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  1. By Jonas Stein on Jun. 30, 2008

    A POSIX signal is used to notify the kernel that a program wishes to interact with it, or for the kernel to send a message to a program, letting it know to stop, resume processing or a number of other different things.


    A hardware interrupt is used solely by the hardware in the computer to get the attention of the processor. This usually happens when a device is reaching a full buffer and needs to transfer that information somewhere so that it can clear the buffer for further use.


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