Inter Process Communication

✅ Inter Process Communication

communication among processes
💡 process have independent memory, is run independently
use semaphore, mutext(only one process for shared data)

✅ Types of Inter Process Communication

• pipe
• socket
• file

1. Anonymous PIPE

• one way communication
  
• PIPE can conenct two processes
  
• one process: only write, other process: only read
  
• used for when you know the other communicating process(like parent and child process communication)
  
• 👍🏻 simple to use
  
• 👎🏻 if both ways communication is needed, two PIPEs are required
  

2. Named PIPE

• when you don’t know the other process to communicate
  > one way communication
  

3. Message Queue

• Queue: unlike pipe, is memory
  
• several process can use numbered data
  

4. Shared Memory

• share data among processes
  
• 💡 process have independent memory, other process cannot access
  
• Shared Memory lets process ot share memory space
  
• 👍🏻 fastest in IPC
  

5. Memory Map

• like Shared Memory, but shares by mapping open file to memory
  
• share file+memory
  
• 👍🏻 for large files
  

6. Socket

• network socket communication
  
• client-server communication through socket
  
• server: bind, listen, accecpt/ client: connect