X-Recipient: archive-cygwin AT delorie DOT com
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 500973858002
Authentication-Results: sourceware.org; dmarc=none (p=none dis=none)
 header.from=SystematicSw.ab.ca
Authentication-Results: sourceware.org;
 spf=none smtp.mailfrom=systematicsw.ab.ca
X-Authority-Analysis: v=2.4 cv=Y6brDzSN c=1 sm=1 tr=0 ts=623a0cc3
 a=oHm12aVswOWz6TMtn9zYKg==:117 a=oHm12aVswOWz6TMtn9zYKg==:17
 a=IkcTkHD0fZMA:10 a=VwQbUJbxAAAA:8 a=D19gQVrFAAAA:8 a=94nOnFI1EgyDtX4ev68A:9
 a=QEXdDO2ut3YA:10 a=AjGcO6oz07-iQ99wixmX:22 a=W4TVW4IDbPiebHqcZpNg:22
Message-ID: <638af4ef-e741-6ab1-6dfa-e64684e32f9e@SystematicSw.ab.ca>
Date: Tue, 22 Mar 2022 11:52:03 -0600
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.7.0
Subject: Re: GNU make losing jobserver tokens in pipes
Content-Language: en-CA
To: cygwin AT cygwin DOT com
References: <9b9da583-124d-9d5f-4c10-6622602ca8dc AT oracle DOT com>
 <09d8cb84-b3e3-0760-2245-0f3d2154c023 AT cornell DOT edu>
 <1a25a77b-b1de-edc0-974f-937e914d05fd AT gmail DOT com>
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Organization: Systematic Software
In-Reply-To: <1a25a77b-b1de-edc0-974f-937e914d05fd@gmail.com>
X-CMAE-Envelope: MS4xfFYlr/w+3exrPYuxfjv/Mu2e27uiKdfsUhS/P0ZMMnLHbeiKCttOcoM/ykmkxLbZJyXBKWWXcvPT3jkzXYg+BeyijWoDMvRz5pLs4C3DTZRvDqWloGCw
 Z1K1RvUY1MMZjb3w0vefhJYDxAOvGUHwW4pfv7pmpJwrSir7733MXMCIu30RYfXN5sRJfDL1QS78dcXqGc5HFo7hmloLGm8DGZ4=
X-Spam-Status: No, score=-1164.1 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS,
 KAM_LAZY_DOMAIN_SECURITY, KAM_SHORT, NICE_REPLY_A, RCVD_IN_DNSWL_LOW,
 RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Reply-To: cygwin AT cygwin DOT com
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On 2022-03-22 00:54, Noel Grandin wrote:
> On 2022/03/21 5:09 pm, Ken Brown wrote:
>> On 3/21/2022 10:28 AM, Magnus Ihse Bursie wrote:
>>> We have had a long-standing issue with make losing jobserver tokens. 
>>> ("long-standing" here means for years, and years, at least since GNU 
>>> make 4.0, up to and including the current latest version in Cygwin.)

> It was not that long ago that Linus Torvalds found a bug in the Linux 
> kernel pipe implementation which caused GNU make to lose jobserver 
> tokens, so possibly researching that bug may shed some light on the 
> kinds of things that could be wrong with the Cygwin pipe code.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ddad21d3e99c743a3aa473121dc5561679e26bb 
> 
> https://lkml.org/lkml/2019/12/18/1064

Perhaps add "in pipes" to subject to get that maintainer's attention?

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple