MY OS Notes

Process Synchronisation

IPC - Inter process communication

• File in mem -> Pipes
• Shared mem for communications

Inter -> comm betn two entity
Intra -> comm withing same entity (func calls)

Problems due to lack of synchronisation

1. Inconsistency (incorrectness)
2. Loss of Data
3. Deadlock

Type of synchronisation

1. Competition: Two process compete for accessing a shared resource
   • Leads to deadlock and incosistency
2. Cooperation : Execution of one task effects the other .eg producer consumer problem

Necessary condition for synchronisation Problem

1. Critical section : accessing shared resource
2. Race Condition : concurrent access of processes to a critical section
   • Final result of output depends on the order in which they finish their update.
3. Preemption : A task can be preemted by other.