If the interrupt simulation status flag is set, return EBUSY.
如果设置了中断模拟状态标志，它就会返回EBUSY。
Set the interrupt simulation status flag to indicate that interrupt simulation is in progress.
设置中断模拟状态标志，通知中断模拟正在运行。
If the restart flag is set to True (the default), then an interrupt to the routine caused from some UNIX signal will cause a restart of the routine.
如果restart标志设置为True(默认设置)，那么在某些UNIX信号造成中断时，会重新启动例程。
If the flag is set it indicates that a fast interrupt was serviced and therefore only the program counter is unstacked.
如果该标志被设置指示快速的中断服务是与因此，只有程序计数器拆散。
If the flag is set it indicates that a fast interrupt was serviced and therefore only the program counter is unstacked.
如果该标志被设置指示快速的中断服务是与因此，只有程序计数器拆散。
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