Feature/signals mapper

[ggreg]

Early pull request for comments 📒 and ongoing modifications 🔧 (cc @oleiade).

[oleiade]

Good to go whenever it passes on travis https://travis-ci.org/botify-labs/process-kit/jobs/21417236 :)

[ggreg]

There is a problem with calling os.waitpid() in the extract_from callback of the process's registry handler, it introduces back a race with the call to os.waitpid() in ProcessOpen.poll().

Consequently if ProcessOpen.poll() calls os.waitpid() first the SIGCHLD handler will not be able to retrieve the handler for the process that exited. It prevents the Process object from resetting its child to None which is the condition to stop waiting in Process.terminate() when wait=True.

[ggreg]

Many unit tests broken. I'm fixing Process.is_alive.

[ggreg]

Oh no! Last commit broke the build 💣!

[oleiade]

[oleiade]

PR is still broken according says travis, what about it?