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Re: Use same variable in different threads [message #30135 is a reply to message #30134]

Fri, 10 December 2010 14:34

gprentice
Messages: 260
Registered: November 2005
Location: New Zealand

Experienced Member

Actually, on second thoughts I think the code as written is fine without volatile because the mutex forces the shared data to be updated in memory. Possibly an atomic variable that is read or written outside of a mutex region is more likely to need volatile.

Edit : except that doesn't ensure the hardware doesn't use a cached value ... so now I just noticed AtomicRead and AtomicWrite in U++ - so I take it all back - you probably don't need volatile at all Smile

Graeme

[Updated on: Fri, 10 December 2010 14:40]

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[Message index]

		Use same variable in different threads By: koldo on Thu, 09 December 2010 18:26
		Re: Use same variable in different threads By: dolik.rce on Thu, 09 December 2010 18:57
		Re: Use same variable in different threads By: koldo on Thu, 09 December 2010 22:04
		Re: Use same variable in different threads By: Didier on Fri, 10 December 2010 00:26
		Re: Use same variable in different threads By: dolik.rce on Fri, 10 December 2010 06:49
		Re: Use same variable in different threads By: koldo on Fri, 10 December 2010 10:01
		Re: Use same variable in different threads By: dolik.rce on Fri, 10 December 2010 11:34
		Re: Use same variable in different threads By: koldo on Fri, 10 December 2010 13:19
		Re: Use same variable in different threads By: gprentice on Fri, 10 December 2010 14:08
		Re: Use same variable in different threads By: dolik.rce on Fri, 10 December 2010 14:16
		Re: Use same variable in different threads By: gprentice on Fri, 10 December 2010 14:34
		Re: Use same variable in different threads By: Didier on Fri, 10 December 2010 18:50
		Re: Use same variable in different threads By: gprentice on Sat, 11 December 2010 01:37
		Re: Use same variable in different threads By: Didier on Sat, 11 December 2010 23:13
		Re: Use same variable in different threads By: gprentice on Sun, 12 December 2010 01:57
		Re: Use same variable in different threads By: mirek on Sun, 12 December 2010 09:43
		Re: Use same variable in different threads By: koldo on Sun, 12 December 2010 23:16
		Re: Use same variable in different threads By: tojocky on Mon, 13 December 2010 11:35
		Re: Use same variable in different threads By: gprentice on Mon, 13 December 2010 11:46
		Re: Use same variable in different threads By: Didier on Mon, 13 December 2010 22:48
		Re: Use same variable in different threads By: koldo on Tue, 14 December 2010 09:02
		Re: Use same variable in different threads By: mirek on Sat, 25 December 2010 20:45
		Re: Use same variable in different threads By: tojocky on Sun, 02 January 2011 15:35
		Re: Use same variable in different threads By: mirek on Sun, 02 January 2011 18:38
		Re: Use same variable in different threads By: koldo on Sun, 02 January 2011 19:06
		Re: Use same variable in different threads By: mirek on Sun, 02 January 2011 22:56
		Re: Use same variable in different threads By: koldo on Mon, 03 January 2011 09:17
		Re: Use same variable in different threads By: koldo on Sun, 02 January 2011 01:12
		Re: Use same variable in different threads By: gprentice on Sun, 02 January 2011 03:08
		Re: Use same variable in different threads By: Didier on Sun, 02 January 2011 12:18
		Re: Use same variable in different threads By: gprentice on Sun, 02 January 2011 13:11

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