Re: [naviserver-devel] OpenBSD/sparc64: driver blocks on a new connection if acceptsize > 1

[Vlad S. <vl...@cr...>]

Can it be that if accept is called when there is no incoming request 
something screwed up in the process so subsequent accepts even in other 
threads do not work?

Looks like OpenBSD may not allow to call extra accept

Michael A. Cleverly wrote:
> My adventures (with CVS HEAD) on OpenBSD/sparc64 continue.
> 
> Unless I set:
> 
>     ns_section      "ns/server/${servername}/module/nssock"
>     ns_param       acceptsize          1
> 
> in my conf file then incoming an HTTP request never get serviced
> promptly; I can't connect to the nscp control port, and I can't hit
> CTRL-C to end the (foreground) nsd process.
> 
> If I set ns_param acceptsize to 2 then the first connection "hangs",
> when a second one is made both are processed immediately.
> 
> The default acceptsize is equal to the backlog setting, which defaults
> to 256.  I strongly suspect (but haven't had the patience to confirm)
> that with no acceptsize setting I'd have to have 256 active HTTP
> connections before any would be processed at all.
> 
> I've sprinkled driver.c, binder.c, and sock.c with caveman debugging
> Ns_Log() calls and it appears to block in the while loop attempting to
> accept more when calling the final check of the four checks [in
> DriverThread() in driver.c at line 1272]:
> 
>      (sockPtr = SockAccept(drvPtr)) != NULL
> 
> which seems to end up waiting  [in SockAccept() in driver.c at line 1635-6] on:
> 
>         sockPtr->sock = Ns_SockAccept(drvPtr->sock,
>                                       (struct sockaddr *) &sockPtr->sa, &slen);
> 
> which in turn waits [in Ns_SockAccept() in sock.c at line 420] on:
> 
>     sock = accept(lsock, saPtr, (socklen_t *) lenPtr);
> 
> which makes me think that the listening socket must not be set in
> non-blocking mode(?).
> 
> Suggestions? The same behavior does not occur on OpenBSD 3.8/macppc or
> OpenBSD 3.9/amd64. (Everything works "out-of-the-box" as expected.)
> 
> Michael
> 
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-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/