[zeromq-dev] Race conditions again

[Lindley French]

Inproc messaging is great in concept, but the need to serialize data seems like it could be a bottleneck. An alternative that preserves objects in C++ is QT signals. Unlike most other sig/slot libraries, QT slots on a QObject can be configured to always run on the same thread no matter which thread emits the signal. This makes it easy to use them for inter thread communication.

Of course, there is also value in using the same API for inter thread and inter host communication. The right tool for the right job, and all that.

> On Jan 7, 2014, at 12:31 AM, Pieter Hintjens <ph at imatix.com> wrote:
> 
> I've never used thread sanitizer. Two things strike me. First, if
> there are *real* race conditions, you can help by tracking these down
> and working with us to fix them. Secondly, if these are false
> positives, there must be some "ignore" file, as we use for valgrind.
> 
> As for race conditions in your own code, if you do not use shared
> mutable state, and only pass data between threads via messages, there
> is no opportunity for race conditions in your own code.
> 
> -Pieter
> 
> 
> 
>> On Tue, Jan 7, 2014 at 2:24 AM, Michi Henning <michi at triodia.com> wrote:
>> Hi folks,
>> 
>> I've been using zmq (3.2.3) with good success, but I'm getting a lot of noise from
>> clang's thread sanitizer about race conditions.
>> 
>> I've compiled both 3.2.3 and 4.0.3 with clang and thread sanitizer enabled.
>> Running the test suite generates hundreds of reports of race conditions.
>> It appears that many of these are harmless (at least, I haven't seen any crashes).
>> But getting all this noise from thread sanitizer makes it very difficult to use the
>> tool because any race conditions that I introduce in my own code are very hard
>> to spot in all the noise. (Thread sanitizer does have a suppression mechanism,
>> but it's quite coarse, nowhere near as fine-grained as, say, valgrind's.)
>> 
>> In my experience, problems reported by thread sanitizer are generally worth
>> paying attention to. (There are few false positives.)
>> 
>> Is there any chance of getting a zmq release that runs clean with thread sanitizer?
>> 
>> Thanks,
>> 
>> Michi.
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