Monitor.Enter 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得指定之物件的獨佔鎖定。
多載
| Enter(Object) |
取得指定物件的獨佔鎖定。 |
| Enter(Object, Boolean) |
取得指定之物件的獨佔鎖定，並且完整設定值，指出是否採用鎖定。 |
Enter(Object)
- 來源:
- Monitor.cs
- 來源:
- Monitor.cs
- 來源:
- Monitor.cs
取得指定物件的獨佔鎖定。
public:
static void Enter(System::Object ^ obj);public static void Enter (object obj);static member Enter : obj -> unitPublic Shared Sub Enter (obj As Object)參數
- obj
- Object
要從其上取得監視器鎖定的物件。
例外狀況
obj 參數為 null。
範例
下列範例示範如何使用 Enter 方法。
#using <System.dll>
using namespace System;
using namespace System::Threading;
using namespace System::Collections::Generic;
using namespace System::Text;
generic <typename T> public ref class SafeQueue
{
private:
// A queue that is protected by Monitor.
Queue<T>^ m_inputQueue;
public:
SafeQueue()
{
m_inputQueue = gcnew Queue<T>();
};
// Lock the queue and add an element.
void Enqueue(T qValue)
{
// Request the lock, and block until it is obtained.
Monitor::Enter(m_inputQueue);
try
{
// When the lock is obtained, add an element.
m_inputQueue->Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
};
// Try to add an element to the queue: Add the element to the queue
// only if the lock is immediately available.
bool TryEnqueue(T qValue)
{
// Request the lock.
if (Monitor::TryEnter(m_inputQueue))
{
try
{
m_inputQueue->Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
return true;
}
else
{
return false;
}
};
// Try to add an element to the queue: Add the element to the queue
// only if the lock becomes available during the specified time
// interval.
bool TryEnqueue(T qValue, int waitTime)
{
// Request the lock.
if (Monitor::TryEnter(m_inputQueue, waitTime))
{
try
{
m_inputQueue->Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
return true;
}
else
{
return false;
}
};
// Lock the queue and dequeue an element.
T Dequeue()
{
T retval;
// Request the lock, and block until it is obtained.
Monitor::Enter(m_inputQueue);
try
{
// When the lock is obtained, dequeue an element.
retval = m_inputQueue->Dequeue();
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
return retval;
};
// Delete all elements that equal the given object.
int Remove(T qValue)
{
int removedCt = 0;
// Wait until the lock is available and lock the queue.
Monitor::Enter(m_inputQueue);
try
{
int counter = m_inputQueue->Count;
while (counter > 0)
// Check each element.
{
T elem = m_inputQueue->Dequeue();
if (!elem->Equals(qValue))
{
m_inputQueue->Enqueue(elem);
}
else
{
// Keep a count of items removed.
removedCt += 1;
}
counter = counter - 1;
}
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
return removedCt;
};
// Print all queue elements.
String^ PrintAllElements()
{
StringBuilder^ output = gcnew StringBuilder();
// Lock the queue.
Monitor::Enter(m_inputQueue);
try
{
for each ( T elem in m_inputQueue )
{
// Print the next element.
output->AppendLine(elem->ToString());
}
}
finally
{
// Ensure that the lock is released.
Monitor::Exit(m_inputQueue);
}
return output->ToString();
};
};
public ref class Example
{
private:
static SafeQueue<int>^ q = gcnew SafeQueue<int>();
static int threadsRunning = 0;
static array<array<int>^>^ results = gcnew array<array<int>^>(3);
static void ThreadProc(Object^ state)
{
DateTime finish = DateTime::Now.AddSeconds(10);
Random^ rand = gcnew Random();
array<int>^ result = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
int threadNum = (int) state;
while (DateTime::Now < finish)
{
int what = rand->Next(250);
int how = rand->Next(100);
if (how < 16)
{
q->Enqueue(what);
result[(int)ThreadResultIndex::EnqueueCt] += 1;
}
else if (how < 32)
{
if (q->TryEnqueue(what))
{
result[(int)ThreadResultIndex::TryEnqueueSucceedCt] += 1;
}
else
{
result[(int)ThreadResultIndex::TryEnqueueFailCt] += 1;
}
}
else if (how < 48)
{
// Even a very small wait significantly increases the success
// rate of the conditional enqueue operation.
