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asio: io_uring: add ASIO_DISABLE_IO_URING_IOWAIT #1754

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asio: io_uring: add ASIO_DISABLE_IO_URING_IOWAIT #1754

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8 changes: 8 additions & 0 deletions include/asio/detail/impl/io_uring_service.ipp
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Original file line number Diff line number Diff line change
Expand Up @@ -538,6 +538,14 @@ void io_uring_service::init_ring()
asio::detail::throw_error(ec, "io_uring_queue_init");
}

#if defined(ASIO_DISABLE_IO_URING_IOWAIT)
# if !defined(IORING_FEAT_NO_IOWAIT)
# error ASIO_DISABLE_IO_URING_IOWAIT requires liburing 2.12 or later
# endif // !defined(IORING_FEAT_NO_IOWAIT)
// Opt out of io_uring's in_iowait task marking.
(void)::io_uring_set_iowait(&ring_, false);
#endif // defined(ASIO_DISABLE_IO_URING_IOWAIT)

#if !defined(ASIO_HAS_IO_URING_AS_DEFAULT)
event_fd_ = ::eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (event_fd_ < 0)
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7 changes: 7 additions & 0 deletions src/doc/platform_macros.qbk
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Expand Up @@ -268,6 +268,13 @@ needs.
]
[]
]
[
[`ASIO_DISABLE_IO_URING_IOWAIT`]
[
Linux: suppress io_uring's `in_iowait` task marking.
]
[]
]
[
[`ASIO_HAS_KQUEUE`]
[
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7 changes: 7 additions & 0 deletions src/doc/using.qbk
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Expand Up @@ -260,6 +260,13 @@ functionality, and behaviour of Asio.
pipe to interrupt blocked epoll/select system calls.
]
]
[
[`ASIO_DISABLE_IO_URING_IOWAIT`]
[
Suppresses io_uring's `in_iowait` task marking on Linux via
`io_uring_set_iowait()`.
]
]
[
[`ASIO_DISABLE_KQUEUE`]
[
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