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if TSC jumps backwards (in case of migration to a different CPU core) latency peak may occur -- fixed

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This commit is contained in:
Martin Sustrik 2010-09-26 13:30:33 +02:00
parent e2802d9a4b
commit 9129b79248
1 changed files with 5 additions and 3 deletions
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8
src/app_thread.cpp
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@ -111,9 +111,11 @@ bool zmq::app_thread_t::process_commands (bool block_, bool throttle_)
#error
#endif
// Check whether certain time have elapsed since last command
// processing.
if (current_time - last_processing_time <= max_command_delay)
// Check whether TSC haven't jumped backwards (in case of migration
// between CPU cores) and whether certain time have elapsed since
// last command processing. If it didn't do nothing.
if (current_time >= last_processing_time &&
current_time - last_processing_time <= max_command_delay)
return !terminated;
last_processing_time = current_time;
}