1 files changed, 55 insertions, 0 deletions
diff --git a/zencore/thread.cpp b/zencore/thread.cpp
index 20ab19f56..6f27ee528 100644
--- a/zencore/thread.cpp
+++ b/zencore/thread.cpp
@@ -14,6 +14,61 @@
 
 namespace zen {
 
+#if ZEN_PLATFORM_WINDOWS
+// The information on how to set the thread name comes from
+// a MSDN article: http://msdn2.microsoft.com/en-us/library/xcb2z8hs.aspx
+const DWORD kVCThreadNameException = 0x406D1388;
+typedef struct tagTHREADNAME_INFO
+{
+	DWORD  dwType;		// Must be 0x1000.
+	LPCSTR szName;		// Pointer to name (in user addr space).
+	DWORD  dwThreadID;	// Thread ID (-1=caller thread).
+	DWORD  dwFlags;		// Reserved for future use, must be zero.
+} THREADNAME_INFO;
+// The SetThreadDescription API was brought in version 1607 of Windows 10.
+typedef HRESULT(WINAPI* SetThreadDescription)(HANDLE hThread, PCWSTR lpThreadDescription);
+// This function has try handling, so it is separated out of its caller.
+void
+SetNameInternal(DWORD thread_id, const char* name)
+{
+	THREADNAME_INFO info;
+	info.dwType		= 0x1000;
+	info.szName		= name;
+	info.dwThreadID = thread_id;
+	info.dwFlags	= 0;
+	__try
+	{
+		RaiseException(kVCThreadNameException, 0, sizeof(info) / sizeof(DWORD), reinterpret_cast<DWORD_PTR*>(&info));
+	}
+	__except (EXCEPTION_CONTINUE_EXECUTION)
+	{
+	}
+}
+#endif
+
+void
+SetCurrentThreadName([[maybe_unused]] std::string_view ThreadName)
+{
+#if ZEN_PLATFORM_WINDOWS
+	// The SetThreadDescription API works even if no debugger is attached.
+	static auto SetThreadDescriptionFunc =
+		reinterpret_cast<SetThreadDescription>(::GetProcAddress(::GetModuleHandle(L"Kernel32.dll"), "SetThreadDescription"));
+
+	if (SetThreadDescriptionFunc)
+	{
+		SetThreadDescriptionFunc(::GetCurrentThread(), Utf8ToWide(ThreadName).c_str());
+	}
+	// The debugger needs to be around to catch the name in the exception.  If
+	// there isn't a debugger, we are just needlessly throwing an exception.
+	if (!::IsDebuggerPresent())
+		return;
+
+	std::string ThreadNameZ{ThreadName};
+	SetNameInternal(GetCurrentThreadId(), ThreadNameZ.c_str());
+#else
+#endif
+}  // namespace zen
+
 void
 RwLock::AcquireShared()
 {