Can you devise a satisfactory substitute for traps using interrupts and/or exceptions?

Can you devise a satisfactory substitute for traps using interrupts and/or exceptions?

Can you devise a satisfactory substitute for traps using interrupts and/or exceptions? If so, explain how. If not, explain why. Yes we can, if we treat trap as a kind of exceptions(actually I think this is what intel x86 implement it – the classes of exceptions are trap, fault and abort).

Is it possible to have an operating system without interrupts?

Without interrupts, a user may have to wait for a given application to have a higher priority over the CPU to be ran. This ensures that the CPU will deal with the process immediately.

What is correct about Trap instructions and interrupts?

A trap is a software-generated interrupt. An interrupt can be used to signal the completion of an I/O to obviate the need for device polling. A trap can be used to call operating system routines or to catch arithmetic errors. Interrupts are hardware interrupts, while traps are software-invoked interrupts.

What is the difference between an exception and an interrupt?

Exceptions and interrupts are unexpected events which will disrupt the normal flow of execution of instruction(that is currently executing by processor). An exception is an unexpected event from within the processor. Interrupt is an unexpected event from outside the process.

Why are interrupts asynchronous?

an interrupt is an asynchronous signal indicating the need for attention or a synchronous event in software indicating the need for a change in execution.

Are exceptions interrupts?

Exception is a software interrupt, which can be identified as a special handler routine. Exception can be identified as an automatically occurring trap. Generally, there are no specific instructions associated with exceptions (traps are generated using a specific instruction).

Which registers are used to disable exceptions?

Disabling interrupts and exceptions In order to be able to do this, we need an additional register that can be used to mask exception and interrupt types. This is called the Status register.

How are computer interrupts handled?

If the request is accepted, the processor responds by suspending its current activities, saving its state, and executing a function called an interrupt handler (or an interrupt service routine, ISR) to deal with the event. Systems that use interrupts in these ways are said to be interrupt-driven.

What is the difference between trap and exception?

A trap is a kind of exceptions, whose main purpose is for debugging (eg. notify the debugger that an instruction has been reached). A software interrupt (aka Programmed Exceptions) occur at the request of the programmer. They are used to implement system calls.

Can traps be generated by a user program?

A trap is a software-generated interrupt. A trap can be generated intentionally by a user program. It can be used to call operating system routines or to catch arithmetic errors.

What is a mode switch operating system?

Mode switch changes the process privileges between user and kernel modes. A mode switch occurs when a process requires accessing a system resource. It happens using the system call interface or by an interrupt. System call allows user mode process to call a kernel function from user mode.

What is a exception?

The term exception is shorthand for the phrase “exceptional event” and can be defined as follows: Definition: An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions.

Can we make an exception?

Exempt someone or something from a general rule or practice, as in Because it’s your birthday, I’ll make an exception and let you stay up as late as you want.

What do I do if my package has a delivery exception?

Here’s what to do if you notice an exception while a package is in transit.

1. Contact the carrier.
2. Contact the customer.
3. Issue a refund or resend the package.

What happens when there is a delivery exception?

An exception occurs when a package is temporarily delayed while in transit. Every effort is made to deliver every package as soon as possible, so an exception does not necessarily denote a late shipment. Such a delivery exception may occur because the package was incorrectly addressed, a recipient was unavailable, etc.

What does delivery exception mean customer not available?

A delivery exception means the package was not delivered but the courier did make an attempt. This can be due to a bad or incomplete address such as when numbers get reversed on the label or the sender forgot to put the unit number on the package.

What does it mean when your package says exception?

An exception occurs when a package or shipment encounters an unforeseen event, which could result in a change to the expected delivery day. Examples of exception include: address unknown, damage to shipment, or signature not received.

What does delivery exception no attempt made mean?

“No attempt made” without any other details means the package never got scanned after being scanned as out for delivery, even after the truck returned empty.

What does exception no access mean?

At the end of the day, when you get this notification it just means that the USPS mail carrier wasn’t able to bring your package to you and that you’re going to have to come up with another solution to get your packages from them.

What does business closed No delivery attempt mean?

Business Closed is a status used for businesses that do not take delivery on that day(s). Delivery is not attempted, no notice is left. The business knows they have a standing order for mail to not be delivered on the day they have specified they are closed.

What does it mean when FedEx says unable to deliver?

The status ‘exception’ means that an unexpected event is preventing delivery of your package. Some examples include: A customs delay. A holiday.

What does unable to deliver mean?

Unable to deliver – The local postal carrier was unable to deliver the package (Note: The reason for non-delivery should be indicated on package when it is returned to the original sender). Successful delivery – The package was successfully delivered to the final recipient.

What if FedEx has wrong address?

DHL’s customer service number is If you are the shipper, you must contact FedEx Customer Service to change the address. You can call them at 1- You will be billed a $12.50 service charge.

Does FedEx intentionally hold packages?

They intentionally hold packages coming in from other countries until Customs, and any other concerned government agencies can do their clearance inspections. If a plane can’t take off due to weather conditions, the packages are intentionally held.

Does FedEx have cameras in their trucks?

We have driver facing cameras in our tractor trailers at express. Because of where most of them are mounted, drivers will flip down the passenger sun visor.

Do FedEx drivers steal packages?

A South Florida FedEx driver has been charged with stealing more than $124,000 worth of items. A South Florida FedEx driver has been charged with stealing more than $124,000 worth of items. “It’s very shocking. This is someone that people believe that they’ve put their trust in to send their packages,” said Sgt.

Does FedEx charge for refused packages?

FedEx shall be entitled to charge an administrative fee for packages rejected and for the costs of returning goods, where applicable, to the Sender.

Who pays refused package?

The original sender does pay for returns if they used ground service. Priority Mail and First Class Mail is returned at no cost. The customer who refuses it does not pay, unless they opened it. Then it becomes new mail.

Can I refuse delivery of a package?

Can you refuse a parcel delivered to you? Yes. You can refuse a parcel which was not addressed to you but it ended up at your location. You can also refuse the shipment that you were expecting if it didn’t arrive in a good condition and has clear signs of damages.

How do you refuse a shipment?

If the mail carrier delivers you the shipment and you want to refuse it at the same time, then simply ask him/her to return that mail back to the sender. If the delivery is made before sometime or some days, then write “Refused” on the mail and put it into the mailbox or you can ask the mail carrier to pick it up.