From patchwork Thu Mar 11 19:52:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 42461 X-Patchwork-Delegate: azanella@linux.vnet.ibm.com Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 58A4B3893C14; Thu, 11 Mar 2021 19:52:20 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 58A4B3893C14 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1615492340; bh=+8BrpZoSeCXPqscJBmsNAQXo5/IWcNcltkp4+M7ZWTc=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=HBT9zQwfCO6/AEdZ6zRw1ySu2RD467gCCcnvcm7S2L0pHkybGBQIDHwhnilkCfr0q p9LRYuTxANpui74EZMeMJQ8CWY6RWpuWptkWdYZsIcsNtnvmoz+ADAlIJFZJM2OcOZ WhlbolrZ0GmhjzNnLezjZIoyrFgzwXxdVy38bFxk= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) by sourceware.org (Postfix) with ESMTPS id 558B53840C25 for ; Thu, 11 Mar 2021 19:52:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 558B53840C25 Received: by mail-qt1-x834.google.com with SMTP id s2so2078642qtx.10 for ; Thu, 11 Mar 2021 11:52:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+8BrpZoSeCXPqscJBmsNAQXo5/IWcNcltkp4+M7ZWTc=; b=jSF/ILPQw6xaGEyjtmNm9BK2I7C4+LGEabS+MV36uBhRyY22pVoh3chAAfhN1iJ2s9 hbvMo2qw1EYZFU26uwUPYNYSSOOgfke2CoZLmS6l4icQGA0nm7lmnfqAcrGsJMvJzV1m LNhpz61HzJhGNudIx6qBNOydkLYIq6b6blO/hqpZ36WB2Yxf3k5IOr8fGgDtdYNwEzJr dFC2LBFYc4INABOjkH5N+L09raKL0/seNI7IQg2U5AUYbUUz6DG+y44BtKLD283Ebl9S HwOah85nPxTAjs/FmoozN+ph/1PHWQGsNC8c+J3rn7cV8zi94/y5N1tEQHa7ltZZ2gkS UCtA== X-Gm-Message-State: AOAM530CMSQPRIuwmhWQgM7J79y3ZVNvbToK9WHNgNTS7hi5KAGdvLOg hHNeGEiQWQvrA00FQ4WRnc/XFUBwz5+/Uacf X-Google-Smtp-Source: ABdhPJzDh1xV0Hp2VCdnKnsoMrHpe2SUucKNojRwPEH6GPR6ZIgyGDBOKCOGSkAaP1BVKZMc329dOA== X-Received: by 2002:ac8:424b:: with SMTP id r11mr9073734qtm.311.1615492335794; Thu, 11 Mar 2021 11:52:15 -0800 (PST) Received: from localhost.localdomain ([177.194.48.209]) by smtp.googlemail.com with ESMTPSA id b16sm2266976qtx.85.2021.03.11.11.52.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Mar 2021 11:52:15 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v2 2/8] linux: Use __libc_single_threaded on fork Date: Thu, 11 Mar 2021 16:52:04 -0300 Message-Id: <20210311195210.3153729-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210311195210.3153729-1-adhemerval.zanella@linaro.org> References: <20210311195210.3153729-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" Changes from v1: * Fix __libc_single_threaded backwards usage. --- Checked on x86_64-linux-gnu. --- sysdeps/nptl/fork.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sysdeps/nptl/fork.c b/sysdeps/nptl/fork.c index 4fb4c2d254..f78267b68c 100644 --- a/sysdeps/nptl/fork.c +++ b/sysdeps/nptl/fork.c @@ -34,6 +34,7 @@ #include #include #include +#include static void fresetlockfiles (void) @@ -55,7 +56,7 @@ __libc_fork (void) handlers in the single-thread case, to make fork safer to use in signal handlers. POSIX requires that fork is async-signal-safe, but our current fork implementation is not. */ - bool multiple_threads = THREAD_GETMEM (THREAD_SELF, header.multiple_threads); + bool multiple_threads = __libc_single_threaded == 0; __run_fork_handlers (atfork_run_prepare, multiple_threads);