[bug #28757] [NSThread sleepUntilDate:] in this example uses 100% of a CPU while sleeping on MinGW

[Brock Erwin]

URL:
  <http://savannah.gnu.org/bugs/?28757>

                 Summary: [NSThread sleepUntilDate:] in this example uses
100% of a CPU while sleeping on MinGW
                 Project: GNUstep
            Submitted by: berwin
            Submitted on: Thu 28 Jan 2010 06:32:38 PM GMT
                Category: Base/Foundation
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I compiled the following code on a WindowsXP machine in a MinGW environment. 
When I run the program, I notice that I have 25% CPU usage (I have a QUAD core
machine), so that's 100% of one core.  You would expect it to use near 0% of
the processor since it is sleeping most of the time. I had to tweak the time
variable to notice this behavior, however, and when I set it to time = 10000,
the CPU usage is around 0% as I would expect.

#import <Foundation/Foundation.h>
#include <stdio.h>
#include <Windows.h>
#include <fcntl.h>


int main(int argc, char *argv[], char *env[]) {
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

        NSDate *d;
        NSTimeInterval time;

        //time = 10000; //  a long time
        time = 10; // 10 seconds ?
        while (YES) {
                
                d=[NSDate dateWithTimeIntervalSinceNow: time];
                [NSThread sleepUntilDate:d];

        //      [NSThread sleepForTimeInterval:1];

                printf("one iteration\n");
        }

        [pool release];
}




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