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

From: Sliwa, Przemyslaw (London) (Przemyslaw_Sliwa_at_[hidden])
Date: 2005-04-14 05:22:30

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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