Please check this link : https://docs.google.com/viewer?a=v&q=cache:Ofx0iLnVqHEJ:vedyadhara.ignou.ac.in/wiki/images/4/42/Media-B1U3mcs041.pdf+need+for+inter+process+synchronization&hl=en&gl=in&pid=bl&srcid=ADGEESjG3st6o0L-OOhgXh-jluJXvTNl97Yz91UtzjRvwpGduBO7Im93kIT3CfKljP5WYpr-erFysO2nlnA8dTqWrMRcmq7yOcuN6IG9DVsHZNmCOmwFqLfzEApKkIAScxu0Z9q-Mfp2&sig=AHIEtbRfSHbrBojm7IpwdzDaJMWmq_hRZA
