Re: Thread synchronisation

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#13651

From: Wim Bekker
Date: Thu, 02 Oct 2003 12:01

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"Rob" wrote:

> This is a good technique;  it's one I've used regularly.  One potential
> issue
> to be aware of is ensuring that the worker thread does not access the
> "needed values" while the main thread is using them.  I presume this is
> what you mean by a "thread-safe place" eg the needed values
> are protected by a critical section.  There is a slight performance
> overhead with this (it is just a cost of preventing things like
> race conditions).

I protect the data with a TMultiReadExclusiveWriteSynchronizer. The thread
has to ask write lock so the main-thread can still block the thread. For
best performance I let the main-thread perform a copy (Move) of the data and
then proces it further.

> Your statement about the Synchronize() method needs to be stronger:
> it *will* halt the worker thread until the main thread handled the
request.
> That is the whole purpose of the method.

Yep.

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From: "Wim Bekker" <wim@bekker>
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Subject: Re: Thread synchronisation
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