use a pthread_rwlock_t for open chunked file bookkeeping
use a pthread_rwlock_t for open chunked file bookkeeping

trshaffer/cvmfs,cvmfs-testing/cvmfs,cvmfs-testing/cvmfs,trshaffer/cvmfs,djw8605/cvmfs,btovar/cvmfs,Moliholy/cvmfs,reneme/cvmfs,cvmfs-testing/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,MicBrain/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs-testing/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,bbockelm/cvmfs,reneme/cvmfs,reneme/cvmfs,bbockelm/cvmfs,Moliholy/cvmfs,reneme/cvmfs,MicBrain/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,MicBrain/cvmfs,ruvolof/cvmfs,bbockelm/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,btovar/cvmfs,Gangbiao/cvmfs,cvmfs-testing/cvmfs,ruvolof/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,btovar/cvmfs,trshaffer/cvmfs,MicBrain/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,bbockelm/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,ruvolof/cvmfs,btovar/cvmfs,Gangbiao/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,MicBrain/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,ruvolof/cvmfs,btovar/cvmfs,DrDaveD/cvmfs,bbockelm/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,cvmfs/cvmfs,trshaffer/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,djw8605/cvmfs,ruvolof/cvmfs