[Boost-bugs] [Boost C++ Libraries] #4533: timespec translation fails for times before 1970

Subject: [Boost-bugs] [Boost C++ Libraries] #4533: timespec translation fails for times before 1970
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-08-12 13:33:52

#4533: timespec translation fails for times before 1970
---------------------------------------------+------------------------------
 Reporter:  Philipp Huber <phu@…>            |       Owner:  anthonyw
     Type:  Bugs                             |      Status:  new     
Milestone:  Boost 1.44.0                     |   Component:  thread  
  Version:  Boost 1.43.0                     |    Severity:  Problem 
 Keywords:  absolute time                    |  
---------------------------------------------+------------------------------
 I had a target system that had always a failed assertion with a call to
 condition_variable::timed_wait();

 I found out, that pthread_cond_timedwait does not accept a timespec
 argument that has negative tv_nsec.

 Therefore I suggest the following patch, which works for me.

 ===================================================================
 --- /boost/boost_1_43_0/boost/thread/pthread/timespec.hpp       (revision
 1769)
 +++ /boost/boost_1_43_0/boost/thread/pthread/timespec.hpp       (working
 copy)
 @@ -26,6 +26,13 @@

              timeout.tv_sec=time_since_epoch.total_seconds();
 timeout.tv_nsec=(long)(time_since_epoch.fractional_seconds()*(1000000000l/time_since_epoch.ticks_per_second()));
 +
 +            if(timeout.tv_nsec < 0L)
 +            {
 +                               timeout.tv_sec -= 1L;
 +                               timeout.tv_nsec += 1000000000L;
 +            }
 +
              return timeout;
          }
      }

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4533>
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