Issue #11145 has been updated by Eric Wong.

File 0001-socket-avoid-redundant-fcntl-on-Linux.patch added

Better patch to support sending, too.  I'm limiting this to Linux-only since
it seems newer FreeBSD has support for MSG_DONTWAIT, but I'm not sure it is
complete.

I'll commit in a few days


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Feature #11145: [PATCH] socket: avoid redundant fcntl with MSG_DONTWAIT
https://bugs.ruby-lang.org/issues/11145#change-52643

* Author: Eric Wong
* Status: Open
* Priority: Normal
* Assignee: Akira Tanaka
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MSG_DONTWAIT is enough to force non-blocking I/O under Linux,
so avoid changing the state of a socket.  This will allow certain
threads to do a non-destructive non-blocking "peek" while others
block (without relying on an extra ppoll syscall).

I suspect any OS with the MSG_DONTWAIT flag implements it correctly.  AFAIK,
MSG_DONTWAIT is only on FreeBSD and Linux, and I've only tested on Linux.

* ext/socket/init.c (rsock_s_recvfrom_nonblock): avoid redundant fcntl


---Files--------------------------------
0001-ext-socket-init.c-rsock_s_recvfrom_nonblock-avoid-re.patch (1.02 KB)
0001-socket-avoid-redundant-fcntl-on-Linux.patch (3.15 KB)


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