Re: [Boost-users] [lockfree] overwriting push?

Subject: Re: [Boost-users] [lockfree] overwriting push?
From: Tim Blechmann (tim_at_[hidden])
Date: 2013-05-17 21:40:21

>> I'm using boost::lockfree::spsc_queue in an audio graph to allow audio
>> input samples written from one thread to be read from another. This
>> currently looks like:
[snip]
>> If there is not enough space in the write call, I sequentially pop off
>> elements until there is enough.  Is there a better way to do this?  It
>> seems like there should be a mechanism for just moving the read head
>> forward (atomically) without reading anything, but then I am not sure I
>> completely understand the implications of that on the lockfree model.  I'm
>> also not 100% sure this is adhering to the lockfree model, so please inform
>> me if/how it isn't if you know.

this approach does not look good to me: the correctness of the algorithm
requires a *single* consumer. however you are consuming from the
producer thread, too ... the algorithm expects that only one thread
modifies the read pointer and only one the write pointer.

cheers,
tim