Not only does the below code need to use -[NSAutoreleasePool drain]
rather than -release, but it also doesn’t start the background
collection thread.
The first thing it should do in main() is invoke
objc_startCollectorThread() (from <objc/objc-auto.h>) which will
ensure GC is happening asynchronously, rather than only when the
autorelease pool is drained.
— Chris
On Aug 7, 2009, at 2:06 PM, Tim Murison wrote:
#import <Cocoa/Cocoa.h>
#include <libkern/OSAtomic.h>
volatile int64_t globalCounter;
@interface Operation : NSOperation
+ (Operation*) operation;
@end
@implementation Operation
+ (Operation*) operation
{
return [[[Operation alloc] init] autorelease];
}
- (void) main
{
OSAtomicIncrement64(&globalCounter);
}
@end
int main(int argc, char **argv)
{
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
int64_t last, tmp;
last = tmp = 0;
[queue setMaxConcurrentOperationCount:4];
while (1) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]
init];
int64_t tmp;
[queue addOperation:[Operation operation]];
tmp = globalCounter;
if (tmp - last > 1000) {
last = tmp;
printf("Queue length:%d\n", [[queue operations]
count]);
usleep(1000 * 1000);
}
[pool release];
}
}
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