In the Compare&Swap instruction, why must the instruction execute atomically? Write about: Busy waiting - is undesirable because it’s inefficient Potential starving of a process Deadlock - low priority process and high priority process are stuck
In the Compare&Swap instruction, why must the instruction execute atomically? Write about: Busy waiting - is undesirable because it’s inefficient Potential starving of a process Deadlock - low priority process and high priority process are stuck
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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In the Compare&Swap instruction, why must the instruction execute atomically?
Write about:
Busy waiting - is undesirable because it’s inefficient
Potential starving of a process
Deadlock - low priority process and high priority process are stuck
Compare&Swap:
// critical section based on
// compare_and_swap instruction
Shared variable x=0
while (true)
{
while (compare_and_swap(x, 0, 1) == 1)
// do nothing
// critical section code here
x = 0;
// remaining code…
}
// instruction logic
int compare_and_swap(int *word, int testval, int newval)
{
int oldval;
oldval = *word;
if (oldval == testval)
*word = newval;
return oldval;
}
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