Re: [boost] [boost.async] Seeking Endorsement

AFAIK, boost::asio::spawn() already uses boost.context internally (stackful coroutines). So I was curious how it works with co_await as you mentioned in your post 25.07.2023 07:10:24 Klemens Morgenstern via Boost :

Do you mean asio::spawn with async? "co_await asio::spawn(co_await async::this_coro::executor, my_stackful_coro, async::use_op)" would do. It can handle any async operation, of which asio::spawn is one.

There is no integration between boost.context and async (and there can't be, I think). I wonder if there could be a faux-routine, that looks like a async-coro, but is actually a boost.context primitive underneath.

Boost.async integrates with everything asio, through the use_op completion token, so you can just use it with boost.process (v2 would be recommended) like this:

That could look akin to this:

promise<void> pipe_reader(asio::readable_pipe & pr) {    std::string buffer;    buffer.resize(4096);    std::size_t n = co_await pr.async_read_some(asio::buffer(buffer), async::use_op);    // do something with the data    pr.close(); }

namespace vs = boost::process::v2; asio::readable_pipe rp{co_await async::this_coro::executor}; v2::process proc(co_await async::this_coro::executor, "/usr/bin/cat", {"source.txt"}, bind_stdio{.stdout=rp}); co_await async::join(pipe_reader(rp), proc.async_wait(async::use_op));

On Tue, Jul 25, 2023 at 12:22 PM oliver.kowalke--- via Boost < boost@lists.boost.org> wrote:

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Because my code relies heavily on asio's spawn() could you provide examples using spawn() in the git repo?

How does boost.async integrate boost.process? I'm especially interested in adync. reading/writing from/to forked process' stdin/stout/stderr.

Oliver

24.07.2023 18:59:47 Niall Douglas via Boost :

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On 24/07/2023 15:51, Phil Endecott via Boost wrote:

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Klemens Morgenstern wrote:

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I am seeking endorsement for my C++20 async coroutine library boost.async.

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- coroutine types (eager, lazy, generators)

Can the generators be used without ASIO? Are they compatible the the C++23 std::generator?

His library works without effort with all third party awaitables. This is a very big thing, previously using C++ coroutines with ASIO meant you had to use ASIO's awaitables and couldn't use any others. With this library, you can mix and match any type of awaitable freely with ASIO code. That's an enormous leap forward in C++ coroutine usability.

I'll be review managing it we currently think between the 8th and 18th of August.

Niall

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