if (q->TryEnqueue(what, 10))
{
result[(int)ThreadResultIndex::TryEnqueueWaitSucceedCt] += 1;
}
else
{
result[(int)ThreadResultIndex::TryEnqueueWaitFailCt] += 1;
}
}
else if (how < 96)
{
result[(int)ThreadResultIndex::DequeueCt] += 1;
try
{
q->Dequeue();
}
catch (Exception^ ex)
{
result[(int)ThreadResultIndex::DequeueExCt] += 1;
}
}
else
{
result[(int)ThreadResultIndex::RemoveCt] += 1;
result[(int)ThreadResultIndex::RemovedCt] += q->Remove(what);
}
}
results[threadNum] = result;
if (0 == Interlocked::Decrement(threadsRunning))
{
StringBuilder^ sb = gcnew StringBuilder(
" Thread 1 Thread 2 Thread 3 Total\n");
for (int row = 0; row < 9; row++)
{
int total = 0;
sb->Append(titles[row]);
for(int col = 0; col < 3; col++)
{
sb->Append(String::Format("{0,9}", results[col][row]));
total += results[col][row];
}
sb->AppendLine(String::Format("{0,9}", total));
}
Console::WriteLine(sb->ToString());
}
};
static array<String^>^ titles = {
"Enqueue ",
"TryEnqueue succeeded ",
"TryEnqueue failed ",
"TryEnqueue(T, wait) succeeded ",
"TryEnqueue(T, wait) failed ",
"Dequeue attempts ",
"Dequeue exceptions ",
"Remove operations ",
"Queue elements removed "};
enum class ThreadResultIndex
{
EnqueueCt,
TryEnqueueSucceedCt,
TryEnqueueFailCt,
TryEnqueueWaitSucceedCt,
TryEnqueueWaitFailCt,
DequeueCt,
DequeueExCt,
RemoveCt,
RemovedCt
};
public:
static void Demo()
{
Console::WriteLine("Working...");
for(int i = 0; i < 3; i++)
{
Thread^ t = gcnew Thread(gcnew ParameterizedThreadStart(Example::ThreadProc));
t->Start(i);
Interlocked::Increment(threadsRunning);
}
};
};
void main()
{
Example::Demo();
}
/* This example produces output similar to the following:
Working...
Thread 1 Thread 2 Thread 3 Total
Enqueue 274718 513514 337895 1126127
TryEnqueue succeeded 274502 513516 337480 1125498
TryEnqueue failed 119 235 141 495
TryEnqueue(T, wait) succeeded 274552 513116 338532 1126200
TryEnqueue(T, wait) failed 0 1 0 1
Dequeue attempts 824038 1541866 1015006 3380910
Dequeue exceptions 12828 23416 14799 51043
Remove operations 68746 128218 84306 281270
Queue elements removed 11464 22024 14470 47958
Queue elements removed 2921 4690 2982 10593
*/
using System;
using System.Threading;
using System.Collections.Generic;
using System.Text;
class SafeQueue<T>
{
// A queue that is protected by Monitor.
private Queue<T> m_inputQueue = new Queue<T>();
// Lock the queue and add an element.
public void Enqueue(T qValue)
{
// Request the lock, and block until it is obtained.
Monitor.Enter(m_inputQueue);
try
{
// When the lock is obtained, add an element.
m_inputQueue.Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
}
// Try to add an element to the queue: Add the element to the queue
// only if the lock is immediately available.
public bool TryEnqueue(T qValue)
{
// Request the lock.
if (Monitor.TryEnter(m_inputQueue))
{
try
{
m_inputQueue.Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
return true;
}
else
{
return false;
}
}
// Try to add an element to the queue: Add the element to the queue
// only if the lock becomes available during the specified time
// interval.
public bool TryEnqueue(T qValue, int waitTime)
{
// Request the lock.
if (Monitor.TryEnter(m_inputQueue, waitTime))
{
try
{
m_inputQueue.Enqueue(qValue);
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
return true;
}
else
{
return false;
}
}
// Lock the queue and dequeue an element.
public T Dequeue()
{
T retval;
// Request the lock, and block until it is obtained.
