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Multi-threading

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How can I tell if a thread is still running or not? I'm creadting my threads with the code below. The problem is once Ive started the shutdown (the main thread sets a global bool to false, the other threads just check it at certain points) I don't want the main thread to exit until after the other ones have finished. eg saving data, sending server shutdown messages to connect clients, etc.
	//create gui thread
	unsigned int GuiId;
	uintptr_t GuiThread = _beginthreadex(
		NULL,
		0,
		GuiMain,
		(void*)hInstance,
		0,
		&GuiId);
	unsigned int NetId;
	//create net thread
	uintptr_t NetThread = _beginthreadex(
		NULL,
		0,
		NetMain,
		NULL,
		0,
		&NetId);

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What you want is called a join. Most threading libraries will support this synchronization operation afaik. I would recommend looking into Boost.Threads for easy cross platform threaded development.

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The thread handle can act as an event object. After you have set the global variable telling the thread to shutdown, call WaitForSingleObject(threadHandle, INFINITE);

There's a sample in msdn:
http://msdn2.microsoft.com/en-us/library/kdzttdcb(VS.71).aspx

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