From: "Brian K. White" <brian@aljex.com>
To: <zsh-users@sunsite.dk>
Subject: Re: File locking within zsh?
Date: Thu, 11 May 2006 12:13:03 -0400 [thread overview]
Message-ID: <00b901c67515$d7715690$6500000a@venti> (raw)
In-Reply-To: <lt8xp8sko1.fsf@newsol.starnix.com>
----- Original Message -----
From: "Tim Writer" <tim@starnix.com>
To: "Bart Schaefer" <schaefer@brasslantern.com>
Cc: <zsh-users@sunsite.dk>
Sent: Thursday, May 11, 2006 10:25 AM
Subject: Re: File locking within zsh?
> Bart Schaefer <schaefer@brasslantern.com> writes:
>
>> On May 10, 6:04pm, Tim Writer wrote:
>> }
>> } IIRC, zsh avoids forking in subshells but don't most
>> } shells implement subshells with fork()?
>>
>> Zsh forks for subshells, too. It may avoid an *additional* fork when
>> the only thing the subshell does is execute an external command, but
>> it always forks at least once.
>
> Okay. But I don't understand this:
>
> tim@ganesh% echo $ZSH_VERSION
> 4.2.5
> tim@ganesh% echo $$; ( echo $$ )
> 18095
> 18095
> tim@ganesh%
Without special measures, wouldn't both $$ be expanded at the same time
before the line is executed, before the subshell is forked?
However, I avoid all possible globbing issues and still get your result:
set |(cat;set) |less
'$'=6511
PPID=6474
'$'=6511
PPID=6474
Brian K. White -- brian@aljex.com -- http://www.aljex.com/bkw/
+++++[>+++[>+++++>+++++++<<-]<-]>>+.>.+++++.+++++++.-.[>+<---]>++.
filePro BBx Linux SCO FreeBSD #callahans Satriani Filk!
next prev parent reply other threads:[~2006-05-11 16:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-09 22:04 Lloyd Zusman
2006-05-10 3:31 ` Tim Writer
2006-05-10 5:59 ` Brian K. White
2006-05-10 10:02 ` Lloyd Zusman
2006-05-10 22:04 ` Tim Writer
2006-05-11 3:41 ` Bart Schaefer
2006-05-11 14:25 ` Tim Writer
2006-05-11 15:01 ` Peter Stephenson
2006-05-12 4:22 ` Tim Writer
2006-05-12 9:17 ` Subshells and parameters (was: File locking within zsh?) Vincent Lefevre
2006-05-12 12:09 ` Subshells and parameters Lloyd Zusman
2006-05-12 23:09 ` Vincent Lefevre
2006-05-13 2:05 ` Lloyd Zusman
2006-05-17 14:24 ` Vincent Lefevre
2006-05-17 15:42 ` Bart Schaefer
2006-05-17 16:07 ` Vincent Lefevre
2006-05-13 2:10 ` Dan Nelson
2006-05-11 16:13 ` Brian K. White [this message]
2006-05-10 17:13 ` File locking within zsh? Vincent Lefevre
2006-05-11 15:45 ` Brian K. White
2006-05-12 7:54 ` Vincent Lefevre
2006-05-12 19:40 ` Tim Writer
2006-05-12 23:24 ` Vincent Lefevre
2006-05-10 21:53 ` Tim Writer
2006-05-10 6:29 ` DervishD
2006-05-10 10:02 ` Lloyd Zusman
2006-05-10 21:21 ` DervishD
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