[Boost-users] ASIO Tutorial 5 - Synchronising handlers in a multithreaded programs - Doesn't use both threads for processing

Subject: [Boost-users] ASIO Tutorial 5 - Synchronising handlers in a multithreaded programs - Doesn't use both threads for processing
From: mark (markcsu_at_[hidden])
Date: 2009-05-16 03:54:39

Using the code from 
http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/tutorial/tuttimer5.html 
with a few extra cout's for extra info.

If you print out the thread IDs of at the start of print1 and print2 you'll 
see that both methods are actually using the same thread. ie two threads 
gets created but only one does any work.

I'm printing the thread ID's via
std::cout <<  "print1 " << boost::this_thread::get_id() << std::endl;
std::cout <<  "print2 " << boost::this_thread::get_id() << std::endl;

at the top of print 1 and print 2.

I first noticed this when I was single line stepping through the code trying 
to work out how the second thread could possibly be doing anywork since 
t.join() is called after  io.run(). Also if I comment out io.run() the 
program still works the same as before, except its the second thread doing 
all the processing.

Compiler MSVC 9.0, happens on both debug and release.