StackOverflow2013

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2013-05-14T08:45:35.473
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2013-05-14T08:58:10.093
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Multithreading does not automagically make your program run faster, and <code>Thread.Join</code> simply waits for the thread to complete. Basically if your main thread cannot continue until the thread has completed, you should not use multithreading. Examples of where multithreading does fit: <ul> <li>when trying to download information from several locations, you can let multiple threads wait for data from one location each</li> <li>when you want to perform a time-consuming task while keeping the user interface responsive</li> </ul> The second example may be the case here, but <code>Thread.Join</code> is a blocking operation: it still stops the user interface from being updated while the thread is working. In that case, you'd have to let the thread inform the main thread of its completion. I don't know on what platform you're working here, but for instance on windows forms, the <code>Form</code> class has an <code>Invoke</code> method which lets you call a method on that form's thread: <pre><code>class TheForm { // the method running in a separate thread void myThread() { // do the time consuming work byte[] myData = ProcessData(); // send data to the main thread Invoke(new Action<byte[]>(ThreadCompleted), myData); } // will be executed in the main thread void ThreadCompleted(byte[] data) { // process the data } } </code></pre> About global variables and multithreading: any thread can access them, but there's no telling which thread accesses them when. If you can, you should avoid letting multiple threads access them, or use a <code>lock</code> mechanism to protect them.
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