From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id D92323858C74 for ; Wed, 9 Feb 2022 17:35:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D92323858C74 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-102-kEEo4_HlMA-4VvAixtEOkQ-1; Wed, 09 Feb 2022 12:35:13 -0500 X-MC-Unique: kEEo4_HlMA-4VvAixtEOkQ-1 Received: by mail-oo1-f72.google.com with SMTP id v10-20020a4ade8a000000b003177422e81dso1957030oou.3 for ; Wed, 09 Feb 2022 09:35:13 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=4MGDfMNvhuGuTb/2yhj1kvScPxkI3sxyzS5cz1NjMoc=; b=2KpzmFseFGICIHyzaq7kIEhNA1210HJGksWPjb5qdKdWWXBqUPWqp2dMw27AuPvlaA EENoG39ADcYBYcH9F6ShKiyRLK415JPsvJGtrhOnZeTjJnMdJTSKRtiY3YioTU06wRVN FJw8wpjvx9A3SKFhjsQVdnyK9PC4jSNf5FooBUFNhoq28aHANCi/nToKE6VaNsMHMaLg bSbHarMFebp+E/nl6DL4eJDWWWN9JbkuteipP0KkKXH3DBlG59uCNedS7fRUBQrrzLCB MJym99PGgwM4UJbSnu0aWIC/++AQRU6P653lkKYqnx8z2T3ecyrgbspkWH8Su6hV1Tq8 6pNg== X-Gm-Message-State: AOAM5328dP/An55ipckEuTmP0oTKoJUXy/2IY44s+SIlKJ9b/FuabytY xW8A/9a5wZPoa+QaMIGk3Sy18MUti5wx1e2oboII0nEr5EhX3FB/Pvq6maxBAwsMRuDb5gxg6gq CJmos1uSj5bZUXhk+W8VRzA172Fof0m+qYg== X-Received: by 2002:a05:6830:4409:: with SMTP id q9mr1387470otv.316.1644428113021; Wed, 09 Feb 2022 09:35:13 -0800 (PST) X-Google-Smtp-Source: ABdhPJy5NelnpspC9ZnMs2DFIiSj/QIlg0+5evk+hRttYQxxatBl2+DkQLITRuhSE1Jit+nkRCeJSP7Yutzy1FVx2Ig= X-Received: by 2002:a05:6830:4409:: with SMTP id q9mr1387455otv.316.1644428112775; Wed, 09 Feb 2022 09:35:12 -0800 (PST) MIME-Version: 1.0 From: Thomas Rodgers Date: Wed, 9 Feb 2022 09:35:02 -0800 Message-ID: Subject: [PATCH] libstdc++: Strengthen memory order for atomic::wait/notify To: "libstdc++" Cc: gcc Patches X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="00000000000085771905d79941f4" X-Spam-Status: No, score=-14.1 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, HTML_MESSAGE, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Feb 2022 17:35:17 -0000 --00000000000085771905d79941f4 Content-Type: text/plain; charset="UTF-8" This patch changes the memory order used in the spin wait code to match that of libc++. --00000000000085771905d79941f4 Content-Type: text/x-patch; charset="US-ASCII"; name="0001-libstdc-Strengthen-memory-order-for-atomic-T-wait-no.patch" Content-Disposition: attachment; filename="0001-libstdc-Strengthen-memory-order-for-atomic-T-wait-no.patch" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_kzfu13f40 RnJvbSA5MmNhYTA4YjI3MjUyMGVjNGEyNzJiMzAyYjM3ZDhmYjQ3YWZiMmFiIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBUaG9tYXMgUm9kZ2VycyA8cm9kZ2VydEBhcHBsaWFudG9sb2d5 LmNvbT4KRGF0ZTogV2VkLCA5IEZlYiAyMDIyIDA5OjI2OjAwIC0wODAwClN1YmplY3Q6IFtQQVRD SF0gbGlic3RkYysrOiBTdHJlbmd0aGVuIG1lbW9yeSBvcmRlciBmb3IgYXRvbWljPFQ+Ojp3YWl0 L25vdGlmeQogKHNwaW5uaW5nKQoKVGhpcyBwYXRjaCBjaGFuZ2VzIHRoZSBtZW1vcnkgb3JkZXIg dXNlZCBpbiB0aGUgc3BpbiB3YWl0IGNvZGUgdG8gbWF0Y2gKdGhhdCBvZiBsaWJjKysuCgpsaWJz dGRjKystdjMvQ2hhbmdlTG9nOgoJKiBpbmNsdWQvYml0cy9hdG9taWNfd2FpdC5oIChfX3dhaXRl cl9iYXNlOjpfU19kb19zcGluLAoJX193YWl0ZXJfYmFzZTo6X1NfZG9fc3Bpbl92KTogQ2hhbmdl IG1lbW9yeSBvcmRlciBmcm9tIHJlbGF4ZWQKCXRvIGFjcXVpcmUuCi0tLQogbGlic3RkYysrLXYz L2luY2x1ZGUvYml0cy9hdG9taWNfd2FpdC5oIHwgNCArKy0tCiAxIGZpbGUgY2hhbmdlZCwgMiBp bnNlcnRpb25zKCspLCAyIGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2xpYnN0ZGMrKy12My9p bmNsdWRlL2JpdHMvYXRvbWljX3dhaXQuaCBiL2xpYnN0ZGMrKy12My9pbmNsdWRlL2JpdHMvYXRv bWljX3dhaXQuaAppbmRleCA2Y2U3ZjkzNDNjZi4uMTI1YjFjYWQ4ODYgMTAwNjQ0Ci0tLSBhL2xp YnN0ZGMrKy12My9pbmNsdWRlL2JpdHMvYXRvbWljX3dhaXQuaAorKysgYi9saWJzdGRjKystdjMv aW5jbHVkZS9iaXRzL2F0b21pY193YWl0LmgKQEAgLTMzMiw3ICszMzIsNyBAQCBfR0xJQkNYWF9C RUdJTl9OQU1FU1BBQ0VfVkVSU0lPTgogCSAgICAgIH0KIAkgICAgZWxzZQogCSAgICAgIHsKLQkJ X19hdG9taWNfbG9hZChfX2FkZHIsICZfX3ZhbCwgX19BVE9NSUNfUkVMQVhFRCk7CisJCV9fYXRv bWljX2xvYWQoX19hZGRyLCAmX192YWwsIF9fQVRPTUlDX0FDUVVJUkUpOwogCSAgICAgIH0KIAkg ICAgcmV0dXJuIF9fYXRvbWljX3NwaW4oX19wcmVkLCBfX3NwaW4pOwogCSAgfQpAQCAtMzUzLDcg KzM1Myw3IEBAIF9HTElCQ1hYX0JFR0lOX05BTUVTUEFDRV9WRVJTSU9OCiAJCSAgICAgX19wbGF0 Zm9ybV93YWl0X3QmIF9fdmFsLAogCQkgICAgIF9TcGluIF9fc3BpbiA9IF9TcGlueyB9KQogCSAg ewotCSAgICBfX2F0b21pY19sb2FkKF9fYWRkciwgJl9fdmFsLCBfX0FUT01JQ19SRUxBWEVEKTsK KwkgICAgX19hdG9taWNfbG9hZChfX2FkZHIsICZfX3ZhbCwgX19BVE9NSUNfQUNRVUlSRSk7CiAJ ICAgIHJldHVybiBfX2F0b21pY19zcGluKF9fcHJlZCwgX19zcGluKTsKIAkgIH0KIAotLSAKMi4z NC4xCgo= --00000000000085771905d79941f4--