResumeThreadRT(_In_ HANDLE hThread);
+    BOOL WINAPI SetThreadPriorityRT(_In_ HANDLE hThread, _In_ int nPriority);
+    
+    VOID WINAPI SleepRT(_In_ DWORD dwMilliseconds);
+
+    DWORD WINAPI TlsAllocRT();
+    BOOL WINAPI TlsFreeRT(_In_ DWORD dwTlsIndex);
+    LPVOID WINAPI TlsGetValueRT(_In_ DWORD dwTlsIndex);
+    BOOL WINAPI TlsSetValueRT(_In_ DWORD dwTlsIndex, _In_opt_ LPVOID lpTlsValue);
+    
+    void WINAPI TlsShutdown();
+#ifdef __cplusplus
+    }
+#endif