Another problem with the polling method used in the previous code fragment is that the BOOL variable g_fFinishedCalculation might never be set to TRUE. This can happen if the primary thread has a higher priority than the thread executing the RecalcFunc function. In this case, the system never assigns any time slices to the RecalcFunc thread, which never executes the statement that sets g_fFinishedCalculation to TRUE. If the thread executing the _tWinMain function is put to sleep instead of polling, it is not scheduled time and the system can schedule time to lower-priority threads, such as the RecalcFunc thread, allowing them to execute.
Another problem with the polling method used in the previous code fragment is that the BOOL variable g_fFinishedCalculation might never be set to TRUE. This can happen if the primary thread has a higher priority than the thread executing the RecalcFunc function.
Another problem with the polling method used in the previous code fragment is that the BOOL variable g_fFinishedCalculation might never be set to TRUE. This can happen if the primary thread has a higher priority than the thread executing the RecalcFunc function.
上面代码段中的问题是变量 xx 可能永远不会赋值成 true, 当主线程比执行 xx 的线程有更高的优先级时就会发生这种情况.