每个标记都是唯一的,它是支付指令的安全句柄。
A token is a unique, secure handle to the Payment Instruction.
它更新状态或触发对一个状态机的动作的唯一方法是通过此句柄调用 SIP servlet 例程。
The only way it can update the status or trigger actions to a state machine is by calling the SIP servlet routines via the handle.
id给出了设备唯一标识,如果一个IR Q上已经没有了注册的设备,这个函数就用于删除处理句柄并禁用IRQ总线。
Given the device identified by dev_id, this function removes the handler and disables the IRQ line if no more devices are registered for that IRQ.
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