Comparison of IPC
Pipes
Advantages
1) Simplest from of IPC
2) Can be used in shell
Disadvantages
1) Only for related process
2) No message boundary
FIFO
Disadvantages
- Data cannot be broadcasted to multiple receivers
- If there are multiple receivers there is not way to direct the data to particular user
- Cannot be used across network
- Less secure than pipe, since any process with valid access permission can access them
- Cannot store data
- No message boundaries. Data is treated as stream of bytes
Message Queues
Advantages
1) can broadcast data ????
2) can direct data
3) can store data
4) message boundaries
disadvantage
1) effective for small amount of data
2) very expensive for large data, as transferred through kernel buffer and double coping
3) each data transfer involves 2 data copy operations
4) a message queue cannot be reused, since once the message is taken from the queue , message is removed from message queue.
Shared memory
1) faster method than queues
2) does not require extra kernel buffer
3) safe, manipulated like other variables
Disadvantages
1) data can either read or written only. Append is not possible
2) race condition is possible so locking is required.
Good to read
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