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gdb: add assert in remote_target::wait relating to async being off

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While working on another patch I ended up in a situation where I had
async mode disabled (with 'maint set target-async off'), but the async
event token got marked anyway.

In this situation GDB was continually calling into
remote_target::wait, however, the async token would never become
unmarked as the unmarking is guarded by target_is_async_p.

We could just unconditionally unmark the token, but that would feel
like just ignoring a bug, so, instead, lets assert that if
!target_is_async_p, then the async token should not be marked.

This assertion would have caught my earlier mistake.

There should be no user visible changes with this commit.
This commit is contained in:
Andrew Burgess
2021-11-22 12:30:36 +00:00
parent 4f626cad04
commit 8d34471f70
1 changed files with 5 additions and 1 deletions
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6
gdb/remote.c
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@ -8348,9 +8348,13 @@ remote_target::wait (ptid_t ptid, struct target_waitstatus *status,
remote_state *rs = get_remote_state ();
/* Start by clearing the flag that asks for our wait method to be called,
we'll mark it again at the end if needed. */
we'll mark it again at the end if needed. If the target is not in
async mode then the async token should not be marked. */
if (target_is_async_p ())
clear_async_event_handler (rs->remote_async_inferior_event_token);
else
gdb_assert (!async_event_handler_marked
(rs->remote_async_inferior_event_token));
ptid_t event_ptid;