What is a clock interrupt?

Clock interrupts (a.k.a. timer interrupts) occur on the order of every millisecond (typically configurable by the OS) and are used to support preemptive multitasking. Being invoked periodically, the OS can decide to allow the current task to continue running or schedule another task.

Why would a thread ever voluntarily give up the CPU?

Answer: A thread will voluntarily give up the CPU by calling thread yield because of the following reasons: Thread in a process cooperate with each other and if a yielding is needed for the betterment of the application, then the thread will yield for sure.

What is the biggest disadvantage of implementing threads in user space?

What is the biggest advantage of implementing threads in user space? No traps to the kernel are needed to switch threads. The ability of having their own scheduler can also be an important advantage for certain applications. The biggest disadvantage is that if one thread blocks, the entire process blocks.

Which is a advantage of implementing threads in the kernel?

What is the biggest advantage of implementing threads in user space? More efficient. The biggest advantage is that context switching between threads is faster because it does not require a trap into the kernel.

What is the use of interrupt and clock in microcontroller?

For example, an interrupt occurs when a down counting timer reaches 0 and reloads the modulus in the main counter. The timer sends a hardware signal to an “interrupt controller” which suspends execution of the main program and makes the processor jump to a software function called an “interrupt service routine” or ISR.

What are the functions of clock interrupt handler?

When the timer expires, the clock triggers an interrupt, switching to kernel mode in the processor layer. The clock interrupt handler can then invoke an exception handler, which runs in the thread layer and forces the currently running thread to yield.

How many requests sec can the server handle if it is single threaded if it is multithreaded?

Therefore, a single thread can handle 22.73 requests per second. Multi-threaded: The question does not give much detail about the multi-threaded state, apart from the context switch cost.

Are there any problem with implementing threads in user space?

Poor scheduling, like allocating a process with an idle thread or block a process, because a thread is holding a lock. Performance might be inconsistent.

How interrupt works in a microcontroller?

When an interrupt occurs, the microcontroller runs the interrupt service routine. For every interrupt, there is a fixed location in memory that holds the address of its interrupt service routine, ISR. The table of memory locations set aside to hold the addresses of ISRs is called as the Interrupt Vector Table.

Why do microcontrollers need clocks?

In order to control the flow of data between the different building blocks of the microcontrller one needs a clock. So, the clock is needed to manage the operation of the microcontroller. The clock is needed also for the streaming the data across the communication ports.