Interlocked.Increment 方法

定义

命名空间:: System.Threading

程序集:: netstandard.dll, System.Threading.dll

程序集:: mscorlib.dll, System.Threading.dll

程序集:: System.Threading.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

递增指定的变量，并将结果存储为原子操作。

重载

名称	说明
Increment(UInt32)	递增指定的变量，并将结果存储为原子操作。
Increment(UInt64)	递增指定的变量，并将结果存储为原子操作。
Increment(Int32)	递增指定的变量，并将结果存储为原子操作。
Increment(Int64)	递增指定的变量，并将结果存储为原子操作。

Increment(UInt32)

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

重要

此 API 不符合 CLS。

递增指定的变量，并将结果存储为原子操作。

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

要递增其值的变量。

UInt32

增量操作完成后的变量的值。

属性: CLSCompliantAttribute

例外

NullReferenceException

location地址是指针null。

适用于

Increment(UInt64)

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

Source:: Interlocked.cs

重要

此 API 不符合 CLS。

递增指定的变量，并将结果存储为原子操作。

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

要递增其值的变量。

UInt64

增量操作完成后的变量的值。

属性: CLSCompliantAttribute

例外

NullReferenceException

location地址是指针null。

适用于

Increment(Int32)

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

递增指定的变量，并将结果存储为原子操作。

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

要递增其值的变量。

Int32

增量操作完成后的变量的值。

例外

NullReferenceException

location地址是指针null。

示例

以下示例确定生成 1,000 个随机数需要多少个介于 0 到 1,000 的随机数，这些随机数具有中点值。为了跟踪中点值的数量，变量 midpointCount设置为等于 0，并且每次随机数生成器返回中点值时递增，直到达到 10,000。由于三个线程生成随机数， Increment(Int32) 因此调用该方法以确保多个线程不会并发更新 midpointCount 。请注意，锁还用于保护随机数生成器，并且对象用于确保Main该方法在三个CountdownEvent线程之前未完成执行。

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

以下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 GenerateNumbers 线程过程，对方法的调用 Task.WaitAll 消除了对象 CountdownEvent 的需求。

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

Source:: Interlocked.CoreCLR.cs

Source:: Interlocked.CoreCLR.cs

递增指定的变量，并将结果存储为原子操作。

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

要递增其值的变量。

Int64

增量操作完成后的变量的值。

例外

NullReferenceException

location地址是指针null。

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

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