Date: Fri, 1 Oct 2021 02:31:43 GMT From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 4b5554cebb66 - main - kqueue: document how timers with low/past timeouts are handled Message-ID: <202110010231.1912Vhip054521@gitrepo.freebsd.org>
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The branch main has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=4b5554cebb66020f59dc869b835aebbd66e4bb8c commit 4b5554cebb66020f59dc869b835aebbd66e4bb8c Author: Kyle Evans <kevans@FreeBSD.org> AuthorDate: 2021-09-30 18:19:05 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2021-10-01 02:31:28 +0000 kqueue: document how timers with low/past timeouts are handled Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D32237 --- lib/libc/sys/kqueue.2 | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2 index 3ded4ae3d8f7..72b3e544391c 100644 --- a/lib/libc/sys/kqueue.2 +++ b/lib/libc/sys/kqueue.2 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd September 23, 2021 +.Dd September 30, 2021 .Dt KQUEUE 2 .Os .Sh NAME @@ -599,6 +599,12 @@ On return, .Va fflags contains the events which triggered the filter. .Pp +Periodic timers with a specified timeout of 0 will be silently adjusted to +timeout after 1 of the time units specified by the requested precision in +.Va fflags . +If an absolute time is specified that has already passed, then it is treated as +if the current time were specified and the event will fire as soon as possible. +.Pp If an existing timer is re-added, the existing timer will be effectively canceled (throwing away any undelivered record of previous timer expiration) and re-started using the new parameters contained in
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