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v/vlib/sync/stdatomic/atomic_test.v

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import sync
import sync.stdatomic
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const iterations_per_cycle = 100_000
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struct Counter {
mut:
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counter u64
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}
// without proper syncronization this would fail
fn test_count_10_times_1_cycle_should_result_10_cycles_with_sync() {
desired_iterations := 10 * iterations_per_cycle
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mut wg := sync.new_waitgroup()
mut counter := &Counter{}
wg.add(10)
for i := 0; i < 10; i++ {
go count_one_cycle(mut counter, mut wg)
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}
wg.wait()
assert counter.counter == desired_iterations
eprintln(' with synchronization the counter is: ${counter.counter:10} , expectedly == ${desired_iterations:10}')
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}
// This test just to make sure that we have an anti-test to prove it works
fn test_count_10_times_1_cycle_should_not_be_10_cycles_without_sync() {
desired_iterations := 10 * iterations_per_cycle
mut wg := sync.new_waitgroup()
mut counter := &Counter{}
wg.add(10)
for i := 0; i < 10; i++ {
go count_one_cycle_without_sync(mut counter, mut wg)
}
wg.wait()
// NB: we do not assert here, just print, because sometimes by chance counter.counter may be == desired_iterations
eprintln('without synchronization the counter is: ${counter.counter:10} , expectedly != ${desired_iterations:10}')
}
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fn test_atomic_count_plus_one_u64() {
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mut c := u64(0)
stdatomic.add_u64(&c, 1)
assert stdatomic.load_u64(&c) == 1
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}
fn test_atomic_count_plus_one_i64() {
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mut c := i64(0)
stdatomic.add_i64(&c, 1)
assert stdatomic.load_i64(&c) == 1
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}
fn test_atomic_count_plus_greater_than_one_u64() {
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mut c := u64(0)
stdatomic.add_u64(&c, 10)
assert stdatomic.load_u64(&c) == 10
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}
fn test_atomic_count_plus_greater_than_one_i64() {
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mut c := i64(0)
stdatomic.add_i64(&c, 10)
assert stdatomic.load_i64(&c) == 10
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}
fn test_atomic_count_minus_one_u64() {
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mut c := u64(1)
stdatomic.sub_u64(&c, 1)
assert stdatomic.load_u64(&c) == 0
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}
fn test_atomic_count_minus_one_i64() {
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mut c := i64(0)
stdatomic.sub_i64(&c, 1)
assert stdatomic.load_i64(&c) == -1
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}
fn test_atomic_count_minus_greater_than_one_u64() {
mut c := u64(0)
stdatomic.store_u64(&c, 10)
stdatomic.sub_u64(&c, 10)
assert stdatomic.load_u64(&c) == 0
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}
fn test_atomic_count_minus_greater_than_one_i64() {
mut c := i64(0)
stdatomic.store_i64(&c, 10)
stdatomic.sub_i64(&c, 20)
assert stdatomic.load_i64(&c) == -10
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}
// count_one_cycle counts the common counter iterations_per_cycle times in thread-safe way
fn count_one_cycle(mut counter Counter, mut group sync.WaitGroup) {
for i := 0; i < iterations_per_cycle; i++ {
stdatomic.add_u64(&counter.counter, 1)
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}
group.done()
}
// count_one_cycle_without_sync counts the common counter iterations_per_cycle times in none thread-safe way
fn count_one_cycle_without_sync(mut counter Counter, mut group sync.WaitGroup) {
for i := 0; i < iterations_per_cycle; i++ {
counter.counter++
}
group.done()
}