git: 671e2cb6a237 - stable/15 - _umtx_op.2: document the CVWAIT_UMTX_TIME flag for the UMTX_OP_CV_WAIT_UC request

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=671e2cb6a2376015660441cf5ea97d520621e6ee

commit 671e2cb6a2376015660441cf5ea97d520621e6ee
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2026-07-26 00:00:30 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2026-08-03 00:23:15 +0000

    _umtx_op.2: document the CVWAIT_UMTX_TIME flag for the UMTX_OP_CV_WAIT_UC request
    
    (cherry picked from commit f4a05f37936e422b1e8f4f127253562d3f58f50c)
---
 lib/libsys/_umtx_op.2 | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/lib/libsys/_umtx_op.2 b/lib/libsys/_umtx_op.2
index c590f8e8e0c8..8bdb20fa2178 100644
--- a/lib/libsys/_umtx_op.2
+++ b/lib/libsys/_umtx_op.2
@@ -752,15 +752,21 @@ After wakeup, the
 umutex is not relocked.
 .Pp
 The following flags are defined:
-.Bl -tag -width "CVWAIT_CLOCKID"
+.Bl -tag -width "CVWAIT_UMTX_TIME"
 .It Dv CVWAIT_ABSTIME
 Timeout is absolute.
 .It Dv CVWAIT_CLOCKID
 Clockid is provided.
+.It Dv CVWAIT_UMTX_TIME
+Timeout is specified by
+.Vt struct umtx_time
 .El
 .Pp
 Optionally, a timeout for the request may be specified.
-Unlike other requests, the timeout value is specified directly by a
+If the
+.Dv CVWAIT_UMTX_TIME
+flag is not passed, then, unlike other requests,
+the timeout value is specified directly by a
 .Vt struct timespec ,
 pointed to by the
 .Fa uaddr2
@@ -783,6 +789,19 @@ If the
 flag is supplied, the timeout specifies absolute time value, otherwise
 it denotes a relative time interval.
 .Pp
+Alternatively, if the
+.Dv CVWAIT_UMTX_TIME
+flag is passed, then the
+.Dv CVWAIT_CLOCKID
+and
+.Dv CVWAIT_ABSTIME
+flags must be not passed.
+In this case, the
+.Fa uaddr2
+points to the
+.Va struct umtx_time
+structure which specifes the timeout and clock identifier.
+.Pp
 The request is not restartable.
 An unblocked signal delivered during
 the wait always results in sleep interruption and