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What is the meaning of "interrupts are asynchronous"

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What is the meaning of "interrupts are asynchronous"
posted Sep 1, 2017 by anonymous

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An interrupt alerts the processor to a high-priority condition requiring the interruption of the current code the processor is executing. ... Unlike the software type (described below), hardware interrupts are asynchronous and can occur in the middle of instruction execution, requiring additional care in programming.

answer Nov 1, 2017 by Manikandan J
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+4 votes

I am getting confused between trap and interrupt. As trap is software driven and interrupt is hardware originated. Every instruction of a program get executed in CPU then how trap and interrupt differs ? A detailed example can help out me. Thanks in advance.

+1 vote

I am maintaining a program in Python 2 and need to send it a Keyboard Interrupt to close it. Unfortunately, the program is used as a subprocess in a wrapper subprocess, and so I cannot just directly press CTL-C; I have to use a signal.
When I run the program "bare" (not in a subprocess), I have found that raising a SIGINT (kill -2) raises a Keyboard Interrupt in the program. But when I run the program in the wrapper process, kill -2 no longer has any effect (whether it is raised by the wrapper or externally).
Why is that the case? Does Pythons interpretation of SIGINT as a Keyboard Interrupt only obtain when the program is run in a terminal? Is there something else Im missing?

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