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digitalmars.D - Running test suites under Windows 7

reply Walter Bright <newshound2 digitalmars.com> writes:
When I first installed Win7, I was having problems with erratic failures to 
write executable files while running the D test suite. Eventually, I discovered 
that Windows Defender was the problem, as it tried to do a virus can on every 
exe the test suite produced.

Turning off WD helped a lot, but I still got those failures every once in a
while.

I have since discovered that "Microsoft Security Essentials" was doing a "real 
time scan", mucking things up. That has to be turned off, too.
Oct 05 2012
parent reply =?UTF-8?B?U8O2bmtlIEx1ZHdpZw==?= <sludwig outerproduct.org> writes:
Am 10/6/2012 8:41 AM, schrieb Walter Bright:

 When I first installed Win7, I was having problems with erratic failures
 to write executable files while running the D test suite. Eventually, I
 discovered that Windows Defender was the problem, as it tried to do a
 virus can on every exe the test suite produced.
 
 Turning off WD helped a lot, but I still got those failures every once
 in a while.
 
 I have since discovered that "Microsoft Security Essentials" was doing a
 "real time scan", mucking things up. That has to be turned off, too.


Jep, it's definitely not easy to get this reliable on Windows. Back when
I had a similar problem, an explorer window displaying the same folder
also caused this.
Oct 06 2012
parent reply "Paulo Pinto" <pjmlp progtools.org> writes:
On Saturday, 6 October 2012 at 07:33:51 UTC, Sönke Ludwig wrote:

 Am 10/6/2012 8:41 AM, schrieb Walter Bright:

 When I first installed Win7, I was having problems with 
 erratic failures
 to write executable files while running the D test suite. 
 Eventually, I
 discovered that Windows Defender was the problem, as it tried 
 to do a
 virus can on every exe the test suite produced.
 
 Turning off WD helped a lot, but I still got those failures 
 every once
 in a while.
 
 I have since discovered that "Microsoft Security Essentials" 
 was doing a
 "real time scan", mucking things up. That has to be turned 
 off, too.


 Jep, it's definitely not easy to get this reliable on Windows. 
 Back when
 I had a similar problem, an explorer window displaying the same 
 folder
 also caused this.


This happens, because contrary to UNIX based systems, Windows has 
real locks.

On one side, it is good as the operating system real enforces 
them. On the other hand it can lead to such scenarios if the 
applications are not properly coded to work with file locking 
mechanisms.

UNIX systems on the other hand, still have the cooperating locks 
of the old days, meaning if my application doesn't give a damn 
about locks, it still can manipulate the file. Which might have 
some nasty consequences.

Does any other operating system makes use of cooperative locks?

--
Paulo
Oct 06 2012
parent reply Walter Bright <newshound2 digitalmars.com> writes:
On 10/6/2012 2:25 AM, Paulo Pinto wrote:

 On the other
 hand it can lead to such scenarios if the applications are not properly coded
to
 work with file locking mechanisms.


Both Optlink and Windows link fail with this :-)

(The error code Optlink gets from Windows when it tries to create the EXE file 
is something along the lines of the EXE file is in use by another application.)
Oct 06 2012
parent "Regan Heath" <regan netmail.co.nz> writes:
On Sat, 06 Oct 2012 13:05:32 +0100, Walter Bright  
<newshound2 digitalmars.com> wrote:


 On 10/6/2012 2:25 AM, Paulo Pinto wrote:

 On the other
 hand it can lead to such scenarios if the applications are not properly  
 coded to
 work with file locking mechanisms.


 Both Optlink and Windows link fail with this :-)

 (The error code Optlink gets from Windows when it tries to create the  
 EXE file is something along the lines of the EXE file is in use by  
 another application.)


It's odd that these fail because many/most virus scanners are written  
using file system filter drivers which operate in the IO stack, blocking  
CreateFile/open to scan the file, meaning most user processes don't even  
notice them (except for a very brief pause on CreateFile/open).

R

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Oct 08 2012