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This change is required for unit tests that use spdk_ring mock in multithreaded scenarios. Change-Id: I8f5e83de69a685078cbb01e55daac650f6ae1db1 Signed-off-by: Wojciech Malikowski <wojciech.malikowski@intel.com> Reviewed-on: https://review.gerrithub.io/c/440721 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com>