Initial project import

tools/v/vlib/sync/many_times.v

@@ -0,0 +1,36 @@
+module sync
+
+import sync.stdatomic
+
+pub struct ManyTimes {
+mut:
+	m RwMutex
+pub:
+	times u64 = 1
+	count u64
+}
+
+// new_many_times return a new ManyTimes struct.
+pub fn new_many_times(times u64) &ManyTimes {
+	mut many_times := &ManyTimes{
+		times: times
+	}
+	many_times.m.init()
+	return many_times
+}
+
+// do execute the function only setting times.
+pub fn (mut m ManyTimes) do(f fn ()) {
+	if stdatomic.load_u64(&m.count) < m.times {
+		m.do_slow(f)
+	}
+}
+
+fn (mut m ManyTimes) do_slow(f fn ()) {
+	m.m.lock()
+	if m.count < m.times {
+		stdatomic.store_u64(&m.count, m.count + 1)
+		f()
+	}
+	m.m.unlock()
+}