Re: [Boost-bugs] [Boost C++ Libraries] #5034: boost::this_thread::sleep either returns instantaneously or spins

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5034: boost::this_thread::sleep either returns instantaneously or spins
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-06-24 01:50:34

#5034: boost::this_thread::sleep either returns instantaneously or spins
-------------------------------+--------------------------------------------
  Reporter:  Jamie Allsop      |       Owner:  anthonyw   
      Type:  Bugs              |      Status:  closed     
 Milestone:  To Be Determined  |   Component:  thread     
   Version:  Boost 1.45.0      |    Severity:  Showstopper
Resolution:  worksforme        |    Keywords:             
-------------------------------+--------------------------------------------

Comment (by storm@…):

 I see the same exact problem on ubuntu 32bit, on virtualbox (mac host),
 but it happens ONLY when I run the program in gdb.

 Spawning 4 thread, each one cycling and sleeping for up to one second
 between any cycle, I always get 1 or 2 threads that never exit from the
 sleep.

 Part of code:

 {{{
         ...
         cout << "Updater started with id " << boost::this_thread::get_id()
 << endl;

         while (true) {

                 /* do things */
                 // Throttle
                 elapsed =
 boost::posix_time::microsec_clock::universal_time() - this->last_update;
                 sleep_for = interval - elapsed;
                 cout << boost::this_thread::get_id() << " sleeping for "
 << sleep_for << endl;
                 boost::this_thread::sleep(sleep_for);
                 cout << boost::this_thread::get_id() << " sleeped for " <<
 sleep_for << endl;
         }
         ...
 }}}


 I get on console:

 {{{
 Updater started with id 0x8090198
 Updater started with id 0x8090810
 0x8090198 sleeping for 0x8090810 sleeping for 00:00:00.998689
 00:00:00.997377
 Updater started with id 0x8090fb0
 0x8090fb0 sleeping for 00:00:00.998187
 Updater started with id 0x8091378
 0x8091378 sleeping for 00:00:00.998543
 0x8090198 sleeped for 00:00:00.997377
 0x8090198 sleeping for 00:00:00.999980
 0x8090810 sleeped for 00:00:00.998689
 0x8090810 sleeping for 00:00:00.999979
 0x8091378 sleeped for 00:00:00.998543
 0x8091378 sleeping for 00:00:00.999979
 0x8090198 sleeped for 00:00:00.999980
 0x8090198 sleeping for 00:00:00.999948
 0x8090810 sleeped for 00:00:00.999979
 0x8090810 sleeping for 00:00:00.999951
 0x8091378 sleeped for 00:00:00.999979
 0x8091378 sleeping for 00:00:00.999958
 }}}

 ( 0x8090fb0 is blocked )

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5034#comment:7>
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