Just::Thread Pro v2.4 released

Friday, 10 February 2017

I am pleased to announce that Just::Thread Pro v2.4 has been released.

Just::Thread Pro is our C++ concurrency extensions library which provides an Actor framework for easier concurrency, along with concurrent data structures: a thread-safe queue, and concurrent hash map, and a wrapper for ensuring synchronized access to single objects.

It also includes the new facilities from the Concurrency TS:

• Latches
• Barriers
• atomic_shared_ptr and atomic_weak_ptr
• future::then()
• when_any()
• when_all()

Unwrapping the future

V2.4 adds automatic future unwrapping, as specified by the Concurrency TS, so a future<T> can be constructed from a future<future<T>>. This also works with continuations, so if your continuation returns a future<T>, the return value from then is still a future<T>, whereas if your continuation returns a T that is not a future, then then returns future<T>.

This is great for continuation-style concurrency, as it allows you to compose continuations easily, and use asynchronous calls within continuations without adding an additional layer of future-wrapping.

std::experimental::future<InitialData> first_task();
std::experimental::future<IntermediateData> second_task(InitialData data);
std::experimental::future<FinalData> third_task(IntermediateData data);

std::experimental::future<FinalData> f=first_task.then([](auto data){
    return second_task(data.get());
}).then([](auto data){
    return third_task(data.get());
});

New compiler/OS support

V2.4 also adds support for gcc 5 on Fedora 22 and 23, and gcc 6 on Fedora 24 and 25.

Just::Thread Pro is now fully supported on the following compiler/OS combinations (32-bit and 64-bit):

• Microsoft Visual Studio 2015 for Windows
• gcc 5 for Ubuntu 14.04 or later
• gcc 6 for Ubuntu 14.04 or later
• gcc 5 on Fedora 22 and 23
• gcc 6 on Fedora 24 and 25

Just::Thread Pro v2.2 is also supported with the Just::Thread compatibility library on the following compiler/OS combinations:

• Microsoft Visual Studio 2005, 2008, 2010, 2012 and 2013 for Windows
• TDM gcc 4.5.2, 4.6.1 and 4.8.1 for Windows
• g++ 4.3 or later for Ubuntu 9.04 or later
• g++ 4.4 or later for Fedora 13 or later
• g++ 4.4 for Centos 6
• MacPorts g++ 4.3 to 4.8 on MacOSX Snow Leopard or later

All licences include a free upgrade to point releases, so if you purchase now you'll get a free upgrade to all 2.x releases of Just::Thread Pro.

Posted by Anthony Williams
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Tags: just::thread, release, concurrency, multithreading
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