Interlocked.Increment 方法

参考

定义

命名空间:: System.Threading

程序集:: System.Threading.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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以原子操作的形式递增指定变量的值并存储结果。

重载

Increment(UInt64)	以原子操作的形式递增指定变量的值并存储结果。
Increment(UInt32)	以原子操作的形式递增指定变量的值并存储结果。
Increment(Int32)	以原子操作的形式递增指定变量的值并存储结果。
Increment(Int64)	以原子操作的形式递增指定变量的值并存储结果。

Increment(UInt64)

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

重要

此 API 不符合 CLS。

以原子操作的形式递增指定变量的值并存储结果。

public:
 static System::UInt64 Increment(System::UInt64 % location);

[System.CLSCompliant(false)]
public static ulong Increment (ref ulong location);

[<System.CLSCompliant(false)>]
static member Increment : uint64 -> uint64

Public Shared Function Increment (ByRef location As ULong) As ULong

参数

location: UInt64

其值要递增的变量。

UInt64

增量操作完成后紧接变量的值。

属性: CLSCompliantAttribute

例外

NullReferenceException

location 的地址是一个 null 指针。

适用于

Increment(UInt32)

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

重要

此 API 不符合 CLS。

以原子操作的形式递增指定变量的值并存储结果。

public:
 static System::UInt32 Increment(System::UInt32 % location);

[System.CLSCompliant(false)]
public static uint Increment (ref uint location);

[<System.CLSCompliant(false)>]
static member Increment : uint32 -> uint32

Public Shared Function Increment (ByRef location As UInteger) As UInteger

参数

location: UInt32

其值要递增的变量。

UInt32

增量操作完成后紧接变量的值。

属性: CLSCompliantAttribute

例外

NullReferenceException

location 的地址是一个 null 指针。

适用于

Increment(Int32)

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

以原子操作的形式递增指定变量的值并存储结果。

public:
 static int Increment(int % location);

public static int Increment (ref int location);

static member Increment : int -> int

Public Shared Function Increment (ByRef location As Integer) As Integer

参数

location: Int32

其值要递增的变量。

Int32

增量操作完成后紧接变量的值。

例外

NullReferenceException

location 的地址是一个 null 指针。

示例

以下示例确定需要多少个介于 0 到 1,000 的随机数才能生成具有中点值的 1,000 个随机数。为了跟踪中点值的数量， midpointCount变量设置为等于 0，并在随机数生成器每次返回中点值时递增，直到它达到 10,000。由于三个线程生成随机数， Increment(Int32) 因此调用方法以确保多个线程不会同时更新 midpointCount 。请注意，锁还用于保护随机数生成器，并使用对象来确保Main方法不会在三个CountdownEvent线程之前完成执行。

using System;
using System.Threading;

public class Example
{
   const int LOWERBOUND = 0;
   const int UPPERBOUND = 1001;
   
   static Object lockObj = new Object();
   static Random rnd = new Random();
   static CountdownEvent cte;
   
   static int totalCount = 0;
   static int totalMidpoint = 0;
   static int midpointCount = 0;

   public static void Main()
   {
      cte = new CountdownEvent(1);
      // Start three threads. 
      for (int ctr = 0; ctr <= 2; ctr++) {
         cte.AddCount();
         Thread th = new Thread(GenerateNumbers);
         th.Name = "Thread" + ctr.ToString();
         th.Start();
      }
      cte.Signal();
      cte.Wait();
      Console.WriteLine();
      Console.WriteLine("Total midpoint values:  {0,10:N0} ({1:P3})",
                        totalMidpoint, totalMidpoint/((double)totalCount));
      Console.WriteLine("Total number of values: {0,10:N0}", 
                        totalCount);                  
   }

   private static void GenerateNumbers()
   {
      int midpoint = (UPPERBOUND - LOWERBOUND) / 2;
      int value = 0;
      int total = 0;
      int midpt = 0;
      
      do {
         lock (lockObj) {
            value = rnd.Next(LOWERBOUND, UPPERBOUND);
         }
         if (value == midpoint) { 
            Interlocked.Increment(ref midpointCount);
            midpt++;
         }
         total++;    
      } while (Volatile.Read(ref midpointCount) < 10000);
      
