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| author | Martin Sustrik <sustrik@250bpm.com> | 2010-09-26 13:30:33 +0200 |
|---|---|---|
| committer | Martin Sustrik <sustrik@250bpm.com> | 2010-09-26 13:30:33 +0200 |
| commit | 9129b792486b87d4f54607321427c2df783c9ec1 (patch) | |
| tree | ba8b29e2f44884ebe1a81e724afbe7b6e1f49f83 | |
| parent | e2802d9a4b7e518c549e8dd95a34d2424058f086 (diff) | |
if TSC jumps backwards (in case of migration to a different CPU core) latency peak may occur -- fixed
| -rw-r--r-- | src/app_thread.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/app_thread.cpp b/src/app_thread.cpp index ac59464..fc9bc1f 100644 --- a/src/app_thread.cpp +++ b/src/app_thread.cpp @@ -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; } |