Author: James Robertson
Date: 22:52:06 04/06/99
Go up one level in this thread
On April 06, 1999 at 21:51:41, Peter McKenzie wrote:
>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.
Just out of curiosity, how would one port WIn32 stuff to, say, Unix or some
other system?
James
>
>cheers,
>Peter
>
>>James
>>
>>....
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