# CSP

**[CSP](https://en.wikipedia.org/wiki/Communicating_sequential_processes)** (Communicating Sequential Processes) is a concurrency model where independent processes coordinate purely through message passing over **channels**, with no shared memory. Send and receive operations are **synchronous** (rendezvous): the sender and receiver synchronize at the point of communication.

Go's channels are the most widely used CSP implementation; unlike [[sync-mbox|mailbox]] queues, channels are anonymous and tied to specific processes.

## Example

This example shows CSP-style channel communication:

```go
// compile: go run csp.go
// description: synchronous channel send/receive (rendezvous)

package main
import "fmt"

func main() {
    ch := make(chan int)
    
    go func() {
        ch <- 42  // send: blocks until receiver is ready
    }()
    
    result := <-ch  // receive: blocks until sender is ready
    fmt.Println("Received:", result)
}
```