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# Using threads

Eiffel supports multithreaded programs. The thread library provides ways to handle threads safely inside an Eiffel program. Make sure you add it to your project if you want to use threads.

To create a multithreaded program or library:

- Open the Project Settings dialog.
- In the Advanced section, enable Multithreaded option.
- Click OK.
- You must recompile your project for the changes to take effect.

Caution: Make sure the external and precompiled libraries you use have also been compiled with support for threads.

See Also
Creating libraries