Objective C - NSthread 和 NSthread NSAutoreleasePool？

发布于 2024-09-29 10:48:00 字数 268 浏览 8 评论 0原文

编写线程安全方法的最佳方法是什么？

我有以下方法，有时我想异步调用它（通过线程调用它）有时我想直接在主线程上调用它。即使我没有在单独的线程上调用该方法，保留池（分配、释放）是否存在问题？

- (void)doStuff
{
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
     //do some stuff here?
     [pool release];
}

原文

What is the best way to write a thread safe method?

I have the following method, sometimes i want to call it asynchronously (call it through a thread)
And sometimes i want to call it directly on the main thread.
Is there a problem with keeping the pool (alloc, release) even if I am not calling the method on a separate thread?

- (void)doStuff
{
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
     //do some stuff here?
     [pool release];
}

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轮廓§ 2024-10-06 10:48:00

在主线程上调用是完全安全的。 NSAutoreleasePool 维护一个堆栈，因此在这种情况下，您只需将一个新池放在堆栈顶部，然后在完成后将其弹出。

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慕烟庭风 2024-10-06 10:48:00

不，始终使用您自己的方法本地池没有问题。不过，您应该使用[pool排出]而不是[poolrelease]。

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绝影如岚 2024-10-06 10:48:00

不管这对发布池意味着什么，我都不建议这样写。如果您绝对必须能够从主线程和其他线程调用该方法，请按如下方式编码：

- (void) doSomething {
}

- (void) doSomethingInBackground {
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
    [self doSomething];
    [pool release]
}

这样您就可以将该方法包装在负责释放池的方法中。

Regardless of what it would mean for the release pool, I would not recommend writing it this way. If you absolutely have to be able to call the method from the main and from other threads, code it like this:

- (void) doSomething {
}

- (void) doSomethingInBackground {
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
    [self doSomething];
    [pool release]
}

This way you wrap the method in a method that takes care of the release pool.

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囍孤女 2024-10-06 10:48:00

我也更喜欢 Ivo Jansch 提到的方法。创建/排出池是有效的，但是当您递归或多次调用方法 doStuff: 时可能会有点头痛。但通过遵循 Ivo 的方法，你可以做一些事情而不会出现记忆问题。
而且，为了使方法是线程安全的，您必须在需要时使用锁或@synchronized()，通常是在访问数组/缓冲区/字典时。你的方法应该是这样的

- (void)doStuff{
 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];

 @synchronized(lock) 
 {
    NSLog(@"Hello World");
 }
 [pool release];}

I will also prefer the method mentioned by Ivo Jansch. Creating/draining a pool is valid but it may be a bit headache when you call the method doStuff: recursively or many times. But by following Ivo's method you can do stuff without a memory headache.
And also for a method to be thread safe you must use locks or @synchronized() whenever its needed, usually when accessing a array/buffer/dictionary. Your method should be something like this

- (void)doStuff{
 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];

 @synchronized(lock) 
 {
    NSLog(@"Hello World");
 }
 [pool release];}

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