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FIguRE 22-3 How a host application gets its thread back
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Let me now clear up a few loose ends about this architecture . First, Thread s Abort method is asynchronous . When Abort is called, it sets the target thread s AbortRequested flag and returns immediately . When the runtime detects that a thread is to be aborted, the runtime tries to get the thread to a safe place . A thread is in a safe place when the runtime feels that it can stop what the thread is doing without causing disastrous effects . A thread is in a safe
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22 CLR Hosting and AppDomains
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place if it is performing a managed blocking operation such as sleeping or waiting . A thread can be corralled to a safe place by using hijacking (described in 21) . A thread is not in a safe place if it is executing a type s class constructor, code in a catch or finally block, code in a CER, or unmanaged code . Once the thread reaches a safe place, the runtime will detect that the AbortRequested flag is set for the thread . This causes the thread to throw a ThreadAbortException . If this exception is not caught, the exception will be unhandled, all pending finally blocks will execute, and the thread will kill itself gracefully . Unlike all other exceptions, an unhandled ThreadAbortException does not cause the application to terminate . The runtime silently eats this exception and the thread dies, but the application and all of its remaining threads continue to run just fine . In my example, the host catches the ThreadAbortException, allowing the host to regain control of the thread and return it to the pool . But there is a problem: What is to stop the untrusted code from catching the ThreadAbortException itself to keep control of the thread The answer is that the CLR treats the ThreadAbortException in a very special manner . Even when code catches the ThreadAbortException, the CLR doesn t allow the exception to be swallowed . In other words, at the end of the catch block, the CLR automatically rethrows the ThreadAbortException exception . This CLR feature raises another question: If the CLR rethrows the ThreadAbortException at the end of a catch block, how can the host catch it to regain control of the thread Inside the host s catch block, there is a call to Thread s ResetAbort method . Calling this method tells the CLR to stop rethrowing the ThreadAbortException at the end of each catch block . This raises yet another question: What s to stop the untrusted code from catching the ThreadAbortException and calling Thread s ResetAbort method itself to keep control of the thread The answer is that Thread s ResetAbort method requires the caller to have the SecurityPermission with the ControlThread flag set to true . When the host creates the AppDomain for the untrusted code, the host will not grant this permission, and now, the untrusted code cannot keep control of the host s thread . I should point out that there is still a potential hole in this story: While the thread is unwinding from its ThreadAbortException, the untrusted code can execute catch and finally blocks . Inside these blocks, the untrusted code could enter an infinite loop, preventing the host from regaining control of its thread . A host application fixes this problem by setting an escalation policy (discussed earlier) . If an aborting thread doesn t finish in a reasonable amount of time, the CLR can upgrade the thread abort to a rude thread abort, a rude AppDomain unload, disabling of the CLR, or killing of the process . I should also note that the untrusted code could catch the ThreadAbortException and, inside the catch block, throw some other kind of exception . If this other exception is caught, at the end of the catch block, the CLR automatically rethrows the ThreadAbortException .
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