      Interlocked.Add(ref totalCount, total);
      Interlocked.Add(ref totalMidpoint, midpt);
      
      string s = String.Format("Thread {0}:\n", Thread.CurrentThread.Name) +
                 String.Format("   Random Numbers: {0:N0}\n", total) + 
                 String.Format("   Midpoint values: {0:N0} ({1:P3})", midpt, 
                               ((double) midpt)/total);
      Console.WriteLine(s);
      cte.Signal();
   }
}
// The example displays output like the following:
//       Thread Thread2:
//          Random Numbers: 2,776,674
//          Midpoint values: 2,773 (0.100 %)
//       Thread Thread1:
//          Random Numbers: 4,876,100
//          Midpoint values: 4,873 (0.100 %)
//       Thread Thread0:
//          Random Numbers: 2,312,310
//          Midpoint values: 2,354 (0.102 %)
//       
//       Total midpoint values:      10,000 (0.100 %)
//       Total number of values:  9,965,084

Imports System.Threading

Module Example
   Const LOWERBOUND As Integer = 0
   Const UPPERBOUND As Integer = 1001
   
   Dim lockObj As New Object()
   Dim rnd As New Random()
   Dim cte As CountdownEvent
   
   Dim totalCount As Integer = 0
   Dim totalMidpoint As Integer = 0
   Dim midpointCount As Integer = 0

   Public Sub Main()
      cte = New CountdownEvent(1)
      ' Start three threads. 
      For ctr As Integer = 0 To 2
         cte.AddCount()
         Dim th As New Thread(AddressOf GenerateNumbers)
         th.Name = "Thread" + ctr.ToString()
         th.Start()
      Next
      cte.Signal()
      cte.Wait()
      Console.WriteLine()
      Console.WriteLine("Total midpoint values:  {0,10:N0} ({1:P3})",
                        totalMidpoint, totalMidpoint/totalCount)
      Console.WriteLine("Total number of values: {0,10:N0}", 
                        totalCount)                  
   End Sub
   
   Private Sub GenerateNumbers()
      Dim midpoint As Integer = (upperBound - lowerBound) \ 2
      Dim value As Integer = 0
      Dim total As Integer = 0
      Dim midpt As Integer = 0
      Do
         SyncLock lockObj
            value = rnd.Next(lowerBound, upperBound)
         End SyncLock
         If value = midpoint Then 
            Interlocked.Increment(midpointCount)
            midpt += 1
         End If
         total += 1    
      Loop While midpointCount < 10000
      
      Interlocked.Add(totalCount, total)
      Interlocked.Add(totalMidpoint, midpt)
      
      Dim s As String = String.Format("Thread {0}:", Thread.CurrentThread.Name) + vbCrLf +
                        String.Format("   Random Numbers: {0:N0}", total) + vbCrLf +
                        String.Format("   Midpoint values: {0:N0} ({1:P3})", midpt, midpt/total)
      Console.WriteLine(s)
      cte.Signal()
   End Sub
End Module
' The example displays output like the following:
'       Thread Thread2:
'          Random Numbers: 2,776,674
'          Midpoint values: 2,773 (0.100 %)
'       Thread Thread1:
'          Random Numbers: 4,876,100
'          Midpoint values: 4,873 (0.100 %)
'       Thread Thread0:
'          Random Numbers: 2,312,310
'          Midpoint values: 2,354 (0.102 %)
'       
'       Total midpoint values:      10,000 (0.100 %)
'       Total number of values:  9,965,084

下面的示例与上一个示例类似，只不过它使用 Task 类而不是线程过程来生成 50,000 个随机中点整数。在此示例中，lambda 表达式替换了 GenerateNumbers 线程过程，对方法的调用 Task.WaitAll 消除了对 CountdownEvent 对象的需要。

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

public class Example
{
   const int LOWERBOUND = 0;
   const int UPPERBOUND = 1001;
   
   static Object lockObj = new Object();
   static Random rnd = new Random();
   
   static int totalCount = 0;
   static int totalMidpoint = 0;
   static int midpointCount = 0;

   public static void Main()
   {
      List<Task> tasks = new List<Task>();
      // Start three tasks. 
      for (int ctr = 0; ctr <= 2; ctr++) 
         tasks.Add(Task.Run( () => { int midpoint = (UPPERBOUND - LOWERBOUND) / 2;
                                     int value = 0;
                                     int total = 0;
                                     int midpt = 0;
                                    
                                     do {
                                        lock (lockObj) {
                                           value = rnd.Next(LOWERBOUND, UPPERBOUND);
                                        }
                                        if (value == midpoint) { 
                                           Interlocked.Increment(ref midpointCount);
                                           midpt++;
                                        }
                                        total++;    
                                     } while (Volatile.Read(ref midpointCount) < 50000);
                                    
                                     Interlocked.Add(ref totalCount, total);
                                     Interlocked.Add(ref totalMidpoint, midpt);
                                    
