Using Signals between Threads and DLL

[lorenzwo]

Hi, I have to write a c-DLL which works with a special Com Port. in this DLL I Create a new Thread. This Thread Watch the Port with Events. Then I get an Event ( Data on Port).

In which way i can signal from this thread into DLL or Appl. that Data arrives my Port?? It have to work asynchron.
but signal doesn't work.
Please help me
Thanks

[weaknessforcats]

Which OS?? With Windows you use SetEvent() and WaitForSingleOb ject().