[Bug 30224] New: Piping wine in a shell makes it run slower.

http://bugs.winehq.org/show_bug.cgi?id=30224

Bug #: 30224
           Summary: Piping wine in a shell makes it run slower.
           Product: Wine
           Version: 1.4
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Sometimes, it can be useful to run wine through pipes to catch debug logfiles.
For exemple, we might want to run something like wine 2>&1 | tee -a logfile.log
to get stdout and stderr into a logfile
The problem is that if wine is run like this, it takes 4 seconds to exit. The
problems does not appear to be important, but sometimes (bash scripts, POL,
winetricks for example), we need to run wine several times and we want to log
everything. This problem really slows down the process.

The problem is really simple to reproduce : in a clean wineprefix, run the two
following commands:

time wine wineconsole 2>&1 | cat
 # real  0m4.912s

time wine wineconsole 2>&1 | grep Usage
 # real  0m4.006s

time wine wineconsole 2>&1
 # real  0m0.865s

For the first commands (the slow ones), we can see that wineconsole takes time
to exit without knowing why.

This problem does not appear if stdin and stdout are separated:

time wine wineconsole | cat 
 # real   0m0.836s

time wine wineconsole > >(cat) 2> >(cat)
 # real   0m0.774s