Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm 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 From: jurgen DOT defurne AT philips DOT com To: cygwin AT cygwin DOT com Subject: Subprocess fork problem MIME-Version: 1.0 Message-ID: Date: Wed, 3 Sep 2003 09:10:23 +0200 Content-Type: text/plain; charset="us-ascii" Hello, I am trying to write a Perl program which needs to execute some processes (builds) in parallel. This program is started in the following process hierarchy : - A running cygwin background process, which starts - The main build control process, still cygwin, which starts - nmake Through setting the variable PARALLEL, the targets which have to be built are changed, and for a PARALLEL build, a new cygwin script is started, but this time through the command shell, using ftype and assoc, instead of through cygwin. This script needs to fork some parallel processes, waits for one to terminate (waitpid(-1, &WNOHANG), then starts another one, and so on, until the complete batch of process is done. These parallel processes should redirect their stdout and stderr to a logfile, so I do open(STDOUT, ">", $logfile); When I do not do the redirect, all is well. When I do redirect the standard files I get the following error(s) : 679 [proc] perl 1972 wait_subproc: wait failed. nchildren 1, wait 1000, Win32 error 6 729 [proc] perl 1972 wait_subproc: nchildren 1, event[1] 0x104, pchildren[0] 0xCB0000, events[0] 0x20, Win32 error 6 18491 [proc] perl 1972 wait_subproc: pid 2564, dwProcessId 696, hProcess 0x104, progname 'c:\cygwin\bin\sleep.exe' For the moment, the machine which has the problem, still runs on cygwin 1.3.20, I am waiting for 1.5 to stabilise before I completely replace all my packages on a production machine. Anybody have a clue ? Could it be that this problem is solved in a later release ? Regards, Jurgen -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/