Monitor.Enter(m_inputQueue);
try
{
// When the lock is obtained, dequeue an element.
retval = m_inputQueue.Dequeue();
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
return retval;
}
// Delete all elements that equal the given object.
public int Remove(T qValue)
{
int removedCt = 0;
// Wait until the lock is available and lock the queue.
Monitor.Enter(m_inputQueue);
try
{
int counter = m_inputQueue.Count;
while (counter > 0)
// Check each element.
{
T elem = m_inputQueue.Dequeue();
if (!elem.Equals(qValue))
{
m_inputQueue.Enqueue(elem);
}
else
{
// Keep a count of items removed.
removedCt += 1;
}
counter = counter - 1;
}
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
return removedCt;
}
// Print all queue elements.
public string PrintAllElements()
{
StringBuilder output = new StringBuilder();
// Lock the queue.
Monitor.Enter(m_inputQueue);
try
{
foreach( T elem in m_inputQueue )
{
// Print the next element.
output.AppendLine(elem.ToString());
}
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(m_inputQueue);
}
return output.ToString();
}
}
public class Example
{
private static SafeQueue<int> q = new SafeQueue<int>();
private static int threadsRunning = 0;
private static int[][] results = new int[3][];
static void Main()
{
Console.WriteLine("Working...");
for(int i = 0; i < 3; i++)
{
Thread t = new Thread(ThreadProc);
t.Start(i);
Interlocked.Increment(ref threadsRunning);
}
}
private static void ThreadProc(object state)
{
DateTime finish = DateTime.Now.AddSeconds(10);
Random rand = new Random();
int[] result = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
int threadNum = (int) state;
while (DateTime.Now < finish)
{
int what = rand.Next(250);
int how = rand.Next(100);
if (how < 16)
{
q.Enqueue(what);
result[(int)ThreadResultIndex.EnqueueCt] += 1;
}
else if (how < 32)
{
if (q.TryEnqueue(what))
{
result[(int)ThreadResultIndex.TryEnqueueSucceedCt] += 1;
}
else
{
result[(int)ThreadResultIndex.TryEnqueueFailCt] += 1;
}
}
else if (how < 48)
{
// Even a very small wait significantly increases the success
// rate of the conditional enqueue operation.
if (q.TryEnqueue(what, 10))
{
result[(int)ThreadResultIndex.TryEnqueueWaitSucceedCt] += 1;
}
else
{
result[(int)ThreadResultIndex.TryEnqueueWaitFailCt] += 1;
}
}
else if (how < 96)
{
result[(int)ThreadResultIndex.DequeueCt] += 1;
try
{
q.Dequeue();
}
catch
{
result[(int)ThreadResultIndex.DequeueExCt] += 1;
}
}
else
{
result[(int)ThreadResultIndex.RemoveCt] += 1;
result[(int)ThreadResultIndex.RemovedCt] += q.Remove(what);
}
}
results[threadNum] = result;
if (0 == Interlocked.Decrement(ref threadsRunning))
{
StringBuilder sb = new StringBuilder(
" Thread 1 Thread 2 Thread 3 Total\n");
for(int row = 0; row < 9; row++)
{
int total = 0;
sb.Append(titles[row]);
for(int col = 0; col < 3; col++)
{
sb.Append(String.Format("{0,9}", results[col][row]));
total += results[col][row];
}
sb.AppendLine(String.Format("{0,9}", total));
}
Console.WriteLine(sb.ToString());
}
}
private static string[] titles = {
"Enqueue ",
"TryEnqueue succeeded ",
"TryEnqueue failed ",
"TryEnqueue(T, wait) succeeded ",
"TryEnqueue(T, wait) failed ",
"Dequeue attempts ",
"Dequeue exceptions ",
"Remove operations ",
"Queue elements removed "};
private enum ThreadResultIndex
{
EnqueueCt,
TryEnqueueSucceedCt,
TryEnqueueFailCt,
TryEnqueueWaitSucceedCt,
TryEnqueueWaitFailCt,
DequeueCt,
DequeueExCt,
RemoveCt,
RemovedCt
};
}
/* This example produces output similar to the following:
Working...
