From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ken Brown Newsgroups: gmane.emacs.bugs Subject: bug#50043: 28.0.50; USABLE_SIGOI undef code paths do not work correctly Date: Wed, 17 Nov 2021 09:59:35 -0500 Message-ID: <4a256b21-ec50-90f8-b472-079fa98969b2@cornell.edu> References: <874kbtfthj.fsf@gnus.org> <835yw9cwoa.fsf@gnu.org> <87mtpla013.fsf@gnus.org> <83zgtlbaw6.fsf@gnu.org> <87fsvcuttw.fsf@gnus.org> <83czn12uz1.fsf@gnu.org> <837dd80zc7.fsf@gnu.org> <92d3e509-be73-88c8-0085-f13c3716dd1b@cornell.edu> <83sfvuzzy5.fsf@gnu.org> <83ee7ezw8l.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14378"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.1 Cc: larsi@gnus.org, 50043@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Nov 17 16:01:54 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mnMRb-0003Pk-Q5 for geb-bug-gnu-emacs@m.gmane-mx.org; 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CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BN7PR04MB4388.namprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(5660300002)(508600001)(2616005)(8936002)(36756003)(4326008)(86362001)(83380400001)(6916009)(6486002)(66556008)(66476007)(8676002)(66946007)(316002)(38100700002)(2906002)(186003)(53546011)(786003)(75432002)(31696002)(31686004)(45980500001)(43740500002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: +RG3gS43ati5EitPyM3NmZQCfzSOeOG+2ufGIYQFYx3W4NEeb08JODR4HDRBiyoQn2VZhp0VpGA1ep0xW77QeqQg/6vlYgnyeDtJ8kd+NN73j7jlIJcS9kvS672GveTeTnZwlwcTEFtnpc1rFWJZdZFY227/cm35Y0yiKXrJdYqgNKNWcyPbZVxVKiroXklbD2R/q3/mO2OjAsCArWGL34aR+WJNXw4mko4JWVYc9L2CVqSzztsZJUuxmCKqYj+cO4hDLSR+Tq4nx0TVPAtn9pplRZrkxGD5GOSlCO1NtHj+nozf+JjRmRqgwRcXQb7K/UNcp3xfHbRSliPTKzkq6M40M6CMIVB6+cQMy1jnEGPTEiON4Ocqwu83DyFmeBB1n/ykrR7XDqLDMZ6k8Vk7wnFo+bTadfJC+KyliieExAVg6aBXxe+R7oKXllvJEpxjtMq0irRKS3+QO0SCf6/pq7toB3+Q9Cx77cg4Yn8x97YCIcuZYm1d5E5OVra9NREWrzn2uvzcu6q17nK3wz+kjrDrlIEyg1rQcdbC6LxiSbESMoFrPWKPs/LScvbEHxhIJuvvsxwcZIRrd4jrhxXkfMHMygU2jHjjJ2fMBrpEQLEt/wBlTz4kBcrVp8ywRsMOFUnIlfUyKuMSomSgNohLPN8Y5oCdz3YkyavLwHfAwWgfe7fIrtEN6waqHw2H31fD05G9Xyy62TYGM8DIQY2e/dUq54QkiWkfFFQrB6jbwhMVz3P3VuxKYif7CA mbuORI75BrTjvQVHLtUmk1C7AQnsoGFuMz4g1RkYCjpMz0zoLBCmB+OcbdpD+CnkPMvrMHptt7E+C3N117ChHCHSCF3a5Jyzba X-OriginatorOrg: cornell.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 4315f8bd-7e15-498b-efcd-08d9a9dadf88 X-MS-Exchange-CrossTenant-AuthSource: BN7PR04MB4388.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2021 14:59:36.9423 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5d7e4366-1b9b-45cf-8e79-b14b27df46e1 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: T70v4Qphlwl6H7ONWrLFu6gOkBFQU1KWk44sWHOrnOmuo54ypFgwEdo/7z1djSFP6GraDNsPX6cAFHuZjBUGPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR04MB2324 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:220209 Archived-At: On 11/17/2021 9:34 AM, Eli Zaretskii wrote: >> Date: Wed, 17 Nov 2021 09:19:27 -0500 >> Cc: larsi@gnus.org, 50043@debbugs.gnu.org >> From: Ken Brown >> >>> What is that more general problem, and when does it rear its ugly >>> head? >> >> The problem is that whenever wait_reading_process_output needs to repeatedly >> check for input (i.e., read_kbd || !NILP (wait_for_cell) == true), it can get >> stuck in select for up to 2 seconds on systems without USABLE_SIGIO. (2 arises >> here because it's the default value of polling-period.) > > But that can only happen if select is called with a long enough > timeout, right? Right. > Anyway, if the problem is that on these systems select doesn't return > when there are input events waiting, I guess it's okay to do the > change there. Thanks. > But maybe it will be better to do it the same way we > decrease the timeout when a timer is expected to expire before the > timeout: we decrease the timeout, but still remember its value, and > don't return from waiting before the timeout unless there really was > some input. This would avoid affecting unrelated features such as > accept-process-output. I think that's already taken care of. The timeout is recalculated on each iteration of the main while loop: /* Compute time from now till when time limit is up. */ /* Exit if already run out. */ if (wait == TIMEOUT) { if (!timespec_valid_p (now)) now = current_timespec (); if (timespec_cmp (end_time, now) <= 0) break; timeout = timespec_sub (end_time, now); } else timeout = make_timespec (wait < TIMEOUT ? 0 : 100000, 0); My reduction of timeout to 25 msec occurs after this. Ken