static void ForAll <T>(IList <T> data, int from, int to, Action <T> a0, Action <int> a1, int p)
{
int size = to - from;
int stride = (size + p - 1) / p;
var latch = new CountdownLatch(p);
for (int i = 0; i < p; i++)
{
int idx = i;
ThreadPool.QueueUserWorkItem(delegate {
int end = Math.Min(size, stride * (idx + 1));
for (int j = stride * idx; j < end; j++)
{
if (data != null)
{
a0(data[j]);
}
else
{
a1(j);
}
}
latch.Signal();
});
}
latch.Wait();
}
public static void ForAllPooled <T>(IEnumerable <T> data, Action <T> a, int p)
{
// create a pool of worker thread
var mutex = new object();
var latch = new CountdownLatch(p);
var q = new Queue <T>(data);
for (int i = 0; i < p; i++)
{
int idx = i;
ThreadPool.QueueUserWorkItem(delegate {
bool done = false;
while (!done)
{
T j = default(T);
lock (mutex) {
if (q.Count > 0)
{
j = q.Dequeue();
}
else
{
done = true;
}
}
if (j != null)
{
a(j);
}
}
latch.Signal();
});
}
latch.Wait();
}