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G. Plante
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 Posted: Fri Jan 06, 2006 5:57 am Post subject: Accessing a database from a thread VS Hyper-Threading on Win |
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Hi,
I have a Delphi 7 program that access a database using the dbexpress
Interbase driver. The main program has a SQL Connection to the database. I
also have a thread that run in background and this thread has its own SQL
connection to access the same database. This thread access the database
every 5 seconds and only read some generators to see if changes were made to
the database.
This program always worked fine on a lot of pcs with Windows XP no matter if
Hyper-Threading is ON or OFF.
However, I got a new pc some days ago (with XP French installed on it). My
program stop working on this pc if Hyper-Threading is turned ON. If I turn
Hyper-Threading OFF on that pc, everything work fine. There is no error
message displayed on screen. It's like the thread stop or wait for
something.
If I modify the program and don't start the thread in background, my program
work fine on that pc even if Hyper-Threading is turned ON. Problems begin
when the thread in background is running.
What could be the problem ?
Thanks!
--
G. Plante
[email]gplante (AT) videotron (DOT) qc.ca[/email]
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Craig Stuntz [TeamB]
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| Posted: Fri Jan 06, 2006 12:23 pm Post subject: Re: Accessing a database from a thread VS Hyper-Threading on |
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G. Plante wrote:
| Quote: | If I modify the program and don't start the thread in background, my
program work fine on that pc even if Hyper-Threading is turned ON.
Problems begin when the thread in background is running.
What could be the problem ?
|
Probably you have a bug in your thread where it incorrectly shares
data with another thread. Multi-threading bugs are much, much, *much*
more likely to surface with multiple CPUs, and this includes
hyper-threaded single processors.
There's not enough info in your post to speculate what the problem
might be, but make sure you're not sharing *anything* between the main
thread and the background thread and that the background connection is
never connected to a visual component in any way.
--
Craig Stuntz [TeamB] . Vertex Systems Corp. . Columbus, OH
Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz
Useful articles about InterBase development:
http://blogs.teamb.com/craigstuntz/category/21.aspx
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