Thread 1 Thread 2 Thread 3 Total
Enqueue 277382 515209 308464 1101055
TryEnqueue succeeded 276873 514621 308099 1099593
TryEnqueue failed 109 181 134 424
TryEnqueue(T, wait) succeeded 276913 514434 307607 1098954
TryEnqueue(T, wait) failed 2 0 0 2
Dequeue attempts 830980 1544081 924164 3299225
Dequeue exceptions 12102 21589 13539 47230
Remove operations 69550 129479 77351 276380
Queue elements removed 11957 22572 13043 47572
*/
Imports System.Threading
Imports System.Collections.Generic
Imports System.Text
Class SafeQueue(Of T)
' A queue that is protected by Monitor.
Private m_inputQueue As New Queue(Of T)
' Lock the queue and add an element.
Public Sub Enqueue(ByVal qValue As T)
' Request the lock, and block until it is obtained.
Monitor.Enter(m_inputQueue)
Try
' When the lock is obtained, add an element.
m_inputQueue.Enqueue(qValue)
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
End Sub
' Try to add an element to the queue: Add the element to the queue
' only if the lock is immediately available.
Public Function TryEnqueue(ByVal qValue As T) As Boolean
' Request the lock.
If Monitor.TryEnter(m_inputQueue) Then
Try
m_inputQueue.Enqueue(qValue)
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
Return True
Else
Return False
End If
End Function
' Try to add an element to the queue: Add the element to the queue
' only if the lock becomes available during the specified time
' interval.
Public Function TryEnqueue(ByVal qValue As T, ByVal waitTime As Integer) As Boolean
' Request the lock.
If Monitor.TryEnter(m_inputQueue, waitTime) Then
Try
m_inputQueue.Enqueue(qValue)
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
Return True
Else
Return False
End If
End Function
' Lock the queue and dequeue an element.
Public Function Dequeue() As T
Dim retval As T
' Request the lock, and block until it is obtained.
Monitor.Enter(m_inputQueue)
Try
' When the lock is obtained, dequeue an element.
retval = m_inputQueue.Dequeue()
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
Return retval
End Function
' Delete all elements that equal the given object.
Public Function Remove(ByVal qValue As T) As Integer
Dim removedCt As Integer = 0
' Wait until the lock is available and lock the queue.
Monitor.Enter(m_inputQueue)
Try
Dim counter As Integer = m_inputQueue.Count
While (counter > 0)
'Check each element.
Dim elem As T = m_inputQueue.Dequeue()
If Not elem.Equals(qValue) Then
m_inputQueue.Enqueue(elem)
Else
' Keep a count of items removed.
removedCt += 1
End If
counter = counter - 1
End While
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
Return removedCt
End Function
' Print all queue elements.
Public Function PrintAllElements() As String
Dim output As New StringBuilder()
'Lock the queue.
Monitor.Enter(m_inputQueue)
Try
For Each elem As T In m_inputQueue
' Print the next element.
output.AppendLine(elem.ToString())
Next
Finally
' Ensure that the lock is released.
Monitor.Exit(m_inputQueue)
End Try
Return output.ToString()
End Function
End Class
Public Class Example
Private Shared q As New SafeQueue(Of Integer)
Private Shared threadsRunning As Integer = 0
Private Shared results(2)() As Integer
Friend Shared Sub Main()
Console.WriteLine("Working...")
