Implement set_current_thread_name on Windows.

util/thread_name.cpp

@@ -24,6 +24,10 @@
 
 #ifdef __linux__
 #include <pthread.h>
+#else
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <string>
 #endif
 
 namespace Util
@@ -33,8 +37,21 @@ void set_current_thread_name(const char *name)
 #ifdef __linux__
 	pthread_setname_np(pthread_self(), name);
 #else
-	// TODO: Kinda messy.
-	(void)name;
+	using PFN_SetThreadDescription = HRESULT (WINAPI *)(HANDLE, PCWSTR);
+	auto module = GetModuleHandleA("kernel32.dll");
+	PFN_SetThreadDescription SetThreadDescription = module ? reinterpret_cast<PFN_SetThreadDescription>(
+	    (void *)GetProcAddress(module, "SetThreadDescription")) : nullptr;
+
+	if (SetThreadDescription)
+	{
+		std::wstring wname;
+		while (*name != '\0')
+		{
+			wname.push_back(*name);
+			name++;
+		}
+		SetThreadDescription(GetCurrentThread(), wname.c_str());
+	}
 #endif
 }
 }