我正在使用iPhone SDK 3.1.2,以下代码显示NSOperationQueue不会为每个任务重用线程。
在Snow Leopard上,此代码没有任何问题。
输出结果显示它创建了100个线程来执行100个任务。
在Snow Leopard上,此代码没有任何问题。
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[queue setMaxConcurrentOperationCount:1];
for(int i = 0; i < 100; i++) {
NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run) object:nil];
[queue addOperation:op];
[op release];
}
}
- (void)run {
static int tc = 0;
if([[NSThread currentThread] isMainThread]) {
NSLog(@"MAIN THREAD");
return;
} else if([[NSThread currentThread] name] == nil) {
[[NSThread currentThread] setName:[NSString stringWithFormat:@"THREAD_%d", tc++]];
}
NSLog(@"%@", [[NSThread currentThread] name]);
}
输出结果显示它创建了100个线程来执行100个任务。
2010-01-07 11:46:03.502 OperationQueueTest[7911:4503] THREAD_0
2010-01-07 11:46:03.506 OperationQueueTest[7911:4d03] THREAD_1
2010-01-07 11:46:03.507 OperationQueueTest[7911:4807] THREAD_2
2010-01-07 11:46:03.510 OperationQueueTest[7911:4d07] THREAD_3
2010-01-07 11:46:03.514 OperationQueueTest[7911:5007] THREAD_4
2010-01-07 11:46:03.516 OperationQueueTest[7911:4f0b] THREAD_5
2010-01-07 11:46:03.518 OperationQueueTest[7911:4e0f] THREAD_6
...
2010-01-07 11:46:03.740 OperationQueueTest[7911:4ea7] THREAD_97
2010-01-07 11:46:03.744 OperationQueueTest[7911:4dcf] THREAD_98
2010-01-07 11:46:03.746 OperationQueueTest[7911:460f] THREAD_99