For i As Integer = 0 To 2
Dim t As New Thread(AddressOf ThreadProc)
t.Start(i)
Interlocked.Increment(threadsRunning)
Next i
End Sub
Private Shared Sub ThreadProc(ByVal state As Object)
Dim finish As DateTime = DateTime.Now.AddSeconds(10)
Dim rand As New Random()
Dim result() As Integer = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
Dim threadNum As Integer = CInt(state)
While (DateTime.Now < finish)
Dim what As Integer = rand.Next(250)
Dim how As Integer = rand.Next(100)
If how < 16 Then
q.Enqueue(what)
result(ThreadResultIndex.EnqueueCt) += 1
Else If how < 32 Then
If q.TryEnqueue(what)
result(ThreadResultIndex.TryEnqueueSucceedCt) += 1
Else
result(ThreadResultIndex.TryEnqueueFailCt) += 1
End If
Else If how < 48 Then
' Even a very small wait significantly increases the success
' rate of the conditional enqueue operation.
If q.TryEnqueue(what, 10)
result(ThreadResultIndex.TryEnqueueWaitSucceedCt) += 1
Else
result(ThreadResultIndex.TryEnqueueWaitFailCt) += 1
End If
Else If how < 96 Then
result(ThreadResultIndex.DequeueCt) += 1
Try
q.Dequeue()
Catch
result(ThreadResultIndex.DequeueExCt) += 1
End Try
Else
result(ThreadResultIndex.RemoveCt) += 1
result(ThreadResultIndex.RemovedCt) += q.Remove(what)
End If
End While
results(threadNum) = result
If 0 = Interlocked.Decrement(threadsRunning) Then
Dim sb As New StringBuilder( _
" Thread 1 Thread 2 Thread 3 Total" & vbLf)
For row As Integer = 0 To 8
Dim total As Integer = 0
sb.Append(titles(row))
For col As Integer = 0 To 2
sb.Append(String.Format("{0,9}", results(col)(row)))
total += results(col)(row)
Next col
sb.AppendLine(String.Format("{0,9}", total))
Next row
Console.WriteLine(sb.ToString())
End If
End Sub
Private Shared titles() As String = { _
"Enqueue ", _
"TryEnqueue succeeded ", _
"TryEnqueue failed ", _
"TryEnqueue(T, wait) succeeded ", _
"TryEnqueue(T, wait) failed ", _
"Dequeue attempts ", _
"Dequeue exceptions ", _
"Remove operations ", _
"Queue elements removed " _
}
Private Enum ThreadResultIndex
EnqueueCt
TryEnqueueSucceedCt
TryEnqueueFailCt
TryEnqueueWaitSucceedCt
TryEnqueueWaitFailCt
DequeueCt
DequeueExCt
RemoveCt
RemovedCt
End Enum
End Class
' This example produces output similar to the following:
'
'Working...
' Thread 1 Thread 2 Thread 3 Total
'Enqueue 294357 512164 302838 1109359
'TryEnqueue succeeded 294486 512403 303117 1110006
'TryEnqueue failed 108 234 127 469
'TryEnqueue(T, wait) succeeded 294259 512796 302556 1109611
'TryEnqueue(T, wait) failed 1 1 1 3
'Dequeue attempts 882266 1537993 907795 3328054
'Dequeue exceptions 12691 21474 13480 47645
'Remove operations 74059 128715 76187 278961
'Queue elements removed 12667 22606 13219 48492
備註
使用 Enter 取得 Monitor 傳遞為 參數之 物件的 。 如果另一個執行緒已在 Enter 物件上執行 ，但尚未執行對應的 Exit ，則目前的執行緒將會封鎖，直到其他執行緒釋放物件為止。 相同的執行緒在不封鎖的情況下叫 Enter 用多次是合法的;不過，必須先叫用相同數目的 Exit 呼叫，才能解除封鎖其他等候物件的執行緒。
使用 Monitor (鎖定物件，也就是參考型別) ，而非實值型別。 當您將實值型別變數傳遞至 Enter 時，它會以 物件的形式進行 Box 處理。 如果您再次將相同的變數傳遞至 Enter ，則會以個別物件的形式進行 Box 處理，而且執行緒不會封鎖。 在此情況下，應該保護的程式碼 Monitor 不會受到保護。 此外，當您將變數傳遞至 Exit 時，仍會建立另一個不同的物件。 因為傳遞至 Exit 的物件與傳遞至 Enter 的物件不同， Monitor 所以 會擲回 SynchronizationLockException 。 如需詳細資訊，請參閱 監視概念主題。
Interrupt 可以中斷等候在 物件上輸入 Monitor 的執行緒。
ThreadInterruptedException將會擲回 。
使用 C# try ...
