Question

Which of the following is an atomic operation? *
1 point
swap()
test&set()
wait()
None of the options​

Answer 1

Answer:

swap() operation is not fully atomic operation

but it is atomic

Answer 2

An atomic operation is as follows:

• From all of the above, only Test & Set can be called an Atomic operation. Test & Set is a kind of instruction that is used to write 1 set to a particular memory location.
• While writing, it returns the old value as a non-interruptible (also called, Single atomic) operation. CPU can use this instruction. Test & Set instructions can also be applied to Software as well.
• Here, these instructions are used with Boolean values, but the function has to be executed atomically.