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using System;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Microsoft.Boogie
{
// Implementation of System.Threading.Tasks.TaskScheduler which creates a unique thread per
// task, and allows each thread to have its own custom stack size. The standard
// scheduler uses the .NET threadpool, which in turn inherits stack size from the EXE.
public class ThreadTaskScheduler : TaskScheduler
{
private object tasklock; // Guards acess to the "tasks" queue
private Queue<Task> tasks;
private Thread[] dispatchers;
private ManualResetEvent eventsWaiting;
private int stackSize;
public ThreadTaskScheduler(int StackReserveSize)
{
int MaxThreads = System.Environment.ProcessorCount;
Initialize(StackReserveSize, MaxThreads);
}
public ThreadTaskScheduler(int StackReserveSize, int MaxThreads)
{
Initialize(StackReserveSize, MaxThreads);
}
void Initialize(int StackReserveSize, int MaxThreads)
{
Contract.Requires(StackReserveSize >= 0);
Contract.Requires(MaxThreads > 0);
tasklock = new object();
tasks = new Queue<Task>();
eventsWaiting = new ManualResetEvent(false);
stackSize = StackReserveSize;
dispatchers = new Thread[MaxThreads];
for (int i = 0; i < MaxThreads; ++i)
{
dispatchers[i] = new Thread(new ThreadStart(DispatcherMain));
dispatchers[i].IsBackground = true;
dispatchers[i].Start();
}
}
protected override IEnumerable<Task> GetScheduledTasks()
{
IEnumerable<Task> r;
lock(tasklock)
{
r=tasks.ToArray<Task>();
}
return r;
}
protected override void QueueTask(Task task)
{
lock (tasklock)
{
tasks.Enqueue(task);
eventsWaiting.Set();
}
}
protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
{
return false;
}
private void DispatcherMain()
{
while (true)
{
Task t = null;
lock (tasklock)
{
if (tasks.Count > 0)
{
t = tasks.Dequeue();
if (tasks.Count == 0)
{
eventsWaiting.Reset();
}
}
}
if (t != null)
{
Thread th = new Thread(TaskMain, stackSize);
th.Start(t);
th.Join();
}
else
{
eventsWaiting.WaitOne();
}
}
}
private void TaskMain(object data)
{
Task t = (Task)data;
TryExecuteTask(t);
}
}
}
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