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Fix Keyhotee hang when setting system clock back bug

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This commit is contained in:
Eric Frias 2014-04-01 14:47:49 -04:00
parent 99fb836492
commit f791cba36b
1 changed files with 18 additions and 2 deletions
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20
src/thread/thread_d.hpp
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@ -388,8 +388,24 @@ namespace fc {
if( timeout_time == time_point::maximum() ) {
task_ready.wait( lock );
} else if( timeout_time != time_point::min() ) {
task_ready.wait_until( lock, boost::chrono::system_clock::time_point() +
boost::chrono::microseconds(timeout_time.time_since_epoch().count()) );
/* This bit is kind of sloppy -- this wait was originally implemented as a wait
* with respect to boost::chrono::system_clock. This behaved rather comically
* if you were to do a:
* fc::usleep(fc::seconds(60));
* and then set your system's clock back a month, it would sleep for a month
* plus a minute before waking back up (this happened on Linux, it seems
* Windows' behavior in this case was less unexpected).
*
* Boost Chrono's steady_clock will always increase monotonically so it will
* avoid this behavior.
*
* Right now we don't really have a way to distinguish when a timeout_time is coming
* from a function that takes a relative time like fc::usleep() vs something
* that takes an absolute time like fc::promise::wait_until(), so we can't always
* do the right thing here.
*/
task_ready.wait_until( lock, boost::chrono::steady_clock::now() +
boost::chrono::microseconds(timeout_time.time_since_epoch().count() - time_point::now().time_since_epoch().count()) );
}
}
}