如何暂停NSThread直到通知？ [英] How to pause an NSThread until notified?

问题描述

我有一个工作线程，我想做一点任务，然后暂停&等待来自另一个线程的ok，continue命令，然后暂停&等待等等。

I have a worker thread that I want to do one bit of its task, then pause & wait for the "ok, continue" command from another thread, then pause & wait, etc.

用例是：控制对象是一个视图，我想显示工作线程内部的信息，并允许我

The use case is: the controlling object is a view that I want to display information about what's going on inside the worker-thread, and allow me to "single-step" through the worker as it does it's thing.

在我的工人中，我所拥有的相当丑陋和沉重的东西是这样的：

The rather ugly and heavy-handed thing that I have in my worker is this:

NSLog(@"paused");
paused = YES;

while (paused)
{
    [NSThread sleepForTimeInterval:0.25];
}
NSLog(@".. continuing");

...但我不禁想到必须有一个更好的方式，

...But I can't help but think that there must be a nicer way, perhaps involving NSLocks, or some such.

感谢！

b

推荐答案

查看 NSCondition 和条件部分。代码将如下所示：

Look into NSCondition and the Conditions section in the Threading guide. The code will look something like:

NSCondition* condition; // initialize and release this is your app requires.

//Worker thread:
while([NSThread currentThread] isCancelled] == NO)
{
    [condition lock];
    while(partySuppliesAvailable == NO)
    {
        [condition wait];
    }

    // party!

    partySuppliesAvailable = NO;
    [condition unlock];
}

//Main thread:
[condition lock];
// Get party supplies
partySuppliesAvailable = YES;
[condition signal];
[condition unlock];

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