Re: [Boost-users] [boost] [thread] thread handling question

Subject: Re: [Boost-users] [boost] [thread] thread handling question
From: Markus Pieper (onkelhotte_at_[hidden])
Date: 2016-06-09 13:05:36

I implemented the thread pool because we can do some other stuff with the 
threads.

But we use the scoped threads in another area now.

Thanks for the advice!
Markus

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Am 3. Juni 2016 12:47:24 vorm. schrieb "Vicente J. Botet Escriba" 
<vicente.botet_at_[hidden]>:

> Le 02/06/2016 à 10:07, Markus Pieper a écrit :
>> Hi, this may be a very dumb question… My boost version is 1.56.0.
>>
>> In my program I use a database logging technique. To avoid blocking
>> the main thread, I coded this:
>>
>> int main()
>> {
>>   while(bDoCalculations == true)
>> {
>>       // calculate some stuff
>>       m_Logger->doLogging();
>>    }
>> }
>>
>> void CLoggingData::doLogging() {
>>    std::vector<float>* Result;
>>    // fill Result
>> boost::thread (&CLoggingData::doStoreData, this, Result);
>> }
>>
>> void CLoggingData::doStoreData(std::vector<float>* dataVector) {
>>    // pass pointer to database writer instance
>>    delete dataVector;
>> }
>>
>> I do not use join() in the doLogging method because I don’t want the
>> main thread to block if the database is busy and will not respond
>> immediately.
>>
>> But then, after a long run I get a boost::thread_resource_error
>> exception. You may say: Of course, you never join your thread and
>> after a few thousands new threads you blow your stack.
>>
>> Well, but what can I do to get my desired behavior? In the
>> documentation I found this which I think of might help:
>>
>> You can use a thread_joiner to ensure that the thread has been joined
>> at the thread destructor.
>>
>> int main()
>> {
>>   boost::thread t(my_func);
>>    boost::thread_joiner g(t);
>>   // do someting else
>> } // here the thread_joiner destructor will join the thread before it
>> is destroyed.
>>
>> But where is the thread_joiner class implemented? Or do I have to add
>> something inside my doStoreData method to end the thread properly?
> Sorry, the documentation is erroneous. It should be boost::scoped_thread<>.
>
> http://www.boost.org/doc/libs/1_56_0/doc/html/thread/ScopedThreads.html
>
> HTH,
> Vicente
>
>
>
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