Proposed patch to system.XWinrc

[Christopher Faylor]

On Tue, Jun 23, 2009 at 09:19:05PM +0100, Andy Koppe wrote:
>2009/6/23 Jon TURNEY:
>> Always assuming that /bin/bash exists, or that /bin/sh is bash is probably
>> bad style for portability across unicies.
>>
>> However, in this specific case, it's probably ok.
>
>You never know. If posix_spawn() ever gets implemented in Cygwin to
>avoid the slowness of fork(), /bin/sh might well change to the first
>shell that supports it.

It's really somewhat of an urban myth about Cygwin's fork being slow.
Cygwin's exec is also pretty slow.  I'm not really sure that posix_spawn
would cause any kind of performance improvement.

/bin/sh used to have a local hack which used "vfork" instead of "fork"
back when I thought I could implement vfork in a lightweight fashion.
However, /bin/sh wasn't really noticeably faster using that mechanism.

cgf

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