PointCloudLibrary/pcl — pull request #582 by j-oberlaender (2014-03-20 13:43:04+00:00)
Title: PCDGrabberImpl: Add mutex to avoid reentry in trigger()/readAhead() and the resulting race condition.

I was able to crash software that was working on TAR archives by manually triggering a read in quick succession. The mutex fixes the race condition.