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Re: patch to support output synchronization under -j

From: Paul Smith
Subject: Re: patch to support output synchronization under -j
Date: Thu, 14 Apr 2011 16:18:51 -0400

On Thu, 2011-04-14 at 20:59 +0100, Tim Murphy wrote:
> To prevent any kind of deadlock you sort of want to empty everything
> the stderr and stdout pipe buffers may contain.
> It is conceivable that the stdout pipe might contain two lines of text
> and stderr pipe might contain 1 by the time your select statement (or
> waitformultipleobjects) has woken up.

This would all be true, if anyone were using pipes and select
statements... but we're not :-)

The implementation David provided has all the output going to temporary
files, which are then read and printed to stdout or stderr (and deleted)
when the job gets the output sync lock.

To choose between merged and not merged you just choose between creating
distinct files, vs. creating one file and setting both stdout/stderr to
write to it... same as it would write to the tty device.

 Paul D. Smith <address@hidden>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.mad-scientist.net
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

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