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Date: | Fri, 1 Apr 2005 10:50:12 +0200 |
From: | Corinna Vinschen <corinna-cygwin AT cygwin DOT com> |
To: | cygwin AT cygwin DOT com |
Subject: | Re: 1.5.13:Is it difficult to make cygwin recycle pids when create new process? |
Message-ID: | <20050401085012.GB7415@cygbert.vinschen.de> |
Reply-To: | cygwin AT cygwin DOT com |
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References: | <d2gufc$m8d$1 AT sea DOT gmane DOT org> <20050331140656 DOT GF2495 AT cygbert DOT vinschen DOT de> <000a01c53658$14130560$0201a8c0 AT cttcq> |
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On Apr 1 09:13, Merlin Ran wrote: > > Doesn't http://www.cygwin.com/ml/cygwin/2003-10/msg00169.html explain it? > > > No. I learned why using two pids from the post, but it still doesn't explain > why winpid is always increasing. Since every process is created by > CreateProcess() ultimately, why doesn't it behave alike native windows > process, which reuse the pid of previously exited process? After consult msdn > online, I haven't found any parameters which can affect the selection of new > process's pid. How could cygwin achieve this? Cygwin does nothing and can't do anything to influence the Windows PID chosen by the system. Also I can't reproduce any of your assertions. Windows allocates PIDs using some strategy which I don't quite understand but it certainly doesn't reuse PIDs trying to get a PID of a just exited processes. Actually it seems to me that PID values are nothing else but handle values like every other handle pointing to a system object. I also don't see that Windows PIDs are always increasing under Cygwin. Where did you get this impression from? I've started a couple of shells to get a nice process tree. Look at the Windows PIDs. $ ps -e PID PPID PGID WINPID TTY UID STIME COMMAND 4148 1 4148 4148 ? 18 21:15:28 /usr/bin/cygrunsrv 11032 4148 11032 11540 ? 18 21:15:28 /usr/sbin/sshd 11144 11032 11144 2672 ? 18 10:31:08 /usr/sbin/sshd 9076 11144 9076 8336 0 1003 10:31:09 /usr/bin/tcsh 2888 9076 2888 1408 0 1003 10:31:32 /usr/bin/tcsh 3944 2888 3944 1468 0 1003 10:31:40 /usr/bin/tcsh 11340 3944 11340 10080 0 1003 10:31:44 /usr/bin/tcsh 9088 11340 9088 3092 0 1003 10:32:23 /usr/bin/tcsh 7348 9088 7348 4936 0 1003 10:32:47 /usr/bin/tcsh I 9484 7348 9484 5416 0 1003 10:32:55 /usr/bin/tcsh 9872 11032 9872 10876 ? 18 10:41:43 /usr/sbin/sshd 1112 9872 1112 9924 1 1003 10:41:44 /usr/bin/tcsh 3884 1112 3884 1220 1 1003 10:41:49 /usr/bin/tcsh 2368 3884 2368 10840 1 1003 10:41:50 /usr/bin/tcsh 7056 2368 7056 7548 1 1003 10:41:52 /usr/bin/tcsh 6228 11032 6228 252 ? 18 10:43:25 /usr/sbin/sshd 6836 6228 6836 9512 2 1003 10:43:25 /usr/bin/tcsh 5192 6836 5192 7784 2 1003 10:43:27 /usr/bin/tcsh 11544 5192 11544 2668 2 1003 10:43:29 /usr/bin/tcsh 1640 11544 1640 4496 2 1003 10:43:30 /usr/bin/tcsh I 10348 1640 10348 3956 2 1003 10:43:31 /usr/bin/tcsh 9436 7056 9436 8200 1 1003 10:47:01 /usr/bin/ps Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader mailto:cygwin AT cygwin DOT com Red Hat, Inc. -- 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/
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