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ConcurrentExclusiveSchedulerPair Class

.NET Framework 4.6 and 4.5

Provides task schedulers that coordinate to execute tasks while ensuring that concurrent tasks may run concurrently and exclusive tasks never do.

System.Object
  System.Threading.Tasks.ConcurrentExclusiveSchedulerPair

Namespace:  System.Threading.Tasks
Assemblies:   System.Threading.Tasks (in System.Threading.Tasks.dll)
  mscorlib (in mscorlib.dll)

public class ConcurrentExclusiveSchedulerPair

The ConcurrentExclusiveSchedulerPair type exposes the following members.

  NameDescription
Public methodConcurrentExclusiveSchedulerPair()Initializes a new instance of the ConcurrentExclusiveSchedulerPair class.
Public methodConcurrentExclusiveSchedulerPair(TaskScheduler)Initializes a new instance of the ConcurrentExclusiveSchedulerPair class that targets the specified scheduler.
Public methodConcurrentExclusiveSchedulerPair(TaskScheduler, Int32)Initializes a new instance of the ConcurrentExclusiveSchedulerPair class that targets the specified scheduler with a maximum concurrency level.
Public methodConcurrentExclusiveSchedulerPair(TaskScheduler, Int32, Int32)Initializes a new instance of the ConcurrentExclusiveSchedulerPair class that targets the specified scheduler with a maximum concurrency level and a maximum number of scheduled tasks that may be processed as a unit.
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  NameDescription
Public propertyCompletionGets a Task that will complete when the scheduler has completed processing.
Public propertyConcurrentSchedulerGets a TaskScheduler that can be used to schedule tasks to this pair that may run concurrently with other tasks on this pair.
Public propertyExclusiveSchedulerGets a TaskScheduler that can be used to schedule tasks to this pair that must run exclusively with regards to other tasks on this pair.
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  NameDescription
Public methodCompleteInforms the scheduler pair that it should not accept any more tasks.
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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The following example shows the use of the ConcurrentExclusiveSchedulerPair class. Readers run on the concurrent part of the scheduler. The writer runs on the exclusive part of the scheduler. This code example is part of a larger example provided for the How to: Specify a Task Scheduler in a Dataflow Block topic.

// Create a ConcurrentExclusiveSchedulerPair object. 
// Readers will run on the concurrent part of the scheduler pair. 
// The writer will run on the exclusive part of the scheduler pair. 
var taskSchedulerPair = new ConcurrentExclusiveSchedulerPair();

// Create an ActionBlock<int> object for each reader CheckBox object. 
// Each ActionBlock<int> object represents an action that can read  
// from a resource in parallel to other readers. 
// Specifying the concurrent part of the scheduler pair enables the  
// reader to run in parallel to other actions that are managed by  
// that scheduler. 
var readerActions = 
   from checkBox in new CheckBox[] {checkBox1, checkBox2, checkBox3}
   select new ActionBlock<int>(milliseconds =>
   {
      // Toggle the check box to the checked state.
      toggleCheckBox.Post(checkBox);

      // Perform the read action. For demonstration, suspend the current 
      // thread to simulate a lengthy read operation.
      Thread.Sleep(milliseconds);

      // Toggle the check box to the unchecked state.
      toggleCheckBox.Post(checkBox);
   },
   new ExecutionDataflowBlockOptions
   {
      TaskScheduler = taskSchedulerPair.ConcurrentScheduler
   });

// Create an ActionBlock<int> object for the writer CheckBox object. 
// This ActionBlock<int> object represents an action that writes to  
// a resource, but cannot run in parallel to readers. 
// Specifying the exclusive part of the scheduler pair enables the  
// writer to run in exclusively with respect to other actions that are  
// managed by the scheduler pair. 
var writerAction = new ActionBlock<int>(milliseconds =>
{
   // Toggle the check box to the checked state.
   toggleCheckBox.Post(checkBox4);

   // Perform the write action. For demonstration, suspend the current 
   // thread to simulate a lengthy write operation.
   Thread.Sleep(milliseconds);

   // Toggle the check box to the unchecked state.
   toggleCheckBox.Post(checkBox4);
},
new ExecutionDataflowBlockOptions
{
   TaskScheduler = taskSchedulerPair.ExclusiveScheduler
});

// Link the broadcaster to each reader and writer block. 
// The BroadcastBlock<T> class propagates values that it  
// receives to all connected targets. 
foreach (var readerAction in readerActions)
{
   broadcaster.LinkTo(readerAction);
}
broadcaster.LinkTo(writerAction);

.NET Framework

Supported in: 4.6, 4.5

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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