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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 int stackSize;
public ThreadTaskScheduler(int StackReserveSize)
{
Contract.Requires(StackReserveSize >= 0);
stackSize = StackReserveSize;
}
protected override IEnumerable<Task> GetScheduledTasks()
{
// There is never a queue of scheduled, but not running, tasks.
// So return an empty list.
return new List<Task>();
}
protected override void QueueTask(Task task)
{
// Each queued task runs on a newly-created thread with the required
// stack size. The default .NET task scheduler is built on the .NET
// ThreadPool. Its policy allows it to create thousands of threads
// if it chooses.
//
// Boogie creates tasks which in turn create tasks and wait on them.
// So throttling tasks via a queue risks deadlock.
Thread th = new Thread(TaskMain, stackSize);
th.Start(task);
}
protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
{
return false;
}
private void TaskMain(object data)
{
Task t = (Task)data;
TryExecuteTask(t);
}
}
}
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