[Boost-users] [Thread] destructor called several times

From: elconio_at_[hidden]
Date: 2006-10-07 11:01:38

Hello,

I am using boost::thread for a program, but it behaved in an unexpected way (to me at least). I extracted a small case that shows my problem.

I searched in the archives and in the docs, but I couldn't figure this out. With the following code [1] I expect the constructor of my the class MyThread to be called only once and yet on my machine it is called 11 times! [2] The problem is that I was freeing some ressources from the destructor and that even before the operator() was called sometimes.

I am using the CVS version from 3 days ago on a linux x86.

Thanks for any help or any pointer !

[1]:
#include <iostream>
#include <boost/thread/thread.hpp>

class MyThread
{
public:
MyThread () { std::cerr << "Constructor called.\n"; }
~MyThread() { std::cerr << "Destructor called " << (++id) << ".\n"; }
void operator()() { std::cerr << "Operator() called.\n"; }

private:
static int id;
};

int MyThread::id = 0;

int main()
{
MyThread * pt = new MyThread();
boost::thread th( *pt );
th.join();
std::cerr << "\nEnd\n";
delete pt;
}

[2]
Constructor called.
Destructor called 1.
Destructor called 2.
Destructor called 3.
Destructor called 4.
Destructor called 5.
Destructor called 6.
Destructor called 7.
Destructor called 8.
Destructor called 9.
Operator() called.
Destructor called 10.

End
Destructor called 11.

-- 
Conio.