プロパティのatomicとnonatomic 再び

昨日セッタしか比べなかったので、今日はゲッタ。

#import <Foundation/Foundation.h>

@interface Test01 : NSObject
@property (nonatomic,retain) id obj;
@end

@interface Test02 : NSObject
@property (retain) id obj;
@end

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

    if(argc<2) return -1;
    int type = atoi(argv[1]);
    Class aClass = NULL;
    switch(type) {
        case 0:
            aClass = [Test01 class];
            break;
        case 1:
            aClass = [Test02 class];
            break;
    }
    if(!aClass) return -1;

    Test01 *test = [[[aClass alloc] init] autorelease];
    test.obj = @"";
    id x[2];

    for(unsigned long i = 0; i < 100000000; i++) {
        x[i%2] = test.obj;
    }

    [pool release];
    return 0;
}

@implementation Test01
@synthesize obj;
@end

@implementation Test02
@synthesize obj;
@end

#nonatomic
MBP:~/tmp/src masaki$ time ./test 0

real	0m1.034s
user	0m1.025s
sys	0m0.006s

#atomic
MBP:~/tmp/src masaki$ time ./test 1

real	0m4.318s
user	0m4.292s
sys	0m0.008s

４倍超！！！
これはでかい！！