Inline::CPP v0.44 has been uploaded to CPAN. This version implements flocking on the typemap output file within CPP.pm, and on two temp files used by Makefile.PL. This should eliminate race conditions that could possibly be caused within Inline::CPP, particularly when testing under "HARNESS_OPTIONS=jX", or by smokers that are testing more than one install at the same time. The general use case is unlikely to encounter problems, but you never know, so better safe than sorry.
Rob: I notice there are numerous places in the Inline distribution where we're opening for output but not flocking. I didn't even look at possible issues where we might be opening for input, reading, then opening for output and expecting to not tromp on another process that may have gotten in the middle of the cycle. I think that Inline probably should be implementing flocking on all outputs, and anytime an output follows a read, we should use a flocked semaphore file to maintain the lock across the read/write cycle. I can confirm that even after fixing Inline::CPP, we still have race conditions that must be coming from inside of Inline, that rear their ugly head while executing tests in parallel. The fixes within Inline shouldn't be too difficult, but there are so many places that Inline interacts with files, it will be hard to assure we've gotten all of them. I suppose I could implement a semaphore flock at the beginning of compilation phase for Inline::CPP and release it after compilation phase finishes. That would make Inline::CPP concurrency-safe even if Inline were to remain not concurrency-safe. But that's just sweeping the dust under the carpet. :) -- David Oswald daosw...@gmail.com
