PR/56828 CVS commit: src

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR kern/56828; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/56828 CVS commit: src
Date: Sat, 18 Jan 2025 07:26:06 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sat Jan 18 07:26:06 UTC 2025
 
 Modified Files:
 	src/sys/kern: sys_futex.c
 	src/tests/lib/libc/sys: t_futex_ops.c
 
 Log Message:
 futex(2): Fix FUTEX_CMP_REQUEUE to always compare even if no waiters.
 
 It must always compare the futex value and fail with EAGAIN on
 mismatch, even if there are no waiters.
 
   FUTEX_CMP_REQUEUE (since Linux 2.6.7)
          This operation first checks whether the location uaddr
          still contains the value val3.  If not, the operation
          fails with the error EAGAIN.  Otherwise, the operation [...]
 
 https://man7.org/linux/man-pages/man2/futex.2.html
 
 PR kern/56828: futex calls in Linux emulation sometimes hang
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.20 -r1.21 src/sys/kern/sys_futex.c
 cvs rdiff -u -r1.8 -r1.9 src/tests/lib/libc/sys/t_futex_ops.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.