[Tcl-bugs] [ tcl-Bugs-219255 ] Closing a pipe to a busy process blocks even when -blocking

[<no...@so...>]

Bugs item #219255, was opened at 2000-10-25 22:04
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Category: 26. Channel Types
Group: = 8.3.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: Andreas Kupries (andreas_kupries)
Summary: Closing a pipe to a busy process blocks even when -blocking 

Initial Comment:
OriginalBugID: 5924 Bug
Version: 8.3.1
SubmitDate: '2000-06-20'
LastModified: '2000-09-11'
Severity: CRIT
Status: Assigned
Submitter: lfb
ChangedBy: davidg
RelatedBugIDs: 710
OS: Windows NT
FixedDate: '2000-10-25'
ClosedDate: '2000-10-25'


Closing a pipe to a busy process blocks on Windows even after you have turned blocking off on the channel.

Try running this script in a tclsh on Windows:
set pipe [open "| tclsh.exe doforever.tcl" r+]
fconfigure $pipe -blocking 0
close $pipe

Contents of doforever.tcl:
while {1} {}

Expected Result:
The primary process closes the pipe and does not block.

Actual Result:
The primary process blocks.



We discovered this problem in the Ajuba2 Server process pool.  If we try to close the pipe to a busy interpreter, the server blocks.
--

A related bug was fixed on the Unix side, but the Windows side uses
a different sort of closedown functions.  Has to be further investigated. 
-- 09/06/2000 hobbs



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>Comment By: Andreas Kupries (andreas_kupries)
Date: 2001-09-07 16:40

Message:
Logged In: YES 
user_id=75003

Rather bug #219252 after renumbering tango.

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Comment By: Donal K. Fellows (dkf)
Date: 2001-01-09 07:20

Message:
See also Bug #119252

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