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Subject:	Re: [ANNOUNCEMENT] Updated: cygutils 1.4.16-7
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From:	Mark Geisert <mark AT maxrnd DOT com>
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Date:	Sun, 26 Sep 2021 02:40:11 -0700
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Hi Takashi,

Takashi Yano via Cygwin wrote:
> Sometimes, putclip shows error
> "Unable to open the clipboard"
> when I run 'echo A | putclip'.
> 
> I digged into this problem, and found OpenClipboard() sometimes
> fails with error ERROR_ACCESS_DENIED if it is called just after
> SetClipboardData() and CloseClipboard().
> 
> Currently, putclip calls OpenClipboard()/CloseClipboard() four
> times. Is there any reason why closing and reopening clipboard
> several times?

I don't know why the author coded putclip that way.  Perhaps Windows required 
different clipboard interfacing long ago?  Or the author was being very cautious?

> Is there any problem if you open clipboard once and close it at
> the end of function int putclip() just like the patch attached?
> 
> The problem above disappears if the patch is applied.

I will implement something similar to your patch for -8 in the next few days. 
Thank you for digging into this issue; I had seen evidence the clipboard was busy 
but wondered why Windows itself couldn't serialize access.  It's amusing to find 
that putclip is apparently interfering with itself :-).
Cheers,

..mark

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