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Re: Core multithread dangers [message #843 is a reply to message #836]

Sat, 04 February 2006 14:53

hojtsy
Messages: 241
Registered: January 2006
Location: Budapest, Hungary

Experienced Member

luzr wrote on Fri, 03 February 2006 17:51

Also, note that StaticCriticalSection is zero-initilized POD, so it does not perform any further form of initilization (nice simple solution to "how to serialize initialization of serializer").

Yes, that is a very good idea. But I needed almost an hour Shocked

to figure out how that works before you posted it - it was quite tricky. Even a short code comment would have saved me lots of time.

I think this new macro is not threadsafe:

#define ONCELOCK \
for(static volatile bool b = true; b;) \
	for(static CriticalSection section; b;) \
		for(CriticalSection::Lock lock(section); b; b = false)

The problem is that the b flag is not protected from repeated default-initialization to true.

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[Message index]

		Core multithread dangers By: hojtsy on Fri, 03 February 2006 23:09
		Re: Core multithread dangers By: mirek on Fri, 03 February 2006 23:51
		Re: Core multithread dangers By: mirek on Sat, 04 February 2006 12:14
		Re: Core multithread dangers By: hojtsy on Sat, 04 February 2006 14:53
		Re: Core multithread dangers By: mirek on Sat, 04 February 2006 18:20
		Re: Core multithread dangers By: mirek on Mon, 06 February 2006 11:46
		Re: Core multithread dangers By: hojtsy on Mon, 06 February 2006 14:18
		Re: Core multithread dangers By: mirek on Mon, 06 February 2006 14:24
		Re: Core multithread dangers By: hojtsy on Mon, 06 February 2006 14:37
		Re: Core multithread dangers By: mirek on Mon, 06 February 2006 14:52
		Re: Core multithread dangers By: mirek on Mon, 06 February 2006 19:19
		Re: Core multithread dangers By: hojtsy on Tue, 07 February 2006 09:59
		Re: Core multithread dangers By: fudadmin on Tue, 07 February 2006 11:09
		Re: Core multithread dangers By: unodgs on Tue, 07 February 2006 11:41
		Re: Core multithread dangers By: fudadmin on Tue, 07 February 2006 12:49
		Re: Core multithread dangers By: mirek on Tue, 07 February 2006 14:42

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