Initial project import

tools/v/examples/thread_safety/atomic_counter.v

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+/*
+This code demonstrates thread safety using atomic operations in V.
+
+Thread safety is achieved by using atomic functions to manipulate the shared counter variable.
+Atomic operations ensure that the read-modify-write sequence is performed as a single, indivisible operation,
+preventing race conditions and ensuring data integrity when accessed by multiple threads concurrently.
+
+Key points:
+1. **Atomic Fetch and Add**: The `C.atomic_fetch_add_u32` function atomically increments the counter.
+	This means that the increment operation is performed without interruption, ensuring that no two threads
+	can increment the counter simultaneously and cause a race condition.
+
+2. **Atomic Load**: The `C.atomic_load_u32` function atomically reads the value of the counter.
+	This ensures that the read operation is consistent and not affected by concurrent writes from other threads.
+
+3. **Thread Synchronization**: The `spawn` function is used to create new threads that run the `increment` function.
+	The `wait` method is called on each thread to ensure that the main thread waits for both threads to complete
+	before reading the final value of the counter.
+
+By using atomic operations and proper thread synchronization, the code ensures that the shared counter is
+incremented safely and correctly by multiple threads.
+*/
+import sync as _
+
+// Function to increment the atomic counter
+fn increment(atomic_counter &u32) {
+	C.atomic_fetch_add_u32(atomic_counter, 1)
+}
+
+fn main() {
+	atomic_counter := u32(0) // Atomic counter variable
+
+	// Spawn two threads that increment the atomic counter
+	t1 := spawn increment(&atomic_counter)
+	t2 := spawn increment(&atomic_counter)
+
+	// Wait for both threads to complete
+	t1.wait()
+	t2.wait()
+
+	// Load and print the final value of the atomic counter
+	final_count := C.atomic_load_u32(&atomic_counter)
+	println('Atomic Counter: ${final_count}')
+}