From owner-dev-commits-src-main@freebsd.org Wed Jan 6 07:36:12 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 176654C61AE; Wed, 6 Jan 2021 07:36:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4D9h4W4yj5z4qBc; Wed, 6 Jan 2021 07:36:11 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 67D7E1AE97; Wed, 6 Jan 2021 07:36:11 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1067aBHQ077361; Wed, 6 Jan 2021 07:36:11 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1067aBCF077360; Wed, 6 Jan 2021 07:36:11 GMT (envelope-from git) Date: Wed, 6 Jan 2021 07:36:11 GMT Message-Id: <202101060736.1067aBCF077360@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mateusz Guzik Subject: git: 65f775157e0d - main - seqc: add seqc_read_notmodify MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mjg X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 65f775157e0d239f311e912086600f620d0c15cf Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Jan 2021 07:36:12 -0000 The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=65f775157e0d239f311e912086600f620d0c15cf commit 65f775157e0d239f311e912086600f620d0c15cf Author: Mateusz Guzik AuthorDate: 2021-01-06 06:11:15 +0000 Commit: Mateusz Guzik CommitDate: 2021-01-06 07:28:06 +0000 seqc: add seqc_read_notmodify The routine can be used when the caller does not expect to ever have to wait for anything. Checking later with seqc_consistent retains all the guarantees. --- sys/sys/seqc.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sys/sys/seqc.h b/sys/sys/seqc.h index a04e342ad7d3..3cfaaf3acbda 100644 --- a/sys/sys/seqc.h +++ b/sys/sys/seqc.h @@ -81,6 +81,13 @@ seqc_read_any(const seqc_t *seqcp) return (atomic_load_acq_int(__DECONST(seqc_t *, seqcp))); } +static __inline seqc_t +seqc_read_notmodify(const seqc_t *seqcp) +{ + + return (atomic_load_acq_int(__DECONST(seqc_t *, seqcp)) & ~1); +} + static __inline seqc_t seqc_read(const seqc_t *seqcp) {