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:to:from:subject:date:message-id:mime-version :content-type:content-transfer-encoding; q=dns; s=default; b=XT+ A+Z+oSwKNmW+rrsUHjPRPQPWwmzz4UoG30dJ+D2uk7Ly1LM41ljyjjcA8dEw8l3p 4QOIv+fJS+T8JUz176Uqqm6IGHRg2L175ektOBMYi65uBFCVLK7tF3oOuDLlwzAa 53ZDxAOZ++0csDSiO5r6AR76xsNHbYPZ1Ayh2RVc= 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:to:from:subject:date:message-id:mime-version :content-type:content-transfer-encoding; s=default; bh=Fb34i0CkU oJVM8x1lbYS8X2pyhQ=; b=x8BvKwvFhwFYDW/5zItpOSK7ptDuv8y7xd2WWHczT 6X8KFZTz2DGMBIPB+0VHx8uTdXB7WyqCPfVFBqxgVwqnUwDcsptZcmhe1r1PkVSB 78vJRPLx5oeHC6C29r3PQzv0Rf+Z7oAfBVmp5gocwU8ZIZpuqeZTFnIUB1qrTIWb AI= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com X-Spam-SWARE-Status: No, score=0.4 required=5.0 tests=AWL,BAYES_05,FREEMAIL_FROM,FSL_HELO_BARE_IP_2,RCVD_IN_DNSWL_NONE,RCVD_NUMERIC_HELO,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=no version=3.3.1 To: cygwin AT cygwin DOT com From: jojelino Subject: gdb hangs when it calls tcsetpgrp. Date: Fri, 28 Jun 2013 02:30:42 +0900 Lines: 14 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit User-Agent: Mozilla/5.0 (Windows NT 5.2; rv:24.0) Gecko/20100101 Thunderbird/24.0a1 I was using gdb for debugging ffmpeg raising SIGFPE. but gdb hangs after entering command among of s,n,si,ni. gdb has same pgrp over pgrp of debuggee. when tcsetpgrp is called in gdb, you already know it sends __SIGSETPGRP signal to suspended debuggee. but the debugger already suspended all thread of debuggee without distinguishing whether the victim thread is wait_sig or not. so the suspend process doesn't wake up until debugger handles debug event. which is the cause of hang. Although it seems that cygwin developers have already aware of sort of this issue according to fhandler_termios.cc:85, so, it would be good if cygwin can defer sending signal that would block for sure. -- Regards. -- 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