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From "Geir Magnusson Jr (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HARMONY-1541) [drlvm] [jvmti] JVMTI breakpoint handler should exit exception/signal handler before calling agent callbacks
Date Sat, 23 Sep 2006 13:05:24 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-1541?page=all ]

Geir Magnusson Jr resolved HARMONY-1541.

    Resolution: Fixed


Ubuntu 6 - smoke, c-unit

> [drlvm] [jvmti] JVMTI breakpoint handler should exit exception/signal handler before
calling agent callbacks
> ------------------------------------------------------------------------------------------------------------
>                 Key: HARMONY-1541
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1541
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Gregory Shimansky
>         Assigned To: Geir Magnusson Jr
>         Attachments: Fix-JVMTI-breakpoint-handler.patch
> The current implementation of JVMTI breakpoints invokes agent from inside of exception
(on Windows) or signal (on Linux) handler. This usually works but may cause problems if for
example agent decides to stop the thread with breakpoint for some long time. On Windows exception
handler cannot be invoked by another thread until other exception handler is running. This
may cause dead locks with any exception happening in other threads, e.g. C++ exceptions on
windows are done through the same mechanism. On Linux calling arbitrary functions from inside
of signal handler may not work as well.
> The solution for this problem is if JVMTI sees that happened breakpoint is actually set
by JVMTI, for processing it it should exit the handler. In order to start breakpoint processing
the handler exit IP is changed from the IP pointing to the interrupted location to the JVMTI
processing handler. Then exception/signal handler exits and makes the kernel happy while execution
is transferred to JVMTI breakpoints handler. This also is done while holding breakpoints list
lock so that no intermittent modification, like removing the breakpoin which caused exception
is possible.

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