                                     string s = String.Format("Task {0}:\n", Task.CurrentId) +
                                                String.Format("   Random Numbers: {0:N0}\n", total) + 
                                                String.Format("   Midpoint values: {0:N0} ({1:P3})", midpt, 
                                                              ((double) midpt)/total);
                                     Console.WriteLine(s); } ));
      
      Task.WaitAll(tasks.ToArray());
      Console.WriteLine();
      Console.WriteLine("Total midpoint values:  {0,10:N0} ({1:P3})",
                        totalMidpoint, totalMidpoint/((double)totalCount));
      Console.WriteLine("Total number of values: {0,10:N0}", 
                        totalCount);                  
   }
}
// The example displays output like the following:
//       Task 3:
//          Random Numbers: 10,855,250
//          Midpoint values: 10,823 (0.100 %)
//       Task 1:
//          Random Numbers: 15,243,703
//          Midpoint values: 15,110 (0.099 %)
//       Task 2:
//          Random Numbers: 24,107,425
//          Midpoint values: 24,067 (0.100 %)
//       
//       Total midpoint values:      50,000 (0.100 %)
//       Total number of values: 50,206,378

Imports System.Collections.Generic
Imports System.Threading
Imports System.Threading.Tasks

Module Example
   Const LOWERBOUND As Integer = 0
   Const UPPERBOUND As Integer = 1001
   
   Dim lockObj As New Object()
   Dim rnd As New Random()
   
   Dim totalCount As Integer = 0
   Dim totalMidpoint As Integer = 0
   Dim midpointCount As Integer = 0

   Public Sub Main()
      Dim tasks As New List(Of Task)()
      ' Start three tasks. 
      For ctr As Integer = 0 To 2
         tasks.Add(Task.Run( Sub()
                                Dim midpoint As Integer = (upperBound - lowerBound) \ 2
                                Dim value As Integer = 0
                                Dim total As Integer = 0
                                Dim midpt As Integer = 0
                                Do
                                   SyncLock lockObj
                                      value = rnd.Next(lowerBound, upperBound)
                                   End SyncLock
                                   If value = midpoint Then 
                                      Interlocked.Increment(midpointCount)
                                      midpt += 1
                                   End If
                                   total += 1    
                                Loop While midpointCount < 50000
                              
                                Interlocked.Add(totalCount, total)
                                Interlocked.Add(totalMidpoint, midpt)
                              
                                Dim s As String = String.Format("Task {0}:", Task.CurrentId) + vbCrLf +
                                                  String.Format("   Random Numbers: {0:N0}", total) + vbCrLf +
                                                  String.Format("   Midpoint values: {0:N0} ({1:P3})", midpt, midpt/total)
                                Console.WriteLine(s)
                             End Sub ))
      Next

      Task.WaitAll(tasks.ToArray())
      Console.WriteLine()
      Console.WriteLine("Total midpoint values:  {0,10:N0} ({1:P3})",
                        totalMidpoint, totalMidpoint/totalCount)
      Console.WriteLine("Total number of values: {0,10:N0}", 
                        totalCount)                  
   End Sub
End Module
' The example displays output like the following:
'       Task 3:
'          Random Numbers: 10,855,250
'          Midpoint values: 10,823 (0.100 %)
'       Task 1:
'          Random Numbers: 15,243,703
'          Midpoint values: 15,110 (0.099 %)
'       Task 2:
'          Random Numbers: 24,107,425
'          Midpoint values: 24,067 (0.100 %)
'       
'       Total midpoint values:      50,000 (0.100 %)
'       Total number of values: 50,206,378

注解

此方法通过包装处理溢出条件：如果 location = Int32.MaxValue， location + 1 = 。 Int32.MinValue 不会引发异常。

另请参阅

适用于

Increment(Int64)

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

以原子操作的形式递增指定变量的值并存储结果。

public:
 static long Increment(long % location);

public static long Increment (ref long location);

static member Increment : int64 -> int64

Public Shared Function Increment (ByRef location As Long) As Long

参数

location: Int64

其值要递增的变量。

Int64

增量操作完成后紧接变量的值。

例外

NullReferenceException

location 的地址是一个 null 指针。

注解

此方法通过包装处理溢出条件：如果 location = Int64.MaxValue， location + 1 = 。 Int64.MinValue 不会引发异常。

另请参阅

适用于

通过

Interlocked.Increment 方法

定义

重载

Increment(UInt64)

参数

返回

例外

适用于

Increment(UInt32)

参数

返回

例外

适用于

Increment(Int32)

参数

返回

例外

示例

注解

另请参阅

适用于

Increment(Int64)

参数

返回

例外

注解

另请参阅

适用于

其他资源