Re: [Sqlrelay-discussion] Dead children (zombies and sem undo)

[David M. <dav...@fi...>]

Actually, it would be a little tricky to code because it would need to 
be a static method accessing members of an instance of scaler, but other 
than that?

On 06/29/2011 01:25 PM, David Muse wrote:
> Renat,
>
> This will definitely improve things, but maybe we should just make the 
> scaler call reapChildren when it receives a SIGCHLD.  Can you think of 
> any reason why we shouldn't do that?
>
> Dave
>
> On 06/29/2011 11:34 AM, Renat Sabitov wrote:
>> Hi David,
>>
>> Did you mention that zombie connections hanging around when scaler 
>> does not receive signal(6) for some time? I made a patch that use 
>> timed wait() on sem(6) and reap dead children every 5 seconds.
>>
>> This patch solve one more issue. Did you know that undo information 
>> on semaphore operations processed after process completely dies, i.e. 
>> after the father executes waitpid(). For this reason it is very 
>> important to reap children in time.
>>
>>
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