v/vlib/v/tests/autolock_array2_test.v

import sync

const (
	iterations_per_thread2 = 100000
)

fn inc_elements(shared foo []int, n int, mut sem sync.Semaphore) {
	for _ in 0 .. iterations_per_thread2 {
		foo[n]++
	}
	sem.post() // indicat that thread is finished
}

fn test_autolocked_array_2() {
	shared abc := &[0, 0, 0]
	mut sem := sync.new_semaphore()
	spawn inc_elements(shared abc, 1, mut sem)
	spawn inc_elements(shared abc, 2, mut sem)
	for _ in 0 .. iterations_per_thread2 {
		unsafe {
			abc[2]++
		}
	}
	// wait for the 2 coroutines to finish using the semaphore
	for _ in 0 .. 2 {
		sem.wait()
	}
	rlock abc {
		assert unsafe { abc[1] } == iterations_per_thread2
		assert unsafe { abc[2] } == 2 * iterations_per_thread2
	}
}