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[英]Deadlock in code invoked by Dispatcher.Invoke from multiple threads
[英]synchronize wpf dispatcher.invoke from multiple background threads
如果從多個后台線程訪問,我是否需要同步對Dispatcher.Invoke的調用?
我知道Dispatcher.BeginInvoke自動同步Silverlight應用程序的調用( http://msdn.microsoft.com/zh-cn/library/z8chs7ft(v=vs.95).aspx )
對於wpf應用程序也是如此,還是我應該取消注釋下面的lock語句。
public MainWindow()
{
InitializeComponent();
Dispatcher.BeginInvoke(new Action(() =>
{
const int MAX_NR_THREADS = 1000;
for (int i = 0; i < MAX_NR_THREADS; ++i)
{
int j = i+1;
new Thread(()=>ThreadMethod(j)).Start();
}
}));
}
private void ThreadMethod(int threadId)
{
const int ONE_MILLION = 1000000;
for (int i = 0; i < ONE_MILLION/threadId; ++i)
{
//lock(lockObj)
//{
this.Dispatcher.Invoke(new Action(() =>
{
int sum = 0;
for (int j = 0; j < ONE_MILLION/10000; ++j)
{
sum += j;
}
int a = sum;
concurrentQueue.Enqueue(threadId*ONE_MILLION);
}));
//}
}
}
無需同步這些調用。 Dispatcher.Invoke
有效地充當了您的呼叫的隊列,並且不需要同步。
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