What methods of inter-process communication do you know?

Channels: The primary idiomatic method in Go. Typed pipelines for passing values between goroutines or processes (when using external tools, e.g., Unix sockets).

// Example of using a channel for communication between goroutines
ch := make(chan int)
go func() {
    ch <- 1 // send value
}()
value := <-ch // receive value

Mutexes and atomic operations: To protect shared data when accessed from multiple processes.

import (
    "sync"
    "sync/atomic"
)

var mu sync.Mutex
var counter int

func incrementWithMutex() {
    mu.Lock()
    counter++
    mu.Unlock()
}

var atomicCounter int32

func incrementWithAtomic() {
    atomic.AddInt32(&atomicCounter, 1)
}

Shared memory: When used directly, it can be complex to manage and prone to race conditions. Usually implemented through other mechanisms (e.g., memory-mapped files).

Network interactions (TCP/UDP): A classic method for inter-process communication, especially for distributed systems. Go provides rich capabilities for network operations.

// On the server side:
/*
   listener, _ := net.Listen("tcp", ":8080")
   conn, _ := listener.Accept()
   // read/write data through conn
*/

// On the client side:
/*
   conn, _ := net.Dial("tcp", "localhost:8080")
   // read/write data through conn
*/

OS IPC mechanisms:

• Unix domain sockets: An efficient way for processes to communicate on the same machine.
• Named pipes: For unidirectional or bidirectional communication.
• Signals: For asynchronous notifications between processes.

Files: Processes can exchange data by reading and writing to shared files. Locks should be used to prevent race conditions.

Databases and message brokers: For more complex scenarios, asynchronous communication, and reliability. Examples include Kafka, RabbitMQ, Redis (pub/sub), PostgreSQL.