Fix a race for CUDA event in CachingHostAllocator#237

Merged

fwyzard merged 1 commit intocms-patatrack:CMSSW_10_4_X_Patatrackfrom

makortel:fixHostAllocator2

Jan 7, 2019

Commits on Dec 20, 2018

Need to keep the lock until CUDA event is recorded
makortel
committed