8377935: (process) jspawnhelper race can cause hangs in ProcessBuilder - fix for FORK mode#29725

tstuefe wants to merge 2 commits intoopenjdk:masteropenjdk/jdk:masterfrom

tstuefe:JDK-8377935-process-jspawnhelper-race-can-cause-hangs-in-ProcessBuilder-fix-for-FORK-modetstuefe/jdk:JDK-8377935-process-jspawnhelper-race-can-cause-hangs-in-ProcessBuilder-fix-for-FORK-modeCopy head branch name to clipboard