[Freeswitch-users] Lua: io.popen/read blocking in other incoming calls

[Anthony Minessale]

if there is any global lock it would be in the lua lib.  I know that would
not happen in C so you may want to step it in the debugger and look for any
evidence of a global mutex in the lua lib.


On Tue, Jan 19, 2010 at 3:03 PM, Dan <freeswitch-users at digitaldan.com>wrote:

> My lua script is calling wget through lua's io.popen to send
> and receive data from a web service. While the f:read to wget  is running,
> other incoming calls will block on the same io.popen call until the first
> call closes the pipe (with f:close()).
>
>  I had assumed every incoming call was on its own thread and that each had
> its own lua instance.  Is there a global lock happening here? Below is the
> runCommand call and the two start and stop methods that are getting called
> in my script when the call begins and ends (notice they even talk to
> different hosts, so its not the web server hanging).  I have put in
> debugging statements and its definitely  hanging  trying to call io.popen
> and not on the f:read.  I noticed on the mod_python page  (
> http://wiki.freeswitch.org/wiki/Mod_python#Known_Bugs) that it had read
> issues that were fixed in 12958, could this be related?  I'm on svn trunk
> version 16272 on 32bit debian etch.
>
> Thanks,
> Dan-
>
> function runCommand(command)
>     local f = io.popen(command) -- runs command
>     local l = f:read("*a") -- read output of command
>     f:close()
>     return l
> end
>
> function notifyStart(id)
>     local url = "http://host1/start?id=" .. id
>
>     local wget = "/usr/bin/wget " .. url
>
>     local out = runCommand(wget)
>
>     return out;
>
> end
>
>
> function notifyStop(id)
>     local url = "http://host2/start?id=" .. id
>
>     local wget = "/usr/bin/wget " .. url
>
>     local out = runCommand(wget)
>
>     return out;
>
> end
>
>
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-- 
Anthony Minessale II

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