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From: Sebastian Huber <>
Subject: [newlib-cygwin] Load balance sockets with new SO_REUSEPORT_LB option
Date: Fri, 24 Aug 2018 13:11:00 -0000	[thread overview]
Message-ID: <> (raw);h=5c636abe894466a82146994df467e6a7e8c16942

commit 5c636abe894466a82146994df467e6a7e8c16942
Author: sbruno <>
Date:   Mon Apr 23 19:51:00 2018 +0000

    Load balance sockets with new SO_REUSEPORT_LB option
    This patch adds a new socket option, SO_REUSEPORT_LB, which allow multiple
    programs or threads to bind to the same port and incoming connections will be
    load balanced using a hash function.
    Most of the code was copied from a similar patch for DragonflyBSD.
    However, in DragonflyBSD, load balancing is a global on/off setting and can not
    be set per socket. This patch allows for simultaneous use of both the current
    SO_REUSEPORT and the new SO_REUSEPORT_LB options on the same system.
    Required changes to structures
    Globally change so_options from 16 to 32 bit value to allow for more options.
    Add hashtable in pcbinfo to hold all SO_REUSEPORT_LB sockets.
    As DragonflyBSD, a load balance group is limited to 256 pcbs
    (256 programs or threads sharing the same socket).
    Submitted by:	Johannes Lundberg <>
    Sponsored by:	Limelight Networks
    Differential Revision:

 newlib/libc/sys/rtems/include/sys/socket.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/newlib/libc/sys/rtems/include/sys/socket.h b/newlib/libc/sys/rtems/include/sys/socket.h
index 345eaa8..19062c5 100644
--- a/newlib/libc/sys/rtems/include/sys/socket.h
+++ b/newlib/libc/sys/rtems/include/sys/socket.h
@@ -147,6 +147,9 @@ typedef	__uintptr_t	uintptr_t;
 #define	SO_NO_OFFLOAD	0x4000		/* socket cannot be offloaded */
 #define	SO_NO_DDP	0x8000		/* disable direct data placement */
+// XXX: so_options was only 16 bit, now globally increased to 32 bit
+#define	SO_REUSEPORT_LB	0x00010000 /* reuse with load balancing */
  * Additional options, not kept in so_options.

             reply	other threads:[~2018-08-24 13:11 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-24 13:11 Sebastian Huber [this message]
2018-08-24 13:11 Sebastian Huber

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