Fastest way to get the TID (Thread Information Block) in a 64-bit Windows application?

Question

I have a very compute-intensive module in which I\'ve added stack-tracing to be able to find specific problems. Although the application is allowed to run slower when this

Answer 1

Found it, the following code does the trick:

#include <windows.h>
#include <winnt.h>

struct _TEB
   {
   NT_TIB NtTib;
   // Ignore rest of struct
   };

void *startOfStack;
startOfStack = NtCurrentTeb()->NtTib.StackBase;
std::cout << "startOfStack = " << startOfStack << std::endl;

I looked to the definition of NtCurrentTeb() in winnt.h and it looks like this is a very low level function, so it will probably be fast enough to get what I want.

Answer 2

it should be __readgsqword instead of __readfsqword on 64-bit.