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quit_comp_thread and quit_decomp_thread are accessed by several thread, it's better to protect them with locks. We use a per thread flag to replace the global one, and the new flag is protected by a lock. Signed-off-by: Liang Li <liang.z.li@intel.com> Message-Id: <1462433579-13691-7-git-send-email-liang.z.li@intel.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>