From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.polymtl.ca (smtp.polymtl.ca [132.207.4.11]) by sourceware.org (Postfix) with ESMTPS id BDF8C3857407 for ; Fri, 30 Jul 2021 01:27:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org BDF8C3857407 Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id 16U1RRel009384 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Jul 2021 21:27:32 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp.polymtl.ca 16U1RRel009384 Received: from [10.0.0.11] (192-222-157-6.qc.cable.ebox.net [192.222.157.6]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by simark.ca (Postfix) with ESMTPSA id 49B301E813; Thu, 29 Jul 2021 21:27:27 -0400 (EDT) Subject: Re: [PATCH v2 3/5] obsd-nat: Various fixes to obsd_nat_target::wait. To: John Baldwin , gdb-patches@sourceware.org References: <20210727174110.62480-1-jhb@FreeBSD.org> <20210727174110.62480-4-jhb@FreeBSD.org> <6257bdce-d9f7-af41-035f-a982094225c5@polymtl.ca> <8fae24b5-9fb1-d49b-f33b-b3934a9954be@polymtl.ca> <13d25a9d-2169-5a31-952c-f5006430047a@FreeBSD.org> From: Simon Marchi Message-ID: <88b8f896-b59b-35de-a53a-253671032495@polymtl.ca> Date: Thu, 29 Jul 2021 21:27:27 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <13d25a9d-2169-5a31-952c-f5006430047a@FreeBSD.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Fri, 30 Jul 2021 01:27:27 +0000 X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Jul 2021 01:27:34 -0000 > To be clear though, the BSD's report a pid from waitpid(). Threads > on Free/Net/OpenBSD use an orthogonal namespace for thread IDs that > is separate from process IDs and there are 1 or more thread IDs > associated with each process. On FreeBSD, thread IDs start at PID_MAX + 1, > and there are a few places in FreeBSD where one can use either a thread > ID or process ID (ptrace() is one syscall for which this is true). The > kernel compares the value against PID_MAX in those cases to determine if > it is a thread (LWP) ID or process ID. Ah, thanks. I knew about NetBSD because Kamil mentioned it, I didn't know it was somewhat similar across BSDs. Simon