The NoC primitives are missing cocotb tests. Old code by @wallento is available at imphil/optimsoc@32162b1 and can potentially be used as starting point.

Description

We should introduce support for returning values in thread exit/join exit.

Interface

We are not using the nodes interface, thus we should drop it.

Description

Currently, to signal errors, some functions return a negative error code and others return -1 and set the errno variable to indicate the error.

We should rely on one and only one approach to signal the errors, otherwise caos will follow.

Therefore, we should gradually fix the code to signal errors through the errno variable, since it is the standard for Unix systems.