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[lwip-devel] [bug #23240] recv_udp increases counters for available rece

From: Jonathan Larmour
Subject: [lwip-devel] [bug #23240] recv_udp increases counters for available receives before netbuf is actually posted
Date: Mon, 02 Jun 2008 11:50:42 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060513 Fedora/1.0.8-1.1.fc3.1.legacy Firefox/1.0.8

Follow-up Comment #4, bug #23240 (project lwip):

Not sure about that. This would have to also cover access to sock->rcvevent.
Although I haven't thought through in detail it seems to me there's a risk of
deadlock (semaphores not being like recursive mutexes).

I think we just need to make these counts be signed quantities (as well as
the proposed fix in comment #0), to avoid problems if they wrap. I'd just like
another opinion on whether that idea has any flaws. Even if a semaphore
wouldn't risk deadlocks, it may be overkill.


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