MoveWindow死锁？ [英] MoveWindow deadlock?

问题描述

我在线程A上有一个窗口，该窗口在某个时候（由于在其wndproc上收到消息）触发了对线程B的操作，然后等待该操作完成（使用某种同步机制） ）。然后，线程B调用 MoveWindow（），以在线程A的窗口内移动一个子窗口（例如，标准文本框）。此时，由于某种原因，程序进入了死锁状态。如果从线程A调用 MoveWindow（），则一切正常。知道为什么吗？

I have a window on thread A, which at some point (as a result of a message being received on its wndproc) triggers an action on thread B, and then waits for the action to complete (using some sort of sync mechanism). Thread B then calls MoveWindow(), to move a child window within thread A's window (a standard textbox, for example). At this point the program goes into a state of deadlock for some reason. If MoveWindow() is being called from thread A, everything works. Any ideas why?

推荐答案

您可以使用带有标志SWP_ASYNCWINDOWPOS的SetWindowPos，而不是MoveWindow。

You could use SetWindowPos with the flag SWP_ASYNCWINDOWPOS, instead of MoveWindow.

原因可能是ThreadA等待ThreadB处理某些事件，但同时ThreadB等待ThreadA（拥有窗口的线程）返回MoveWindow的结果。

The reason may be that ThreadA waits for ThreadB to handle some event but meanwhile ThreadB wait for ThreadA (the thread owning the window) to return the result of MoveWindow.

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