Hi all, Please review this change.
JBS: https://bugs.openjdk.java.net/browse/JDK-8205992 webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8205992/webrev.00/ I tried to attach jhsdb to java process in docker container from container host, but it couldn't. jcmd supports PID namespace in JDK-8193710, but jhsdb hasn't yet. SA gets LWP ID via thread stack and funcs in libthread_db.so, but they returns PIDs in container - they are different from host's PID. So I added the code to scan /proc/<PID>/task to get all LWP IDs and they are kept in a Map in LinuxDebuggerLocal. Also SA_ALTROOT is set to /proc/<PID>/root if SA detects debuggee runs in container. It helps SA to parse binaries in container. This change has been pushed to submit repo, and it was failed on OS X (mach5-one-ysuenaga-JDK-8205992-20180628-1015-28963). But I guess it causes JDK-8205906. This change affects to Linux only. Could you review it? Thanks, Yasumasa
