[lwip-users] Why does sys_sem_wait_timeout exist?

[Atte Kojo]

While I was investigating the sockets API I really couldn't understand 
the reason why sys_sem_wait_timeout() has been implemented. To me it 
seems that somebody has implemented semaphores with timeouts 
(sys_sem_wait_timeout) on top of semaphores and timeouts (sys_sem_wait 
and sys_timeout), which are implemented on top of semaphores with 
timeouts (sys_arch_sem_wait).

As far as I understand sys_arch_sem_wait is guaranteed to exist, so why 
implement redundant functionality for just one function (lwip_select).