finallyblock (Try ... Finally in Visual Basic) ，以確保您釋放監視器，或使用 Visual Basic) 中的 C# lock 語句 (SyncLock 語句，這會將 和 Exit 方法包裝 Enter 在 try ...
finally 塊。
另請參閱
適用於
Enter(Object, Boolean)
取得指定之物件的獨佔鎖定，並且完整設定值，指出是否採用鎖定。
public:
static void Enter(System::Object ^ obj, bool % lockTaken);public static void Enter (object obj, ref bool lockTaken);static member Enter : obj * bool -> unitPublic Shared Sub Enter (obj As Object, ByRef lockTaken As Boolean)參數
- obj
- Object
要等候的物件。
- lockTaken
- Boolean
嘗試取得鎖定的結果 (以傳址方式傳遞)。 輸入必須是 false。 如果已取得鎖定，輸出就是 true；否則輸出為 false。 嘗試取得鎖定期間，即使發生例外狀況，仍然會設定輸出。
注意 如果沒有發生例外狀況，這個方法的輸出一律 true 為 。
例外狀況
lockTaken 的輸入為 true。
obj 參數為 null。
範例
下列程式碼顯示使用 Enter(Object, Boolean) 方法多載的基本模式。 即使方法擲回例外狀況，這個多載一律會設定在 Visual) lockTaken Basic 中傳遞至 ref 參數 (ByRef 的變數值，因此變數的值是測試是否必須釋放鎖定的可靠方式。
bool acquiredLock = false;
try
{
Monitor.Enter(lockObject, ref acquiredLock);
// Code that accesses resources that are protected by the lock.
}
finally
{
if (acquiredLock)
{
Monitor.Exit(lockObject);
}
}
Dim acquiredLock As Boolean = False
Try
Monitor.Enter(lockObject, acquiredLock)
' Code that accesses resources that are protected by the lock.
Finally
If acquiredLock Then
Monitor.Exit(lockObject)
End If
End Try
備註
使用 Enter 取得 Monitor 傳遞為 obj 參數之 物件的 。 如果另一個執行緒已在 Enter 物件上執行 ，但尚未執行對應的 Exit ，則目前的執行緒將會封鎖，直到其他執行緒釋放物件為止。 相同的執行緒在不封鎖的情況下叫 Enter 用多次是合法的;不過，必須先叫用相同數目的 Exit 呼叫，才能解除封鎖其他等候物件的執行緒。
如果因為擲回例外狀況而未取得鎖定，則為 lockTaken 參數指定的變數會在 false 此方法結束時。 這可讓程式在所有情況下判斷是否需要釋放鎖定。 如果這個方法傳回而不擲回例外狀況，則為 lockTaken 參數指定的變數一律 true 為 ，而且不需要測試它。
使用 Monitor (鎖定物件，也就是參考型別) ，而非實值型別。 當您將實值型別變數傳遞至 Enter 時，它會以 物件的形式進行 Box 處理。 如果您再次將相同的變數傳遞至 Enter ，則會以個別物件的形式進行 Box 處理，而且執行緒不會封鎖。 在此情況下，應該保護的程式碼 Monitor 不會受到保護。 此外，當您將變數傳遞至 Exit 時，會建立另一個不同的物件。 因為傳遞至 Exit 的物件與傳遞至 Enter 的物件不同， Monitor 所以 會擲回 SynchronizationLockException 。 如需詳細資訊，請參閱 監視概念主題。
Interrupt 可以中斷等候在 物件上輸入 Monitor 的執行緒。
ThreadInterruptedException將會擲回 。
