[issue1300] vkernel suspends execution when showing ddb prompt

Simon 'corecode' Schubert (via DragonFly issue tracker) sinknull at crater.dragonflybsd.org
Fri Feb 27 07:02:14 PST 2009

New submission from Simon 'corecode' Schubert <corecode at fs.ei.tum.de>:

whenever the MP vkernel breaks to the debugger prompt, it will suspend
execution.  To reach the debugger, you will have to put it to foreground manually.

The reason for this is this line in platform/vkernel/i386/mp.c:

                if (pthread_kill(ap_tids[n], SIGSTOP) != 0)

as specified by POSIX, sending a SIGSTOP signal to any thread of a process will
stop the complete process.

The solutions probably would need some other means of thread communication than
a mere stop signal.

messages: 6257
nosy: corecode
status: unread
title: vkernel suspends execution when showing ddb prompt

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