Mutual exclusion doubt

Question

How spooling can help in preventing mutual exclusion?

Answer 1

spooling is a temporary buffer area so non sharable device like printer ,os do use a spooling area to print data through printer instead of direct printing so by using spooling we removed mutual exclusion involving printer

Comments

But then again only one program(process) can print at a time. So mutual exclusion is still present??

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Actually mutual exclusion is not a practical solution of deadlock prevention
There's only one practical solution to remove circular wait by arranging the request made by processes in increasing order