12-09-2014, 02:59 PM
signal
A signal is a software interrupt delivered to a process. The operating system uses signals to report exceptional situations to an executing program. Some signals report errors such as references to invalid memory addresses; others report asynchronous events, such as disconnection of a phone line.
Interrupt and Trap
There are two hinderances to a process. Interrupt and trap.
Interrupt is when the process needs some I/O services whereas trap occurs due to some fault or exception in the code.
trap
A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code.
A signal is a software interrupt delivered to a process. The operating system uses signals to report exceptional situations to an executing program. Some signals report errors such as references to invalid memory addresses; others report asynchronous events, such as disconnection of a phone line.
Interrupt and Trap
There are two hinderances to a process. Interrupt and trap.
Interrupt is when the process needs some I/O services whereas trap occurs due to some fault or exception in the code.
trap
A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code.
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