Re: [Boost-users] RE: Boost thread problem

From: Cory Nelson (phrosty_at_[hidden])
Date: 2005-04-14 07:03:35

so long as you wrap your vector accesses with mutexes, it should be fine.

On 4/14/05, Sliwa, Przemyslaw (London) <Przemyslaw_Sliwa_at_[hidden]> wrote:
> It seems the usage of the vector cases problems with the multithreaded programs on the multiprocessor machines.
> I have changed it to queue and the bug has been resolved. I cannot reproduce it now.
> 
> Thanks for help,
> 
> Pshemek
> 
> -----Original Message-----
> From: boost-users-bounces_at_[hidden] [mailto:boost-users-bounces_at_[hidden]] On Behalf Of C. Michailidis
> Sent: 14 April 2005 07:26
> To: boost-users_at_[hidden]
> Subject: [Boost-users] RE: Boost thread problem
> 
> > All,
> >
> > I have got a problem with the boost::thread package.
> > My idea was to facilitate the multiprocessor ability of my computer and
> > write a program which creates 10 threads which firstly write to the disk
> > certain amount of information and then they read it back and push back
> > certain objects. I am getting some memory access problems when pushing
> > back the objects to the global vector. Can anyone of you understand why
> > there is a problem? I really do not get it since the mutex is locked and
> > the access to the vector is exclusively guaranteed to the active thread.
> >
> >
> > Can you help?
> 
> I tried your code on my system and it seems to work as expected.  No
> exceptions were thrown, there was a file called 'file.txt' in the pwd, and
> TradeVector.size was 80000 after the run.  Of course I needed to remove the
> include of proprietary code - it was replaced with a dummy/stub class like
> this one:
> 
> class CFXTrade {
> public:
>   CFXTrade() {
>   };
>   CFXTrade( int id, string name, double amt ) {
>     m_TradeID = id;
>     m_Name = name;
>     m_Amount = amt;
>   };
> 
>   int m_TradeID;
>   string m_Name;
>   double m_Amount;
> };
> 
> My system looks like this:
> 
> FreeBSD medea.digitalescorts.net 5.4-PRERELEASE FreeBSD 5.4-PRERELEASE #0: Thu
> Mar 31 02:47:38 EST 2005
> root_at_[hidden]:/usr/obj/usr/src/sys/MEDEA  i386
> 
> and I have boost-1.32.0_2 libraries installed.  I built the program from the
> command-line using the following command:
> 
> "gcc hello.cpp -ggdb -I/usr/local/include  -L/usr/local/lib -lboost_thread
> -lc_r"
> 
> The problem may be platform specific.  Are you linking against a thread-safe
> CRT?  Can you provide details regarding your operating system?  Which version
> of the boost library do you have installed?
> 
> My suspicion is that you may not be using a thread-safe CRT.  Of course the
> boost_thread library may be broken for your specific platform (but I doubt
> it).
> 
> Sincerely,
> Constantino Michailidis
> Balston Research LLC
> 
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-- 
Cory Nelson
http://www.int64.org