Re: [Boost-users] [wave] assertion failed - multithread issue?

Subject: Re: [Boost-users] [wave] assertion failed - multithread issue?
From: Sohail Somani (sohail_at_[hidden])
Date: 2009-03-09 18:36:52

Ein Held wrote:
> {
>     std::ifstream instream(file_name);
>     file =
> std::string(std::istreambuf_iterator<char>(instream.rdbuf()),std::istreambuf_iterator<char>());
>     instream.close();
> 
>     for(int i=0;i<10;++i)
>     {
>         boost::thread t(test);
>     }
> 
>     test();
> }

I assume you are using the latest Boost.

At a quick glance, it seems that it is possible for one of your 10
threads to still be running when the main program exits. I wonder if
this is the problem.

You might want to use thread_group and join_all to make sure.

Specifically:

for(...)
{
  // destructor calls detach() -> thread keeps running
  boost::thread t(test);
}

test(); // possible to finish before one of the above threads

Try changing to:

boost::thread_group group;

for(...)
{
  group.add_thread(new boost::thread(test));
}

test();

group.join_all();

Good luck!

-- 
Sohail Somani
http://uint32t.blogspot.com