c# - 等待锁被释放

Question

我有一个线程。在某个时候，我想做的就是检查某个锁是否可用。如果它是免费的，我希望线程继续其愉快的方式。如果它不是免费的，我想等到它免费后才真正获得锁。

到目前为止，这是我的代码:

private object LockObject = new Object();

async void SlowMethod() {
  lock (LockObject) {
    // lotsa stuff
  }
}

void AppStartup() {
  this.SlowMethod();
  UIThreadStartupStuff();
  // now, I want to wait on the lock.  I don't know where/how the results
  // of SlowMethod might be needed.  But I do know that they will be needed.
  // And I don't want to check the lock every time.
}

Answer 1

我认为您有经典的XY问题。我想您想要的是用SlowMethod启动一个Task，然后用uit_code is UI thread继续执行。

Task.Factory.StartNew(()=>SlowMethod())
     .ContinueWith(t=>UIThreadStartupStuff(), TaskScheduler.FromCurrentSynchronizationContext());

或使用async/await(使您的 UIThreadStartupStuff返回Task)

try
{
   await SlowMethod();
}
catch(...)
{}
UIThreadStartupStuff();