Author: Peter McKenzie
Date: 18:51:41 04/06/99
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On April 06, 1999 at 21:30:34, James Robertson wrote: >I am thinking of making my program multithreaded to ease implementation of >several things. But before I begin, I have several questions: first, if I have >an input thread that just sits with cin, and my search thread is doing stuff in >the background, will the search thread be slowed? Second, about locking and No, it won't be significantly slowed if you are doing blocked input (something like 'cin >> str;'. You'd worry more if you are polling, but you can easily put a call to Sleep into your polling loop. >unlocking resources shared between threads; how is this usually done? If I just >declare a variable, say > >bool locked = false; > >Can I "lock" and "unlock" resources by just: > >.... > >//see if the variable is locked >if (!locked) { one thread might get to here, then have to yield time, meaning that the other thread could get to here too... > locked = true; > //change shared resources > locked = false; >} > >Will this work? most of the time :-) > >Any help is appreciated. For a start, look at the Win32 (assuming your're using windows) documentation on critical sections. cheers, Peter >James > >....
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