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Re: A question about target_wait TARGET_WNOHANG and linux_nat_wait_1
On Wed, Oct 7, 2009 at 00:36, Pedro Alves <pedro@codesourcery.com> wrote:
> On Tuesday 06 October 2009 17:27:22, Hui Zhu wrote:
>> Thanks Pedro, I am clear with it now.
>>
>> I have another question about it.
>>
>> > ? ? ? if (pid == -1)
>> > ? ? ? ? {
>>
>> ...
>> ? ? ? ? ?/* And every time we have checked both:
>> ? ? ? ? ? ? In async mode, return to event loop;
>> ? ? ? ? ? ? In sync mode, suspend waiting for a SIGCHLD signal. ?*/
>> ? ? ? ? ?if (options & __WCLONE)
>> ? ? ? ? ? ?{
>>
>> It just handle the "minus_one_ptid".
>>
>> How did it handle the inferior_ptid?
>
> Sorry, I don't think I understand the question, and what made
> you think of inferior_ptid. ?Could you elaborate? ?The function
> returns "minus_one_ptid" when it has nothing better to return.
> infrun.c takes care of switching inferior_ptid when
> needed --- see the context_switch and switch_to_thread
> calls etc..
>
Sorry I didn't say it very clear.
My question is, if the pid != -1, looks like it didn't handle it. If
pid != -1, the function will be hanged in there even if options have
TARGET_WNOHANG.
Thanks,
Hui