public static void DegreeOfParallelism_Barrier(Labeled <ParallelQuery <int> > labeled, int count, int degree)
{
using (ThreadPoolHelpers.EnsureMinThreadsAtLeast(degree))
{
var barrier = new Barrier(degree);
Assert.Equal(Functions.SumRange(0, count), labeled.Item.WithDegreeOfParallelism(degree).Sum(x => { barrier.SignalAndWait(); return(x); }));
}
}
public static void DegreeOfParallelism_Pipelining(Labeled <ParallelQuery <int> > labeled, int count, int degree)
{
using (ThreadPoolHelpers.EnsureMinThreadsAtLeast(degree))
{
int expected = 1 - count;
foreach (int result in labeled.Item.WithDegreeOfParallelism(degree).Select(x => - x).OrderBy(x => x))
{
Assert.Equal(expected++, result);
}
}
}
public static void DegreeOfParallelism_Throttled_Pipelining(Labeled <ParallelQuery <int> > labeled, int count, int degree)
{
using (ThreadPoolHelpers.EnsureMinThreadsAtLeast(degree))
{
Assert.True(labeled.Item.WithDegreeOfParallelism(degree).Select(x =>
{
var sw = new SpinWait();
while (!sw.NextSpinWillYield)
{
sw.SpinOnce(); // brief spin to wait a small amount of time
}
return(-x);
}).OrderBy(x => x).SequenceEqual(ParallelEnumerable.Range(1 - count, count).AsOrdered()));
}
}
static TaskRunSyncTests()
{
// Tests that create tasks which need to run concurrently require us to bump up the number
// of threads in the pool, or else we need to wait for it to grow dynamically to the desired number
ThreadPoolHelpers.EnsureMinThreadsAtLeast(10);
}