[ruby-core:69835] [Ruby trunk - Feature #11139] [PATCH] socket: support accept `sock_nonblock: (true|false)'

Issue #11139 has been updated by Eric Wong.

File socket-support-accept-sock_nonblock-true-false-v2.patch added
Subject changed from [PATCH] socket: accept_nonblock supports "nonblock: false" kwarg to [PATCH] socket: support accept `sock_nonblock: (true|false)'
Description updated

I think we need to preserve existing behavior with accept_nonblock in case
there is code which shares accepted FDs with non-Ruby processes (or even
passes it to a C extension).


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Feature #11139: [PATCH] socket: support accept `sock_nonblock: (true|false)'
https://bugs.ruby-lang.org/issues/11139#change-53233

* Author: Eric Wong
* Status: Feedback
* Priority: Normal
* Assignee: Akira Tanaka
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An application wanting to do non-blocking accept may want to
create a blocking accepted socket, allow it with a kwarg while
preserving default behavior.

This is analogous to the SOCK_NONBLOCK flag in the Linux `accept4'
syscall.

While this has little obvious effect for Ruby API users (which
can emulate blocking behavior) this will reduce syscalls made
internally by Ruby.  Forcing blocking will preserve "wake-one"
behavior in the OS kernel to avoid a "thundering herd" problem.

In all cases, existing Ruby 2.2 behavior is preserved by default
to maximize compatibility, especially when sharing sockets with
non-Ruby processes:

`accept' and `sysaccept' calls will create sockets which are
blocking by default.

`accept_nonblock', calls will create sockets which are non-blocking
by default.


---Files--------------------------------
0002-socket-accept_nonblock-supports-nonblock-false-kwarg.patch (2.94 KB)
socket-support-accept-sock_nonblock-true-false-v2.patch (20.8 KB)


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