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List: gdb
Subject: Re: when can find_thread_pid (inferior_ptid) return NULL?
From: Doug Evans <dje () google ! com>
Date: 2009-03-27 0:53:53
Message-ID: e394668d0903261753u761c03b8g896aa4374911fabe () mail ! gmail ! com
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On Thu, Mar 26, 2009 at 3:35 PM, Pedro Alves <pedro@codesourcery.com> wrote:
> On Thursday 26 March 2009 21:36:42, Doug Evans wrote:
>> Hi. Some places in gdb assert that find_thread_pid (inferior_ptid)
>> is never NULL.
>
>> make_cleanup_restore_current_thread:
>>
>> tp = find_thread_pid (inferior_ptid);
>> if (tp)
>> tp->refcount++;
>
> I think that in this particular case, it will always be true.
>
>>
>> Since delete_thread_1 has this:
>>
>> /* If this is the current thread, or there's code out there that
>> relies on it existing (refcount > 0) we can't delete yet. Mark
>> it as exited, and notify it. */
>> if (tp->refcount > 0
>> || ptid_equal (tp->ptid, inferior_ptid))
>> {
>>
>> I would expect that one can always assert
>> find_thread_pid (inferior_ptid) != NULL.
>>
>> Is that true?
>> Or are there situations where it's not true?
>
> When inferior_ptid is null_ptid. You'll also not
> find the old ptid if running the cleanup after something
> clears the thread list, e.g., after killing or poping the target.
Ya, I found that out shortly after ^c^c. What a surprise. :-)
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