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Re: [lwip-users] Socket API thread safe?

From: pgraf
Subject: Re: [lwip-users] Socket API thread safe?
Date: Tue, 08 Jun 2004 14:00:08 +0200

Wilfred Hoogerbrugge wrote:

> As the subject already shows I wonder if the lwIP socket API is multi
> thread safe.
> I remember having read somewhere it is, but can’t find that statement back.
> As I’m hunting a race condition in my environment using lwIP + socket API,
> I wonder if the problem my lay in the fact I’ve two threads calling the
> socket API (one for sending using sendto and one for receiving using
> recvfrom).
> I already found out that the sys_sem_wait() function sys.c is sometimes
> re-entered (about once a hour), which it doesn’t seem to be designed for
> (?).
> Thanks for reading (and answering).
> BTW: I’m using lwIP 0.7.1

I'm using the sockets API with several threads simultanously under QDOS
(web server, browser, mailclient, TCP echo, etc.) and have little to no
problems since I implemented the "lightweight protection" mechanism for
the lower level.

sys_sem_wait() looks OK for being re-entered by a different thread, since
sys_arch_timeouts() provides the timeouts for the _current_ thread only.

I vaguely remember a similar problem to yours from the early days when my
sys_arch_sem_wait() implementation had a tricky little bug. This looks
like the first place to check.

All the best

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