Kas sa saad selgitada, mis on tingimusmuutuja sync.Cond Go keeles ja milleks seda kasutatakse?

In the Go language, sync.Cond is a structure that implements a condition variable, used for synchronizing goroutines. It allows one or more goroutines to wait for a specific condition to be met and to notify other goroutines that this condition has changed.

Main methods of sync.Cond:

• Wait() — blocks the current goroutine until another goroutine calls Signal() or Broadcast().
• Signal() — wakes up one goroutine waiting on the condition variable.
• Broadcast() — wakes up all goroutines waiting on the condition variable.

Example of usage:

var mu sync.Mutex
cond := sync.NewCond(&mu)

// Goroutine waiting for a signal
go func() {
    mu.Lock()
    cond.Wait() // waiting for the signal
    // after waking up, perform actions
    mu.Unlock()
}()

// Goroutine sending the signal
mu.Lock()
cond.Signal() // wakes up one goroutine
mu.Unlock()

This way, sync.Cond helps coordinate the work of multiple goroutines waiting for certain conditions to be met.