Re: [boost.async] Seeking Endorsement

From: Klemens Morgenstern (klemensdavidmorgenstern_at_[hidden])
Date: 2023-07-25 05:09:58

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_at_[hidden]> wrote:

> 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 <boost_at_[hidden]>:
>
> > On 24/07/2023 15:51, Phil Endecott via Boost wrote:
> >> Klemens Morgenstern wrote:
> >>> I am seeking endorsement for my C++20 async coroutine library
> >>> boost.async.
> >>
> >>>  - 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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