How to get Semaphore Count?

Check out NtQuerySemaphore. Some extra info can be found here: http://stackoverflow.com/questions/2579536/semaphores-values[^]

Good luck!

If you just want to check if a semaphore wait would block, then just call the wait function with timeout 0:

//! waitForSemaphore sets this event before a potential blocking attempt
//! to aquire the semaphore.
extern HANDLE warnEventHandle;

//! The semaphore.
extern HANDLE mySemaphore;

//! Tries to aquire mySemaphore.
//! @param timeout Milliseconds to wait for semaphore.
//! @return true if semaphore was aquired.
bool waitForSemaphore( DWORD timeout )
{
  // TODO: Check for error return values from WaitForSingleObject.
  if(WAIT_TIMEOUT == WaitForSingleObject(mySemaphore, 0))
  {
    SetEvent(warnEventHandle);
    return (WAIT_OBJECT_O == WaitForSingleObject(mySemaphore, timeout));
  }
  return true;
}

EDIT: Changed the example a bit. The first version would aquire the semaphore twice. Still, this code is only an illustration - the return value from WaitForSingleObject should be checked properly on each call.