Re: [naviserver-devel] ns_proxy crash

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

No hurry, i am doing this the old-fashioned way using ns_thread for now 
but ns_job-like way of handling proxies would be nice

Zoran Vasiljevic wrote:
> On 13.09.2006, at 21:52, Vlad Seryakov wrote:
> 
>> ok, for example i schedule encoder
>>
>> ns_proxy configure channel1 -minslaves 0 -maxslaves 1
>> set h [ns_proxy get channel1]
>> ns_proxy send $h "/usr/bin/mencoder ...."
>>
>> now proxy is running and pool channel1 is taken, in another thread i
>> cannot just issue ns_proxy get channel1, it will hang.
>>
>> I can run ns_proxy active or ns_proxy handles but how i would know  
>> about
>> this particular process in order to use ns_kill?
> 
> I believe that ns_proxy as-implemtented now is not entirely
> correctly, hence it opens whole lotta questions
> as yours above. I'm gonna have to (partly) rewrite it tomorrow.
> But before I do that, the answers:
> 
> Normally a proxy pool is just a collection of proxy-structures.
> Each proxy structure is used to communicate with (and control)
> an process instance. Each thread can acquire a number of such
> structures from the pool. After doing so, it has sole ownership
> of the proxy(es) and other threads have no access to them.
> When a thread is done with the proxy, it can return it to pool
> in which case some other threads can acquire it.
> So, the proxy structure cannot be shared among threads. There
> is no locking that would support that.
> 
> Now we may think about adding this, but to be honest I haven't
> thougth about that at all yet. My first goal is to have a properly
> working ns_proxy module. After we get this stable (which it still
> is not) we can think about extending it.
> 
> Cheers,
> Zoran
> 
> 
>   
> 
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-- 
Vlad Seryakov
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vl...@cr...
http://www.crystalballinc.com/vlad/