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Some doubts about Mutex

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Hi,
I've just started to study parallel programming on Linux and I've 
already some doubts about Mutex.

I've a generic data, which I want to access with mutually exclusion 
(1read or 1read).

data

Then I've read/write method:
read_data(...), write_data(...)

Then I've other two method like:

operation_1(...)
{
	...
	operation_2(...)
	...
}

operation_2(...)
{
	...
	read_data(...)		//[1]
	...
	write_data(...)		//[2]
	...
}


Initially I had put between mutex only the read_data and write_data 
methods, then I've realized that this way can bring some trouble because 
if some process/thread call operation_2, some other process/thread can 
call write_data between [1] and [2] screwing up all.

Which is the better way to solve this situation?

Thanks
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Some doubts about Mutex Willy <gruppi@willygroup.org> - 2012-02-21 16:52 +0100
  Re: Some doubts about Mutex Paavo Helde <myfirstname@osa.pri.ee> - 2012-02-21 23:58 -0600

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