X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:reply-to:to:subject:date:message-id
	:content-type:content-transfer-encoding:mime-version; q=dns; s=
	default; b=Fj25HwsOB+ariJvBGn2bJiBoN5ar7M6+Hw+YLQWDAL42h1JReelKp
	7+UlZqg5i8w4GFjtzLjFteWoahq0QWC6IjK+9Xjncz9kysMtJNRh0rD+c8DP0bXY
	JUauQl8EA+6X6u1HB2LnYB2uWGKXdSqLEt4EWO0wJWgHwc0nqXG/bA=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:reply-to:to:subject:date:message-id
	:content-type:content-transfer-encoding:mime-version; s=default;
	bh=adzufVKWOXvKgeWnPRShjjtcYPA=; b=MNF1U0INzWi+WoJ3CAwcrGcEZTib
	Q+l4p65VRje40JrKVJv46ll4NoxjkzNw14vvc+PTIVQbL8mnTZvfUMgjKB/z3Aag
	rXOUQwAWnUlTpZHPBoS4JDTg2c4GVAS/AZUd+Rgrglm8gz3BWlzD9j7MwDM5n2ZI
	CHl7fgjxN7MgCJA=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Spam-SWARE-Status:	No, score=-2.2 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.1 spammy=screw, insane, thousands, intensive
X-HELO:	nihcesxwayst06.hub.nih.gov
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=nih.gov; i=@nih.gov; q=dns/txt; s=NIH; t=1565200859; x=1596736859; h=from:to:subject:date:message-id: content-transfer-encoding:mime-version; bh=b9SsejID8Uk3+yfG6Ym/XOsAyZx7SFzLZNXcWUyFjXU=; b=GU7VHUNvsWZXuHANd0sGfuH/uIcmmz110YF4IPFb3RjsGjCu9oPqB4KZ kP+On7preK3K+Mxit6/bFC+kWfcPTPDA/xThNvP4DSqmhVD8j1RZrnPbU dOxykf2rAIEQcu8L9NijXCmM/VMsVFuplNDNJpKJchhfUWpRGfpDtaYMx YSnDjENQRlqZvAw4UuHJTg9W8hmqrG48wtGGK8emJU0n1Amqcz3dEjR6X 8oNNsRGNP9FXv7q+YVPzRGrdhBL6vJ6ITrBsyyH8ZosHHSA7o7aXH07aA Oa7wQzG8cJHWm4S0kJQb9kw3/tNg+SFGF89IOK8x9aj8/GAFzOwq21/MM w==;
IronPort-SDR:	njGz/iu4lcMnvBlRqKiMIKc0cFjf9vcF0qLeTCJVRSrxEY2tA14QdGS9hRdP/6Nszqi3rmCSGv 4wSfRThz18Gg==
ARC-Seal:	i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=GzPOQn+nLUngqPwPKK1k8gvJdmDO0lS/Sv0PORBfldR4A3dc8cT37WT1WU8FGD4o8kDW6ggpk6QzDB3PASrZT+k2/CGYRqeBzdd53rO0qlvUHjE9TrWMAfU/IMuoRJx05ssbYyZPKm1nVy7Klr+WpDuZcKfEerdgppasenAWSPxcgu9zAFZ8vCoF3cjBWM83HrFPvpLMb4jKwv0bIYleJate3eHkwn1Jqgmq19FgJzzvw5is17OiMa2JBzyX8cVdRB4fxVOAaDxOYufnbetvMG3laTJozra16ItKIT4Sq1ds5qmbgruoAAW8pPcbVogoN0NQ2+W4EMiMuroIQX0XFA==
ARC-Message-Signature:	i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=b9SsejID8Uk3+yfG6Ym/XOsAyZx7SFzLZNXcWUyFjXU=; b=TB5mGcV7isLXdlS1B5usLQCmqvkAYO2IsvRoCONgYUK7uU5wqBwA4EgmBHVXanoqJY4LAg18/Lsy+5zMNu0WlV8nTKl3/hBKaAicNF60mfuzK12zbejK8S4kqx3PAL+Pz3l+eELVByIGANkf7aNNGTyAtf87PqVGRwlKML68ZcKqxte6uI4T+1N53yZn7NgqXiJ7OpnkheQKcVNPG8slW5AtqGcexB7RM5UGOhI2Yv5j2oBajsCSx7vP7YoQybC/l6tCZLXtwOXloGjm8Cllhy3LAJa4f8t2G6gtcgreW2rlraKrv96EdIabo/BcmA1M0LcYxvPcmK4kG5ZRt6v5Dw==
ARC-Authentication-Results:	i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=ncbi.nlm.nih.gov; dmarc=pass action=none header.from=ncbi.nlm.nih.gov; dkim=pass header.d=ncbi.nlm.nih.gov; arc=none
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=nih.onmicrosoft.com; s=selector1-nih-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=b9SsejID8Uk3+yfG6Ym/XOsAyZx7SFzLZNXcWUyFjXU=; b=d8S8CwxsVTwqboL6RygKMh9B1Nwx4U12rJBffmfMH10XK98EEYCjQSCD5zP++YGNu+Bs4WVqSe5ocShlrVEnTFSauiooyyf5mZuFIWu6pn6XwzreXqsdsytDV9AGjsT7nnxgxSqPOKeRD2EDd5jC/tLfOA6plsddxPhTfwzDTdY=
From:	"Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin" <cygwin AT cygwin DOT com>
Reply-To:	"Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
To:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject:	Re: semget() returns EAGAIN?
Date:	Wed, 7 Aug 2019 18:00:46 +0000
Message-ID:	<BL0PR0901MB430859E39E94D50ABC15537FA5D40@BL0PR0901MB4308.namprd09.prod.outlook.com>
authentication-results:	spf=none (sender IP is ) smtp.mailfrom=lavr AT ncbi DOT nlm DOT nih DOT gov;
x-ms-oob-tlc-oobclassifiers:	OLM:318;
x-ms-exchange-senderadcheck:	1
x-ms-exchange-transport-forked:	True
MIME-Version:	1.0
X-MS-Exchange-CrossTenant-mailboxtype:	HOSTED
X-MS-Exchange-CrossTenant-userprincipalname:	f5TmENpGFchDTlER34pCJDRy61N/Xuscs80JiSByOJTEzXqXx3KRFNIRpZBuhP4Q
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id x77I1c6L019103

> The number of parallel open pipes, for instance.  By default, 10
> worker threads handle the load and up to 62 processes can be handled
> in parallel.

Hmm, so it is not an OS-imposed restriction...  Then I don't understand why it wasn't made to "just work":
to create a thread per client until that works, without having to have any pre-set limits.  Fail only if
the thread creation cannot be done.

> Apart from that, the preferred way to use semaphores is to use POSIX
> semaphores, that is, sem_open and friends.

Well, that's not entirely up to me, the app is already using (quite stably!) SYSV semaphore _arrays_ so switching to POSIX
would require some porting (and intensive bug checking -- provided that the app is being used on thousands of hosts).
Besides, TBH it looks like the POSIX-devising people were smoking some kind of weed when coming up with sem_timedwait() using
_absolute_ timeouts!  That's way too insane.  They also tried to screw up SYSV sems by saying they get created not necessarily
initialized (what's the point?! it totally defeats the purpose!)  TG, by then many systems had already had them implemented
decently (reset to 0 upon inception), so that "clause" did not have any chance to actually realize.


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

- Raw text -