From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 42610 invoked by alias); 18 Jan 2016 12:37:31 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Received: (qmail 42581 invoked by uid 89); 18 Jan 2016 12:37:30 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=1.0 required=5.0 tests=BAYES_20,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=no version=3.3.2 spammy=libthread_db, user-space, Older, backed X-Spam-User: qpsmtpd, 2 recipients X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Mon, 18 Jan 2016 12:37:29 +0000 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id 8AC94743; Mon, 18 Jan 2016 12:37:28 +0000 (UTC) Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u0ICbQil025775; Mon, 18 Jan 2016 07:37:27 -0500 Message-ID: <569CDC86.6090003@redhat.com> Date: Mon, 18 Jan 2016 12:37:00 -0000 From: Pedro Alves User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: John Baldwin , gdb-patches@sourceware.org, binutils@sourceware.org, Eli Zaretskii Subject: Re: [PATCH v3 5/6] Add support for LWP-based threads on FreeBSD. References: <1453084047-16175-1-git-send-email-jhb@FreeBSD.org> <1453084047-16175-6-git-send-email-jhb@FreeBSD.org> In-Reply-To: <1453084047-16175-6-git-send-email-jhb@FreeBSD.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-SW-Source: 2016-01/txt/msg00374.txt.bz2 Eli, this revision includes NEWS/docs bits. On 01/18/2016 02:27 AM, John Baldwin wrote: > Older versions of FreeBSD supported userland threading via a pure > user-space threading library (N threads scheduled on 1 process) and > a N:M model (N threads scheduled on M LWPs). However, modern FreeBSD > versions only support a M:M threading model where each user thread is > backed by a dedicated LWP. This thread target only supports this > threading model. It also uses ptrace to query and alter LWP state > directly rather than using libthread_db to simplify the implementation. > > FreeBSD recently gained support for reporting LWP events (birth and death > of LWPs). GDB will use LWP events when present. For older systems it > fetches the list of LWPs in the to_update_thread_list target op to update > the list of threads on each stop. > > This target supports scheduler locking by using ptrace to suspend > individual LWPs as necessary before resuming a process. Code changes LGTM. Thanks, Pedro Alves