Im pretty much a beginner when it comes to threads. However, from what i
understand, ThreadList's lock & unlock method prevent multiple write's to a
list automatically. You will still have problems if you havnt locked the
list while one thread is reading its contents, and the other thread is
updating. Lots of delphi thread code that ive seen fix this by always
locking a ThreadList before a read, but this seems ineffecient.
In the ISAPI DLL i wrote, i used TMultiReadExclusiveWriteSynchronizer's to
control all acess to shared resources. It lets multiple threads read an
object/list as long as nothing is updating it. This worked pretty well,
though i probably went overkill on all the locks.
Wilfred.
-----Original Message-----
From: Colin Fraser [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 23, 2001 12:20 PM
To: Multiple recipients of list delphi
Subject: [DUG]: ISAPI and Thread Safeness
Hi all...
I am quite new to ISAPI apps and haven't really done much with treads
either...
How careful do I need to be in regards to ISAPI apps and treads...
For example, if I want to use lots of code that currently uses TLists... do
I need to change them all to TThreadLists.
In actual fact, most of the TLists are in other objects, I have my own type
of list object that uses a TList in behind the scenes... should I change
those to TThreadLists, or create my own Critical Sections around the
important parts??
Is there any performance hit for using TThreadLists instead of TLists, or
Critical Sections for that matter??
Any info appreciated
Regards
Colin
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