public static void ListExample()
{
var list = new List <int>();
for (int i = 0; i < 1000; i++)
{
list.Add(i);
}
int count = 0;
object countLck = new object();
// Object to box counter
BoxedInt countObj = new BoxedInt
{
Counter = 0
};
Parallel.ForEach(list, (item) =>
{
Console.WriteLine($"I am working on item {item}");
// Atomically increment count....
Interlocked.Increment(ref count);
// .. or do it with locks, to isolate a critical section
lock (countLck) // An object is required here.
{
count++;
}
// Typically, you lock the entire object, if possible
// we previously used 'count', which is _not_ an object
lock (countObj)
{
countObj.Counter++;
}
});
Console.WriteLine($"count now is {count}");
Console.WriteLine($"countObj.Count now is {countObj.Counter}");
}
public static void ArrayExample()
{
const int size = 4;
int [] A = new int[size];
for (int i = 0; i < size; i++)
{
A[i] = i;
}
for (int i = 0; i < size; i++)
{
Console.WriteLine($"A[{i}] is {A[i]}");
}
Parallel.ForEach(A, (item) =>
{
item *= 2;
Console.WriteLine($"item now is {item}");
});
for (int i = 0; i < size; i++)
{
Console.WriteLine($"A[{i}] is {A[i]}");
}
var boxedList = BoxedInt.CreateList(A);
Parallel.ForEach(boxedList, (item) =>
{
item.Counter *= 2;
});
foreach (var i in boxedList)
{
Console.WriteLine(i);
}
}