Re: [Valgrind-users] How can I annotate source code to stop valgrind's DRD tool complain about data race?

[Ivo R. <iv...@iv...>]

2016-06-09 15:24 GMT+02:00 Kirill Frolov <kir...@de...>:

> Hello, All!
>
>     How can I annotate source code (see below) to stop valgrind's DRD
> tool complain about data race?
>
>    I think this source doesn't contain any data race, but DRD thinks
> otherwise.  This is because common synchronization primitives (like
> mutexes) not used in this case.  The code relies on possibility of CPU
> to swap 's' pointer atomically.
>
>
You need to help DRD in such cases because as you said you are not using
common synchronization primitives. The question is also why?
I was not able to discern your intention but it seems to me you are
introducing
a barrier or a producer-consumer queue. There are efficient POSIX
synchronization
primitives for these tasks which DRD supports natively.
Otherwise use DRD client requests [1] to annotate your intent.

Kind regards,
I.

[1] http://valgrind.org/docs/manual/drd-manual.html#drd-manual.clientreqs