[lwip-devel] [bug #25608] Unable to use NO_SYS=1 and SYS_LIGHTWEIGHT_PROT=1

[Simon Goldschmidt]

Follow-up Comment #16, bug #25608 (project lwip):

Bill, last time I checked I could use the defines with NO_SYS=1, not by
implementing the functions but by overriding the defines (sys.h checks if they
are already defined and does not re-define them).

That leaves us with the question why the defines are in sys.h - maybe they
should be moved elswhere.


Jim, I don't see how the stack would work with LIGHTWEIGHT_PROT=0 and
NO_SYS=0: all the pools and some other things would be unprotected, since they
intentionally don't use semaphores (too much overhead for a -- or ++). In my
opinion, LIGHTWEIGHT_PROT is required when using a SYS.

You're right right on NO_SYS=1, however: you only need LIGHTWEIGHT_PROT when
using an ISR-enabled driver, you don't need it in a pure polling environment.

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