vincent cui <[email protected]> wrote:
> I had port latest lwip1.4.0 to my system, it works well . but I found some
> additional api about mutex are defined in 1.4.0
>
> I want to know that are they necessary ?
No, as it says in sys.h: "Define LWIP_COMPAT_MUTEX if the port has no mutexes
and binary semaphores should be used instead". The only disadvantage of using
binary semaphores (in this case, the sys_mutex_* functions are defined to their
sys_sem_* substitute) is that you can get priority inversion (mutextes are only
used for communication between API tasks using netconn or sockets and the
tcpip_thread).
Simon
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