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Re: Simple class to handle variables used by different threads [message #45047 is a reply to message #45046]

Mon, 24 August 2015 19:08

Mindtraveller is currently offline

Mindtraveller
Messages: 917
Registered: August 2007
Location: Russia, Moscow rgn.

Experienced Contributor

Of course, making variable 'volatile' actually doesn't guarantee anything when we discuss multithreading issues. It just says to compiler 'please, don't optimize it as it may be changed outside your source code'.

The reason it 'sort of' works under modern x86/x64 systems is that modern CPUs change char/int variable with single CPU instruction which effectively avoids multithreading issues. If your variable is anything but char/int (+int64 under x64) you may have multithreading issues when variable is accessed while being updated in another thread.

You should also notice that under arm/mips systems you may have issues even with int32/int64 depending on particular CPU used.

I guess we have nice solution in U++. There's Atomic type which guarantees no multithreading issues with possible support with native OS/CPU commands. So why should we really duplicate its functionality?

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[Message index]

		Simple class to handle variables used by different threads By: koldo on Fri, 21 August 2015 13:41
		Re: Simple class to handle variables used by different threads By: Klugier on Sat, 22 August 2015 14:00
		Re: Simple class to handle variables used by different threads By: koldo on Sat, 22 August 2015 16:08
		Re: Simple class to handle variables used by different threads By: mirek on Sun, 23 August 2015 20:34
		Re: Simple class to handle variables used by different threads By: koldo on Mon, 24 August 2015 09:05
		Re: Simple class to handle variables used by different threads By: mirek on Mon, 24 August 2015 11:34
		Re: Simple class to handle variables used by different threads By: koldo on Mon, 24 August 2015 15:05
		Re: Simple class to handle variables used by different threads By: Mindtraveller on Mon, 24 August 2015 19:08
		Re: Simple class to handle variables used by different threads By: mirek on Mon, 24 August 2015 19:13
		Re: Simple class to handle variables used by different threads By: koldo on Tue, 25 August 2015 00:13
		Re: Simple class to handle variables used by different threads By: sergeynikitin on Tue, 25 August 2015 00:28
		Re: Simple class to handle variables used by different threads By: mirek on Tue, 25 August 2015 15:44
		Re: Simple class to handle variables used by different threads By: koldo on Tue, 25 August 2015 17:04
		Re: Simple class to handle variables used by different threads By: sergeynikitin on Tue, 25 August 2015 19:27
		Re: Simple class to handle variables used by different threads By: koldo on Tue, 25 August 2015 22:45
		Re: Simple class to handle variables used by different threads By: sergeynikitin on Wed, 26 August 2015 05:01
		Re: Simple class to handle variables used by different threads By: koldo on Wed, 26 August 2015 07:24
		Re: Simple class to handle variables used by different threads By: sergeynikitin on Thu, 27 August 2015 01:37

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