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Re: Core multithread dangers [message #868 is a reply to message #845]

Mon, 06 February 2006 11:46

mirek
Messages: 14267
Registered: November 2005

Ultimate Member

Hojtsy, I have one MT trouble I would like to share....

It is about Ptr implementation. While current version is MT safe to my knowledge, it is inferior to previous one as it allocates shared data for the lifetime of Pte target.

Original version was able to delete shared data whenever no more pointer were pointing to it, something like

release prec:
if(--prec->n == 0) {
// MT!
prec->ptr->prec = NULL;
delete prec;
}

However, I do not see a way how to implement it without adding a lock to Pte, which is even worse. The trouble is that at the MT! point, Pte can be destructed and prec is not valid anymore....

(Just for record, ~Pte() { if(prec) prec->ptr = NULL; })

Hm, thinking about it, maybe single _global_ lock would do?

Mirek

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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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