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API usage example
This example shows how to use bus_poll instead of bus_read,
and how to do non-blocking polling and non-blocking writing.
First of, run make to build this example.
To start the example run ./init.
When you are done run ./cleanup.
Running instances of ./poll will check every second
if there is a new inbound message. Between these checks
./write will wait for all ./poll:s to receive the message.
This means that ./write blocks while ./poll sleeps.
If two or more instances of ./write is started at
approximately the same time, only one will continue to
write a message on the bus, the others will fail.
./poll, ./init and ./cleanup are run without any
additional arguments. ./write is run with the message
as the second argument.
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