为了方便起见,我已经使用一些工作代码编辑了上一篇文章。NSMutableArray replaceObjectAtIndex:withObject循环泄漏
后续代码(ARC'ed)似乎泄漏,而且时间很短一段时间的磨合后会崩溃的SIM卡或设备:
#define kROWS 100
#define kCols 34
void run();
static ViewController *instance;
@interface ViewController()
@property (nonatomic, strong) NSMutableArray *nsBackColor;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.nsBackColor = [NSMutableArray arrayWithCapacity:1];
instance = self;
// set up a '2D array'
for (int x = 0; x < kROWS; x++) {
[self.nsBackColor addObject:[NSMutableArray arrayWithCapacity:1]];
for (int y = 0; y < kCols; y++) {
[[self.nsBackColor objectAtIndex:x] addObject:[UIColor whiteColor]];
}
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
run();
});
}
- (void)plotColor:(UIColor *)color atX:(short)x andY:(short)y {
[[self.nsBackColor objectAtIndex:x] replaceObjectAtIndex:y withObject:color];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
void plot(short xLoc, short yLoc,
short backRed, short backGreen, short backBlue) {
@autoreleasepool {
[instance plotColor:[UIColor colorWithRed:((float)backRed/100)
green:((float)backGreen/100)
blue:((float)backBlue/100)
alpha:(float)1]
atX:xLoc andY:yLoc];
}
}
void run() {
short x = 0;
short y = 0;
short backRed = 0;
short backGreen = 0;
short backBlue = 0;
while (true) {
x++;
if (x >= kROWS) {
x = 0;
}
y++;
if (y >= kCols) {
y = 0;
}
backRed = arc4random() % 255;
backBlue = arc4random() % 255;
backGreen = arc4random() % 255;
plot(x, y, backRed, backGreen, backBlue);
usleep(1000);
}
}
如果我让设备或模拟器上运行这个足够长的时间(几分钟)我会收到一个mmap malloc错误(sim)或一个内存警告(设备)并崩溃。
通过仪器分配我可以看到+ [UIColor colorWithRed:green:blue:alpha:]开始气球直到最后敲击记忆墙。
我可以指定UIColor属性(直接或通过复制),说self.myColor =颜色,并没有这样的泄漏。
我也可以这样做:
[[self.nsBackColor objectAtIndex:x] replaceObjectAtIndex:y withObject:[self description]];
,我也得到相同的泄漏。
在我看来,在数组中替换的对象(是的,这最初是作为一个2D C数组开始的,但我认为这是问题)永远丢失并泄漏,没有正确释放。
这将是仪器 - >拨款的短时间运行后:
任何帮助将是非常赞赏,并且可以提供更多的信息。
你看过仪器中的这个确认你对泄漏的怀疑吗? – 2013-02-26 01:30:16
你打赌。新增了一张图片。 – Sandoze 2013-02-26 02:02:35
主runloop何时有机会耗尽自动释放池? 'usleep'是允许的,还是'while(true)'会阻止主runloop清除autorelease池? – 2013-02-26 03:12:26