[Interest] QMap crashing in a thread

[Jason H]

I wouldn't think so. as they should have a very good idea of what this is, and that this exists.

I would think perhaps you are accessing a deleted object?

I've used QMap successfully in similar situations.


________________________________
 From: BOUCARD Olivier <boucard_olivier at yahoo.fr>
To: "interest at qt-project.org" <interest at qt-project.org> 
Sent: Thursday, March 13, 2014 4:21 PM
Subject: Re: [Interest] QMap crashing in a thread
 


Hum they do a static_cast before calling the callback:

void render_POST(const http_request& req, http_response** res)
{
 
 static_cast<CHILD*>(this)->render_POST(req, res);
}

Maybe is the source of the problem.




Le Jeudi 13 mars 2014 22h16, BOUCARD Olivier <boucard_olivier at yahoo.fr> a écrit :
 
Thanks Thiago.
>
>I'm not sure to understand. QMap::contains is const.
>So as QMap is re-entrant, in theory QMap::contains should be "thread-safe".
>And I have no other thread accessing the map at this time.
>I sent request manually with curl.
>
>
>
>
>
>
>Le Jeudi 13 mars 2014 22h07, Thiago Macieira <thiago.macieira at intel.com> a écrit :
> 
>Em qui 13 mar 2014, às 18:52:32, BOUCARD Olivier escreveu:
>>> I have this Server class with a QMap<QString, MyClass*> object member.
>>> This server is a HTTP server class using libhttpserver.
>>> I have also a member function which is called by libhttpserver when it
>>> receives a HTTP request. This function is called in a thread created by
>>>
 libhttpserver automatically. And when I try call a  function on the QMap
>>> inside this function I get a Segmentation Fault:
>>
>>You probably forgot to lock a mutex before accessing that QMap.
>>-- 
>>Thiago Macieira - thiago.macieira (AT) intel.com
>>  Software Architect - Intel Open Source Technology Center
>>
>>
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