220 39737 <0ecc7780-0359-460f-9ff0-7ab722658790@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Niall Douglas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: D1095R0/N2xxx draft 4: Zero overhead deterministic failure - A unified mechanism for C and C++ Date: Sun, 12 Aug 2018 15:19:16 -0700 (PDT) Lines: 69 Approved: news@gmane.org Message-ID: <0ecc7780-0359-460f-9ff0-7ab722658790@isocpp.org> References: <206ed6c7-67da-43db-8d21-5d2a359b19b0@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1315_399442818.1534112356145" X-Trace: blaine.gmane.org 1534112231 23868 195.159.176.226 (12 Aug 2018 22:17:11 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 12 Aug 2018 22:17:11 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDGKFT5YZADRBZHEYLNQKGQESB5W7KQ@isocpp.org Mon Aug 13 00:17:07 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw1-f71.google.com ([209.85.161.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1foyfb-000676-40 for gclcip-std-proposals@m.gmane.org; Mon, 13 Aug 2018 00:17:07 +0200 Original-Received: by mail-yw1-f71.google.com with SMTP id r144-v6sf20772699ywg.9 for ; Sun, 12 Aug 2018 15:19:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=szeM8b9ExfwaOhTOh+0XbXCWd4v/n9UJ7sxczbN4XCc=; b=cmrGQIIuasMsN9BcIFgGRFYqTx31cBKvxnaWlxUb3t/SHKEQM2kfRX+vT0k0E04duH 1oTPWO5EK5j5cgHfJ+KiSrzgER968QBOcd92owuYqncdHao2T99F2Q/NQvHzwnKRZk2l 5H8Yr79kML4ItIECFUNQw7Kcg59N43KcGLgKZq7g6fpV8TGa0vB65kxV5VbdhOVtaMwK tuEQ6GIRYslYlgF0kjz8mlw3EEIpB1RyTUoF6lAnf3z+nSS8CK8oJqq6ODUl4ED/vKeN FhrDnC2v/NScv6tBmMAuipgf//B40jd/BbMS3eNlR6ahijwadIu2LXawndrSni+UqAlM brsA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=szeM8b9ExfwaOhTOh+0XbXCWd4v/n9UJ7sxczbN4XCc=; b=iebYQGkt+jjeeIplugTAGx90KUJhFq1nC/BUthqjeD5erw/Ihv3y9r39FjNLnMEFNb grgMuhOlio7k/kICaeviJMj0XC+fgqGh7mdUV2/735QK+xI3TIrp3fCJ991wV6syXG1C iKltkoXNlXWbQMlEQ8JVsC/QOoy/rY/3dCjY4yOTAZ3zkobYsDLf3nRF2YcD9eLxbPRC oM6fiI9CLEBrpDYRAXHCl16e3qTb4u9BARiZ0CRxsejHVU3U65Tr019UXln1H6kJRN29 4z+q8v+YWxNKlnw0JT2e5HqCmq0dg9iuvz3rUlpdiwnyTvRjC4jmlJN1Lh3q+GWVhTaS 9xTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=szeM8b9ExfwaOhTOh+0XbXCWd4v/n9UJ7sxczbN4XCc=; b=fVxcgx0edunBDOqtcRL+mUTrkHy8jrlJK8qdoid7qN/pJHxjabAHnL8xOPdEKbRP+g QKwfuNsDyP+1JuYxv4HRHAoCzLABfpKnOrlsHERx/kxlz5xq8pH3H7ZK907j6jgELt0X NFHEQxKWlXPX5ErKTMXrCvzZ6js/jTJ415WvQCLr3AlrzozmHQzUEjZMpt9w3NENeoYK zvJ6wdoSCTcs3Hs+noo68g/v3pgJb3v2A1QyElVgsN4mk3U2hF3bHzMYs5dKEUUvvPg3 qcn480DCC1x2Ub/u07SKD2d2pgpKRI2zhITPkuHJ9EhmKeQOXx4dxHFiQCdwQUQ82zTL 9Fxg== X-Gm-Message-State: AOUpUlF0bSO93WoS1hJDBdGU/Q4rrPqju0+wgr5UY31rdFoGgw08T9xL ggVN1vUdw6W1FSNvEy849cMq3A== X-Google-Smtp-Source: AA+uWPwpC1BITpyhodnqEgfNEePKhq2edcu4y1vdyR8MTb74c70qaA0rJdZwmKKsDefiXLSKQsKUQg== X-Received: by 2002:a81:5295:: with SMTP id g143-v6mr5061892ywb.142.1534112357406; Sun, 12 Aug 2018 15:19:17 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:a08f:: with SMTP id x137-v6ls2291765ywg.37.gmail; Sun, 12 Aug 2018 15:19:16 -0700 (PDT) X-Received: by 2002:a81:63d5:: with SMTP id x204-v6mr319963ywb.5.1534112356608; Sun, 12 Aug 2018 15:19:16 -0700 (PDT) In-Reply-To: X-Original-Sender: nialldouglas14@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:39737 Archived-At: ------=_Part_1315_399442818.1534112356145 Content-Type: multipart/alternative; boundary="----=_Part_1316_1255740024.1534112356146" ------=_Part_1316_1255740024.1534112356146 Content-Type: text/plain; charset="UTF-8" > > > How `std::uncaught_exceptions` will exactly work with value exception? You > mentioned overhead of cold cache, but it will be implemented in this or > this is thing you want avoid? > > Me personally, I'd like std::uncaught_exceptions to apply to type-based exception throws only, and not drag down all value-based exception throws with latency just for the 0.01% of users which ever use std::uncaught_exceptions. It could maybe be enabled with a compiler option. But assuming WG21 won't go for that, my proposal is that the TLS reference counting only apply to std::error, it is not available under Freestanding C++, and can be disabled at the command line. Niall -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/0ecc7780-0359-460f-9ff0-7ab722658790%40isocpp.org. ------=_Part_1316_1255740024.1534112356146 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

How `std::uncaught_exceptions`=20 will exactly work with value exception? You mentioned overhead of cold=20 cache, but it will be implemented in this or this is thing you want=20 avoid?

Me personally, I'd l= ike std::uncaught_exceptions to apply to type-based exception throws only, = and not drag down all value-based exception throws with latency just for th= e 0.01% of users which ever use std::uncaught_exceptions. It could maybe be= enabled with a compiler option.

But assuming WG21= won't go for that, my proposal is that the TLS reference counting only= apply to std::error, it is not available under Freestanding C++, and can b= e disabled at the command line.

Niall

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