Re: [Valgrind-developers] Question Related to Helgrind

[Konstantin S. <kon...@gm...>]

2009/3/5 Tayfun Elmas <tay...@gm...>:
> Let me briefly restate the question. The algorithm we are implementing has
> special rules to handle pthread_xxx functions. We would like to be notified
> when a pthread_xxx function is called but would like NOT to be notified
> whatever happens within these functions.

You can disable notifications while in ptread_xxx
Like this:
http://code.google.com/p/data-race-test/source/browse/trunk/tsan/ts_valgrind_intercepts.c#427

>  As a result, we want the sample
> code Pinar sent to trigger our algorithm when pthread_create and
> pthread_join are called but not any other time. I think there is some
> mechanism in Valgrind to do this, but we could not understand it clearly.
> Thanks.
>
> Tayfun
> - Show quoted text -
>
> Konstantin Serebryany wrote:
>>
>> On Tue, Mar 3, 2009 at 3:29 PM, Pınar Tözün <pin...@gm...> wrote:
>>
>>>
>>> Hi,
>>>
>>> I am trying to implement the dynamic race detection algorithm
>>> "Goldilocks" into Helgrind but I am having some difficulties with the
>>> source code. The below c code is from the Valgrind Manual,
>>>
>>> #include <pthread.h>
>>>
>>> int var = 0;
>>>
>>> void* child_fn ( void* arg ) {
>>>  var++; /* Unprotected relative to parent */ /* this is line 6 */
>>>  return NULL;
>>> }
>>>
>>> int main ( void ) {
>>>  pthread_t child;
>>>  pthread_create(&child, NULL, child_fn, NULL);
>>>  var++; /* Unprotected relative to child */ /* this is line 13 */
>>>  pthread_join(child, NULL);
>>>  return 0;
>>> }
>>>
>>> My question is; how can I understand when hg_handle_client_request is
>>> called and entered one of the LOCK cases, that it is not for the
>>> Helgrind's own locking procedures but it is for one of the locks in
>>> the checked c code. Because for the above example c code, although
>>> there is no locking for the variable 'var' it calls a lot of
>>> hg_handle_client_request with one of the LOCK cases in the switch
>>> statement.
>>>
>>
>> Not sure I understood your problem.
>> Do you see LOCK/UNLOCK events when executing the program above?
>> There is probably some locking inside pthread_create...
>>
>> --kcc
>>
>>
>>>
>>> Thank you!
>>> pinar
>>>
>>>
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>>
>>
>
>