c++ identify current thread in function?

Question

Hi!

let's say i have a singleton object with a static function:

static int MySingletonObject::getInt()

now i would like to return a different int depending on which workingthread (MFC threading) is calling the function.

I know that i can pass parameters to the threadingfunction when creating the thread. But Is there a way to identify the thread without info from those parameters?

Thanks!

Answer 1

call GetCurrentThreadId (on a windows machine) it will return the thread id in which context the calling function is running

Answer 2

You can call GetCurrentThreadId() - will return an integer identifier - or GetCurrentThread() - will return a handle which can be cast to an integer identifier - from any thread - those values will be unique for any thread within the process.

Answer 3

What you want is Thread Local Storage. Have a read of this for Windows implementation of TLS: http://msdn.microsoft.com/en-us/library/ms686991%28VS.85%29.aspx

Answer 4

Really sounds like you are looking for thread local storage as Igor suggests - I would choose to use the boost.Thread code (documentation here) because:

• cross platform / compiler

• generally useful and convinient for this kind of task

  (actually I wonder if you are actually trying to create something quite a lot like a boost::thread_specific_ptr given what you said about your needs)