In this Swift version, we’ve made the following changes:
We use NSLock for mutual exclusion, which is similar to Go’s sync.Mutex.
The Container is implemented as a class, which is reference-typed in Swift, similar to how the Go version uses a pointer to the struct.
We use a DispatchGroup and DispatchQueue for concurrency, which is Swift’s equivalent to Go’s goroutines and WaitGroup.
The inc method is implemented within the Container class, and we’ve added a getCounters method to safely access the counters.
We use Swift’s defer statement to ensure the lock is always unlocked, similar to the Go version.
Instead of goroutines, we use DispatchQueue.global().async to run tasks concurrently.
Running this program should show that the counters are updated as expected:
This example demonstrates how to use locks in Swift to safely access shared data across multiple threads. The NSLock ensures that only one thread can access the counters dictionary at a time, preventing race conditions.
Next, we could look at implementing this same state management task using only Grand Central Dispatch and Swift’s built-in concurrency features.