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https://github.com/Amanieu/asyncplusplus

Async++ concurrency framework for C++11
https://github.com/Amanieu/asyncplusplus

Last synced: about 2 months ago
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Async++ concurrency framework for C++11

Lists

README 

        
Async++

=======



Async++ is a lightweight concurrency framework for C++11. The concept was inspired by the [Microsoft PPL library](http://msdn.microsoft.com/en-us/library/dd492418.aspx) and the [N3428](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3428.pdf) C++ standard proposal.



Example

-------

Here is a short example which shows some features of Async++:



```c++

#include 

#include 



int main()

{

    auto task1 = async::spawn([] {

        std::cout << "Task 1 executes asynchronously" << std::endl;

    });

    auto task2 = async::spawn([]() -> int {

        std::cout << "Task 2 executes in parallel with task 1" << std::endl;

        return 42;

    });

    auto task3 = task2.then([](int value) -> int {

        std::cout << "Task 3 executes after task 2, which returned "

                  << value << std::endl;

        return value * 3;

    });

    auto task4 = async::when_all(task1, task3);

    auto task5 = task4.then([](std::tuple,

                                          async::task> results) {

        std::cout << "Task 5 executes after tasks 1 and 3. Task 3 returned "

                  << std::get<1>(results).get() << std::endl;

    });



    task5.get();

    std::cout << "Task 5 has completed" << std::endl;



    async::parallel_invoke([] {

        std::cout << "This is executed in parallel..." << std::endl;

    }, [] {

        std::cout << "with this" << std::endl;

    });



    async::parallel_for(async::irange(0, 5), [](int x) {

        std::cout << x;

    });

    std::cout << std::endl;



    int r = async::parallel_reduce({1, 2, 3, 4}, 0, [](int x, int y) {

        return x + y;

    });

    std::cout << "The sum of {1, 2, 3, 4} is " << r << std::endl;

}



// Output (order may vary in some places):

// Task 1 executes asynchronously

// Task 2 executes in parallel with task 1

// Task 3 executes after task 2, which returned 42

// Task 5 executes after tasks 1 and 3. Task 3 returned 126

// Task 5 has completed

// This is executed in parallel...

// with this

// 01234

// The sum of {1, 2, 3, 4} is 10

```



Supported Platforms

-------------------



The only requirement to use Async++ is a C++11 compiler and standard library. Unfortunately C++11 is not yet fully implemented on most platforms. Here is the list of OS and compiler combinations which are known to work.



- Linux: Works with GCC 4.7+, Clang 3.2+ and Intel compiler 15+.

- Mac: Works with Apple Clang (using libc++). GCC also works but you must get a recent version (4.7+).

- iOS: Works with Apple Clang (using libc++). Note: because iOS has no thread local support, the library uses a workaround based on pthreads.

- Windows: Works with GCC 4.8+ (with pthread-win32) and Visual Studio 2013+.



Building and Installing

-----------------------

Instructions for compiling Async++ and using it in your code are available on the [Building and Installing](https://github.com/Amanieu/asyncplusplus/wiki/Building-and-Installing) page.



Documentation

------------

The Async++ documentation is split into four parts:

- [Tasks](https://github.com/Amanieu/asyncplusplus/wiki/Tasks): This describes task objects which are the core Async++. Reading this first is strongly recommended.

- [Parallel algorithms](https://github.com/Amanieu/asyncplusplus/wiki/Parallel-algorithms): This describes functions to run work on ranges in parallel.

- [Schedulers](https://github.com/Amanieu/asyncplusplus/wiki/Schedulers): This describes the low-level details of Async++ and how to customize it.

- [API Reference](https://github.com/Amanieu/asyncplusplus/wiki/API-Reference): This gives detailed descriptions of all the classes and functions available in Async++.



Contact

-------

You can contact me by email at [email protected].