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* infrun.c (resume): Extend comment on ignoring single-step

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requests on vfork parents waiting for a vfork-done.
This commit is contained in:
Pedro Alves 2010-09-06 14:22:07 +00:00
parent 423ec54cd3
commit 48f9886d47
2 changed files with 16 additions and 5 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2010-09-06 Pedro Alves <pedro@codesourcery.com>
* infrun.c (resume): Extend comment on ignoring single-step
requests on vfork parents waiting for a vfork-done.
2010-09-06 Jan Kratochvil <jan.kratochvil@redhat.com> 2010-09-06 Jan Kratochvil <jan.kratochvil@redhat.com>
Pedro Alves <pedro@codesourcery.com> Pedro Alves <pedro@codesourcery.com>

16
gdb/infrun.c
View file

@ -1560,13 +1560,19 @@ resume (int step, enum target_signal sig)
QUIT; QUIT;
/* Don't consider single-stepping when the inferior is
waiting_for_vfork_done, either software or hardware step. In
software step, child process will hit the software single step
breakpoint inserted in parent process. In hardware step, GDB
can resumes inferior, and wait for vfork_done event. */
if (current_inferior ()->waiting_for_vfork_done) if (current_inferior ()->waiting_for_vfork_done)
{ {
/* Don't try to single-step a vfork parent that is waiting for
the child to get out of the shared memory region (by exec'ing
or exiting). This is particularly important on software
single-step archs, as the child process would trip on the
software single step breakpoint inserted for the parent
process. Since the parent will not actually execute any
instruction until the child is out of the shared region (such
are vfork's semantics), it is safe to simply continue it.
Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
the parent, and tell it to `keep_going', which automatically
re-sets it stepping. */
if (debug_infrun) if (debug_infrun)
fprintf_unfiltered (gdb_stdlog, fprintf_unfiltered (gdb_stdlog,
"infrun: resume : clear step\n"); "infrun: resume : clear step\n");