ConcurrentExclusiveSchedulerPair 类

定义

命名空间:

System.Threading.Tasks

程序集:

System.Threading.Tasks.dll

程序集:

System.Runtime.dll

程序集:

mscorlib.dll

程序集:

netstandard.dll

提供任务计划程序，其用于执行任务，同时确保并发任务可同时运行，而独占任务从不运行。

public ref class ConcurrentExclusiveSchedulerPair

public class ConcurrentExclusiveSchedulerPair

type ConcurrentExclusiveSchedulerPair = class

Public Class ConcurrentExclusiveSchedulerPair

继承

Object

ConcurrentExclusiveSchedulerPair

示例

下例显示了 ConcurrentExclusiveSchedulerPair 类的用法。 读取器在计划程序并发部分运行。 编写器在计划程序独占部分运行。 此代码示例是 有关如何：在数据流块文章中指定任务计划程序的大型示例的一 部分。

// 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);

' 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.
Dim 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.
Dim readerActions = From checkBox In New CheckBox() {checkBox1, checkBox2, checkBox3}
                    Select New ActionBlock(Of Integer)(Sub(milliseconds)
                                                           ' Toggle the check box to the checked state.
                                                           ' Perform the read action. For demonstration, suspend the current
                                                           ' thread to simulate a lengthy read operation.
                                                           ' Toggle the check box to the unchecked state.
                                                           toggleCheckBox.Post(checkBox)
                                                           Thread.Sleep(milliseconds)
                                                           toggleCheckBox.Post(checkBox)
                                                       End Sub, New ExecutionDataflowBlockOptions With {.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.
Dim writerAction = New ActionBlock(Of Integer)(Sub(milliseconds)
                                                   ' Toggle the check box to the checked state.
                                                   ' Perform the write action. For demonstration, suspend the current
                                                   ' thread to simulate a lengthy write operation.
                                                   ' Toggle the check box to the unchecked state.
                                                   toggleCheckBox.Post(checkBox4)
                                                   Thread.Sleep(milliseconds)
                                                   toggleCheckBox.Post(checkBox4)
                                               End Sub, New ExecutionDataflowBlockOptions With {.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.
For Each readerAction In readerActions
    broadcaster.LinkTo(readerAction)
Next readerAction
broadcaster.LinkTo(writerAction)

构造函数

ConcurrentExclusiveSchedulerPair()	初始化 ConcurrentExclusiveSchedulerPair 类的新实例。
ConcurrentExclusiveSchedulerPair(TaskScheduler)	用指定的计划程序目标初始化 ConcurrentExclusiveSchedulerPair 类的新实例。
ConcurrentExclusiveSchedulerPair(TaskScheduler, Int32)	初始化针对最大并发级别的指定计划程序 ConcurrentExclusiveSchedulerPair 类的新实例。
ConcurrentExclusiveSchedulerPair(TaskScheduler, Int32, Int32)	初始化 ConcurrentExclusiveSchedulerPair 类的新实例，该实例针对最大并发级别和最大计划任务数的指定计划程序，并可能作为一个单元来处理。

属性

Completion	当调度程序已经完成处理过程时，获取将要完成的 Task。
ConcurrentScheduler	获取可用于调度任务到此添加线对的 TaskScheduler，其中的线对可以与此线对上的其他任务同时运行。
ExclusiveScheduler	获取可用于调度任务到此添加线对的 TaskScheduler，其中的线对必须独占地运行，不考虑此线对上的其他任务。

方法

Complete()	通知不能接受更多任务的计划程序对。
Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)