From nobody Sun Nov 2 11:45:11 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1527573624445167.83944314195958; Mon, 28 May 2018 23:00:24 -0700 (PDT) Received: from localhost ([::1]:59055 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNXgC-0005a2-8A for importer@patchew.org; Tue, 29 May 2018 02:00:20 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58761) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNXeG-0004Ki-P9 for qemu-devel@nongnu.org; Tue, 29 May 2018 01:58:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fNXeC-0001Gj-S6 for qemu-devel@nongnu.org; Tue, 29 May 2018 01:58:20 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:59206 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fNXeC-0001GU-O1 for qemu-devel@nongnu.org; Tue, 29 May 2018 01:58:16 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4245F7D839 for ; Tue, 29 May 2018 05:58:16 +0000 (UTC) Received: from xz-mi.nay.redhat.com (dhcp-14-151.nay.redhat.com [10.66.14.151]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5FD8642227; Tue, 29 May 2018 05:58:13 +0000 (UTC) From: Peter Xu To: qemu-devel@nongnu.org Date: Tue, 29 May 2018 13:57:51 +0800 Message-Id: <20180529055755.12404-4-peterx@redhat.com> In-Reply-To: <20180529055755.12404-1-peterx@redhat.com> References: <20180529055755.12404-1-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Tue, 29 May 2018 05:58:16 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Tue, 29 May 2018 05:58:16 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'peterx@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v9 3/7] monitor: more comments on lock-free elements X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Markus Armbruster , peterx@redhat.com, "Dr . David Alan Gilbert" , Stefan Hajnoczi , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Add some explicit comments for both Readline and cpu_set/cpu_get helpers that they do not need the mon_lock protection. Signed-off-by: Peter Xu Reviewed-by: Markus Armbruster Reviewed-by: Stefan Hajnoczi --- monitor.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/monitor.c b/monitor.c index d6c3c08932..f23178951e 100644 --- a/monitor.c +++ b/monitor.c @@ -207,7 +207,15 @@ struct Monitor { int suspend_cnt; /* Needs to be accessed atomically */ bool skip_flush; bool use_io_thr; + + /* + * State used only in the thread "owning" the monitor. + * If @use_io_thr, this is mon_global.mon_iothread. + * Else, it's the main thread. + * These members can be safely accessed without locks. + */ ReadLineState *rs; + MonitorQMP qmp; gchar *mon_cpu_path; BlockCompletionFunc *password_completion_cb; @@ -1313,7 +1321,7 @@ void qmp_qmp_capabilities(bool has_enable, QMPCapabil= ityList *enable, cur_mon->qmp.commands =3D &qmp_commands; } =20 -/* set the current CPU defined by the user */ +/* Set the current CPU defined by the user. Callers must hold BQL. */ int monitor_set_cpu(int cpu_index) { CPUState *cpu; @@ -1327,6 +1335,7 @@ int monitor_set_cpu(int cpu_index) return 0; } =20 +/* Callers must hold BQL. */ static CPUState *mon_get_cpu_sync(bool synchronize) { CPUState *cpu; --=20 2.17.0