From owner-svn-src-all@freebsd.org Tue Nov 17 03:26:57 2020 Return-Path: Delivered-To: svn-src-all@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 9E9AB47E4A1; Tue, 17 Nov 2020 03:26:57 +0000 (UTC) (envelope-from kevans@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 4CZrw143R2z3KYk; Tue, 17 Nov 2020 03:26:57 +0000 (UTC) (envelope-from kevans@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 7E3301942F; Tue, 17 Nov 2020 03:26:57 +0000 (UTC) (envelope-from kevans@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 0AH3QvXC000164; Tue, 17 Nov 2020 03:26:57 GMT (envelope-from kevans@FreeBSD.org) Received: (from kevans@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 0AH3QvSf000163; Tue, 17 Nov 2020 03:26:57 GMT (envelope-from kevans@FreeBSD.org) Message-Id: <202011170326.0AH3QvSf000163@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kevans set sender to kevans@FreeBSD.org using -f From: Kyle Evans Date: Tue, 17 Nov 2020 03:26:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r367742 - head/lib/libc/sys X-SVN-Group: head X-SVN-Commit-Author: kevans X-SVN-Commit-Paths: head/lib/libc/sys X-SVN-Commit-Revision: 367742 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 03:26:57 -0000 Author: kevans Date: Tue Nov 17 03:26:56 2020 New Revision: 367742 URL: https://svnweb.freebsd.org/changeset/base/367742 Log: _umtx_op: document UMTX_OP_SEM2_WAIT copyout behavior This clever technique to get a time remaining back was added to support sem_clockwait_np. Reviewed by: kib, vangyzen MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D27160 Modified: head/lib/libc/sys/_umtx_op.2 Modified: head/lib/libc/sys/_umtx_op.2 ============================================================================== --- head/lib/libc/sys/_umtx_op.2 Tue Nov 17 02:18:34 2020 (r367741) +++ head/lib/libc/sys/_umtx_op.2 Tue Nov 17 03:26:56 2020 (r367742) @@ -28,7 +28,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 13, 2017 +.Dd November 16, 2020 .Dt _UMTX_OP 2 .Os .Sh NAME @@ -1101,6 +1101,15 @@ The arguments to the request are: .It Fa obj Pointer to the semaphore (of type .Vt struct _usem2 ) . +.It Fa uaddr +Size of the memory passed in via the +.Fa uaddr2 +argument. +.It Fa uaddr2 +Optional pointer to a structure of type +.Vt struct _umtx_time , +which may be followed by a structure of type +.Vt struct timespec . .El .Pp Put the requesting thread onto a sleep queue if the semaphore counter @@ -1124,6 +1133,18 @@ An unblocked signal delivered during such wait results interruption and .Er EINTR error. +.Pp +If +.Dv UMTX_ABSTIME +was not set, and the operation was interrupted and the caller passed in a +.Fa uaddr2 +large enough to hold a +.Vt struct timespec +following the initial +.Vt struct _umtx_time , +then the +.Vt struct timespec +is updated to contain the unslept amount. .It Dv UMTX_OP_SEM2_WAKE Wake up waiters on semaphore lock. The arguments to the request are: