BOOST_TEST(n_alive == 1); fails due to race condition in a regression test tool

[greg.nowakowski@…]

This problem is at least from boost_1_50_0 Using gcc-4.1.2, but it has nothing to do with the bug. Platform Linux.

All libs/thread/test modules that test n_avail are having race condition which make cause regression test to fail here :

  void operator()()
  {
    BOOST_TEST(alive_ == 1);
    BOOST_TEST(n_alive == 1); // race condition error
    op_run = true;
  }

Rationale:

When the G() object is being passed, copy constructor is used to copy the object. Then boost::detail::thread_data<G>::run() is executed and G::operator()() called. If this operator is called before the main thread calls ~G(), n_avail may be 2. It is a very rare case to have the new thread execute operator()() before the main thread, and that is why it is so difficult to catch it.

Blessings, Greg.

[viboes]

Changeset [82455] by viboes

[viboes]

Committed revision [82491].