Under extreme loads of the caching proxy (1000+ connections) occasionally crashes in XrdFileCache::IO::SetInput() as shown here:
https://gist.github.com/osschar/0ae4ca8d1e1cb1b89cd7f7dd9c1094d9#file-gistfile1-txt-L4441

Matevz and I think invalid read/writes in the SyncResponseHandler are due to spurious wakeups in the response handler. We have added protection against this by replacing semaphore with condition variable and do proper locking:
alja@2e44603

With this change we repeated the helgrind test. The SyncResponseHandler errors were not reported anymore.

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