Getting C++ Threads Right

Google Tech Talks
December, 12 2007

ABSTRACT

The advent of multicore processors has generated profound debate on the merits of writing parallel programs with threads and locks. Nonetheless, for many application domains, this remains the standard paradigm for writing parallel programs, and at the moment, there is no apparent universal replacement. And it is the focus of this talk.

Somewhat surprisingly, there are a number of often subtle, but generally fixable, industry-wide problems with current approaches to threads programming. We'll focus on probably the most widely used environments, consisting of C or C++ with a standard threads library. Problems span the spectrum from system libraries through language implementations through supporting hardware. They get in the way both in that they often make it difficult to write 100% reliable multi-threaded software, and in that they confuse even the basics of the programming model, thus making it hard to teach. A surprising number of "experts" do not understand the basic rules. Arguably, these problems really need to be addressed to even allow a meaningful comparison to other parallel programming approaches.

Since solutions to these problems generally require a coordinated industry effort, we helped to persuade the C++ standards committee to address them by pursuing a coherent approach to threads in the next C++ standard. The talk will outline some of the proposed solutions, and give an update on this effort.

Speaker: Hans Boehm
Hans Boehm is a member of the advanced architecture group at HP Labs. He has worked on many aspects of programming language design and implementation, including garbage collection and concurrency, and he was HP's representative to the effort to redesign Java's memory model. He is a past Chair of ACM SIGPLAN, and is an ACM Distinguished Scientist.

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  People & Blogs

[MrNotchJohnson]

"I need your clothes, your boots, and your motorcycle."

[Francois Hamel]

yeah but just like he mentionned, many JVM are broken ;)

[lethalsub]

Which programs did you use as benchmarks?

[lethalsub]

Slagging off programming languages is good karma, I think it should be encouraged, especially if the slagged off language in question is one you actually use... ++C is fucking shite.

I also encourage slagging off other people's code, especially if it is proprietary software.

[nickrohn93]

hah you haven't meant many cs majors have you?

[RedofYellow]

Wow, its so evident most of the people watching this video are not computer scientists, I know this because people are hating on other languages. Real computers scientists don't do this.

[CassandraAbbey]

I think subtitle would be more appreciated. thanks

[zvi303]

He definitely needs the subtitles.

[ShadowSky24]

GAH GET YOUR DAMN QUALITY RIGHT GOOGLE, this is so annoying.

Great video = Bad quality... so common these days, I hope this doesn't happen in 2020 (In the future)

[LuckyLuke364]

This would be great if youtube would actually stream it without pausing every 20 seconds (I'm on a 18MBit connection)

[Oscillor]

this could have been interesting if youtube didn't exit fullscreen on pause