Commit 24c70804e87523df99f4740ed2829976ec1a9c1b

Russell Belfer 2013-04-12T12:59:38

Add mutex around mapping and unmapping pack files When I was writing threading tests for the new cache, the main error I kept running into was a pack file having it's content unmapped underneath the running thread. This adds a lock around the routines that map and unmap the pack data so that threads can effectively reload the data when they need it. This also required reworking the error handling paths in a couple places in the code which I tried to make consistent.