Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Message-ID: <3C0FB399.2020300@ece.gatech.edu> Date: Thu, 06 Dec 2001 13:06:17 -0500 From: Charles Wilson User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010914 X-Accept-Language: en-us MIME-Version: 1.0 To: Jason Tishler CC: Michael Hudson , david_abrahams@users.sourceforge.net, Cygwin Subject: Re: dll_list::load_after_fork() blues (was Re: [ python-Bugs-489709 ] Building Fails ...) References: <20011206124426.B1448@dothill.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-milter (http://amavis.org/) Jason Tishler wrote: >> >>building 'gdbm' extension >>gcc -g -O3 -Wall -Wstrict-prototypes -DUSE_DL_IMPORT -I. -I/cygdrive/e/Python-2.2b2/./Include -I/usr/local/include -IInclude/ -c /cygdrive/e/Python-2.2b2/Modules/gdbmmodule.c -o build/temp.cygwin-1.3.5-i686-2.2/gdbmmodule.o >>e:\buildpy\python.exe: *** unable to remap >>C:\cygnus\bin\cygssl.dll to same address as parent -- 0x1A7C0000 >> 0 [main] python 1292 sync_with_child: child 1108 (0xF0) died before initialization with status code 0x1 >> 25901 [main] python 1292 sync_with_child: *** child state child loading dlls >>error: Resource temporarily unavailable >>make: *** [sharedmods] Error 1 >> > > The above occurs during Cygwin's fork() when the Cygwin DLL cannot > load a DLL to the same address in the child that it had in the parent. > I have seen this during Python 2.1.1 regression tests with threads > enabled. Part of the problem may be that cyggdbm.dll was built with --auto-image-base. It was later demonstrated that this can cause problems with fork; you're better off just letting ld assign the default dllbase, which means that EVERY process will remap the dll at runtime. Thus, no hardcoded conflicts. Downside: *very* slightly delay in loading DLLs -- probably unnoticeable. (Did I get that right, robert?) Anyway, I plan to redo cyggdbm "eventually" without the --auto-image-base. Doing so *may* fix this problem, but I'm not sure... --Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/