APIs of contexts managed by the process manager

The process manager manages a few contexts of its own.

Todo

Continue to write this.

The process manager provides the initial process these RPC calls on its default context:

os.rpc.alarm(seconds)

Ask for an alarm to be sent to you in a given number of seconds. This function is usually called for sleeping a certain time, by calling it then waiting for the answer.

Example usage:

-- Sleep for five seconds and a half.
rpc.alarm(5.5)