compiler: Make async handshake flag accesses atomic - #3070

compiler: Make async handshake flag accesses atomic#3070

ggorman wants to merge 1 commit into

fix-wait-timingdevitocodes/devito:fix-wait-timingfrom

fix-async-handshake-atomicsdevitocodes/devito:fix-async-handshake-atomicsCopy head branch name to clipboard