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Nat computeSum(Nat n, Str progressText) {
Nat sum = 0;
for (Nat i = 1; i <= n; i++) {
sum += i;
print("${progressText}: at ${i}, sum ${sum}");
sleep(1 s);
}
return sum;
}
Word fibonacci(Nat n) {
if (n < 2)
return n;
else
return fibonacci(n - 1) + fibonacci(n - 2);
}
thread FibA;
thread FibB;
Word fibonacciA(Nat n) on FibA {
return fibonacci(n);
}
Word fibonacciB(Nat n) on FibB {
return fibonacci(n);
}
class Data {
Nat value;
init() {}
init(Data other) {
init { value = other.value; }
print("Copied data!");
}
}
thread MyThread;
Data modifyData(Data toModify) on MyThread {
toModify.value = 10;
return toModify;
}
class ActorData on MyThread {
Nat value;
void set(Nat newValue) {
value = newValue;
}
void add(Nat toAdd) {
value = value + toAdd;
}
}
ActorData modifyData(ActorData toModify) on MyThread {
toModify.value = 10;
return toModify;
}
thread MyOtherThread;
void addData(ActorData toUpdate, Nat toAdd) on MyOtherThread {
toUpdate.set(toUpdate.value + toAdd);
}
void addData2(ActorData toUpdate, Nat toAdd) on MyOtherThread {
toUpdate.add(toAdd);
}
void main() {
{
print("-- Spawn ---");
Future<Nat> sum3 = spawn computeSum(3, "To 3");
Nat sum5 = computeSum(5, "To 5");
print("Sum of 1 to 3 is: ${sum3.result}");
print("Sum of 1 to 5 is: ${sum5}");
}
{
print("-- Threads, same OS thread --");
Moment start;
Future<Word> value1 = spawn fibonacci(40);
Future<Word> value2 = spawn fibonacci(41);
print("Finished fibonacci(40)=${value1.result}");
print("Finished fibonacci(41)=${value2.result}");
Moment end;
print("Total time: ${end - start}");
}
{
print("-- Threads, different OS threads --");
Moment start;
Future<Word> value1 = spawn fibonacciA(40);
Future<Word> value2 = spawn fibonacciB(41);
print("Finished fibonacci(40)=${value1.result}");
print("Finished fibonacci(41)=${value2.result}");
Moment end;
print("Total time: ${end - start}");
}
{
print("-- Sharing data --");
Data data;
Future<Data> modify = spawn modifyData(data);
data.value = 20;
Data modified = modify.result();
print("After modifications: ${data.value}");
print("Returned object: ${modified.value}");
print("Are they the same? ${data is modified}");
}
{
print("-- Sharing data with actors --");
ActorData data;
Future<ActorData> modify = spawn modifyData(data);
data.set(20);
ActorData modified = modify.result();
print("After modifications: ${data.value}");
print("Returned object: ${modified.value}");
print("Are they the same? ${data is modified}");
}
{
print("-- Thread-safe operations, incorrect --");
ActorData data;
Future<void> modify = spawn addData(data, 20);
for (Nat i = 0; i < 10; i++) {
data.set(data.value + 10);
}
modify.result();
print("Final result: ${data.value}");
}
{
print("-- Thread-safe operations, correct --");
ActorData data;
Future<void> modify = spawn addData2(data, 20);
for (Nat i = 0; i < 10; i++) {
data.add(10);
}
modify.result();
print("Final result: ${data.value}");
}
}
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