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oib111
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 Posted: Sat Dec 29, 2007 1:27 am Post subject: good uses of multi-threading? |
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What are some good uses of multi-threading?
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DoomsDay
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| Posted: Sat Dec 29, 2007 1:35 am Post subject: |
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| It allows you to do more tasks at the same time.
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Dark Byte
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| Posted: Sat Dec 29, 2007 2:00 am Post subject: |
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doing processing in a seperate thread instead of the main thread, allowing a user to start another process at the same time.
also, on multicore cpu's not using multithreading is just wasting at least half of the system's functionality. Put those cores to use.
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oib111
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| Posted: Sat Dec 29, 2007 9:56 am Post subject: |
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I know what multi-threading is. I stated it wrong. I meant like examples of multi-threading in use.
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DoomsDay
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| Posted: Sat Dec 29, 2007 11:00 am Post subject: |
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| Progress-bars are good examples . Also: when you create a form - it's a thread.
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Dark Byte
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| Posted: Sat Dec 29, 2007 12:05 pm Post subject: |
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actually, a form isn't a thread, it's just event based (there's a main thread that handles messages of all windows and dispatches them to the correct functions and that loop can be called from code using application.processmessages)
anyhow, one example of threads is ce 5.4's new memory scanner.
It creates 2 threads on a dualcore and 4 threads on a quadcore, splits up the region to be scanned between the threads and scans them
Same for ce's pointerscanner, each time it goes through a list of results, and then assigns a result to a idle thread or when all threads are already working wait till one is done and give it the new task.
another use of multithreading would be in games. One thread doing physics, the other thread doing audio, one thread for AI, and another thread the rendering (e.g ut3 uses a lot of threading)
And you can also use it for little things, like ce's color changing on the process button. It's a low priority thread that changes the color continuesly.
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oib111
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| Posted: Sat Dec 29, 2007 4:16 pm Post subject: |
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Can someone explain to me a little more of the beginthread API in this code?
| Code: |
#include <stdio.h>
#include <windows.h>
#include <process.h> // needed for _beginthread()
void silly( void * ); // function prototype
int main()
{
// Our program's first thread starts in the main() function.
printf( "Now in the main() function.\n" );
// Let's now create our second thread and ask it to start
// in the silly() function.
_beginthread( silly, 0, (void*)12 );
// From here on there are two separate threads executing
// our one program.
// This main thread can call the silly() function if it wants to.
silly( (void*)-5 );
Sleep( 100 );
}
void silly( void *arg )
{
printf( "The silly() function was passed %d\n", (INT_PTR)arg ) ;
}
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Cx
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oib111
I post too much
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| Posted: Sat Dec 29, 2007 4:31 pm Post subject: |
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| Quote: |
_beginthread( silly, 0, (void*)12 );
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| Quote: |
silly( (void*)-5 );
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It's really the bolded parts I don't get.
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Dark Byte
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| Posted: Sat Dec 29, 2007 7:35 pm Post subject: |
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it converts the value of 12 and -5 to a pointertype so the compiler won't complain, since the prototype of silly expects a pointer instead of a integer
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