Re: [Boost-users] boost::thread::join causes assertion (pthreads)

23 Mar 2005

      Peter Dimov wrote:
...
Vladimir Prus wrote:
...
Peter Dimov wrote:
...
None (if you are sure that this is what assert does, of course -
this is platform specific), except that the asserts should not fire.
So spending time and effort to make something happen when the
asserts fire is not productive.
I disagree. Here, two people report that they got assertion failures.
Good, but we have no idea why. If there were additional diagnostic,
we'd knew the exact system error which was reported.
Hm.
Thorsten Froehlich reports that on Mac OS X pthread_join on a thread 
that has completed returns EINVAL. He is given a lecture on 
pthread_join. Nobody with Mac OS X access bothers to investigate, at 
least not visibly.
<snip>
Well, if anyone would care to compile and run the following program on 
Mac OS X using pthreads, we can at least tell whether there is a 
consistent failure:

// BEGIN
#include 
#include 
#include 
#include <iostream>
#include <ostream>

void my_sleep(int sec)
{
     boost::xtime stop;
     boost::xtime_get(&stop, boost::TIME_UTC);
     stop.sec += sec;
     boost::thread::sleep(stop);
}

void do_nothing() {}

int main()
{
     boost::thread thread1(do_nothing);
     my_sleep(1);
     std::cout << "Joining exited thread\n";
     thread1.join();

     boost::thread thread2(boost::bind(my_sleep, 5));
     std::cout << "Joining running thread\n";
     thread2.join();
}
// END

It works for me on Windows XP (compiled with VC++ 7.1) and Linux 2.6 
(compiled with g++ 3.3).

Ben.

Re: [Boost-users] boost::thread::join causes assertion (pthreads)

Ben Hutchings