The CLR needs to be told when the thread is entering or exiting a critical region so that, should a failure condition occur, the CLR can notify the host appropriately.
当线程进入或退出临界区时需要通知clr,以便在出现故障情况时,CLR能够相应地通知宿主。
When the SPU code finishes or hits a critical error condition, it stops executing and the host process returns from the ioctl call.
当SPU代码执行完成或碰到严重的错误条件时,就会停止执行,宿主进程也会从ioctl调用中返回。
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