GCNotificationStatus 枚举
定义
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。
提供有关当前注册的信息，以通知下一次完整的垃圾回收。
public enum class GCNotificationStatuspublic enum GCNotificationStatus[System.Serializable]
public enum GCNotificationStatustype GCNotificationStatus = [<System.Serializable>]
type GCNotificationStatus = Public Enum GCNotificationStatus- 继承
- 属性
字段
| 名称 | 值 | 说明 |
|---|---|---|
| Succeeded | 0 | 通知成功，注册未取消。 |
| Failed | 1 | 通知因任何原因失败。 |
| Canceled | 2 | 当前注册已被用户取消。 |
| Timeout | 3 | 由任一参数 |
| NotApplicable | 4 | 如果垃圾回收通知没有当前注册，或者已执行完整 GC，但作为后台 GC（即，主要与用户线程并发运行的 GC）而不是完全阻止 GC，则此值可能会导致此值。 默认情况下启用后台 GC;禁用它可以提高预测准确性，但会导致更大的 GC 暂停。 |
示例
以下示例从GCNotificationStatus方法获取WaitForFullGCApproach枚举。 如果枚举返回“成功”，它将调用自定义方法 OnFullGCApproachNotify 来执行操作，以响应接近的完整垃圾回收。 此代码示例是针对 垃圾回收通知 主题提供的较大示例的一部分。
public static void WaitForFullGCProc()
{
while (true)
{
// CheckForNotify is set to true and false in Main.
while (checkForNotify)
{
// Check for a notification of an approaching collection.
GCNotificationStatus s = GC.WaitForFullGCApproach();
if (s == GCNotificationStatus.Succeeded)
{
Console.WriteLine("GC Notification raised.");
OnFullGCApproachNotify();
}
else if (s == GCNotificationStatus.Canceled)
{
Console.WriteLine("GC Notification cancelled.");
break;
}
else
{
// This can occur if a timeout period
// is specified for WaitForFullGCApproach(Timeout)
// or WaitForFullGCComplete(Timeout)
// and the time out period has elapsed.
Console.WriteLine("GC Notification not applicable.");
break;
}
// Check for a notification of a completed collection.
GCNotificationStatus status = GC.WaitForFullGCComplete();
if (status == GCNotificationStatus.Succeeded)
{
Console.WriteLine("GC Notification raised.");
OnFullGCCompleteEndNotify();
}
else if (status == GCNotificationStatus.Canceled)
{
Console.WriteLine("GC Notification cancelled.");
break;
}
else
{
// Could be a time out.
Console.WriteLine("GC Notification not applicable.");
break;
}
}
Thread.Sleep(500);
// FinalExit is set to true right before
// the main thread cancelled notification.
if (finalExit)
{
break;
}
}
}
let waitForFullGCProc () =
let mutable broken = false
while not broken do
let mutable broken = false
// CheckForNotify is set to true and false in Main.
while checkForNotify && not broken do
// Check for a notification of an approaching collection.
match GC.WaitForFullGCApproach() with
| GCNotificationStatus.Succeeded ->
printfn "GC Notification raised."
onFullGCApproachNotify ()
// Check for a notification of a completed collection.
match GC.WaitForFullGCComplete() with
| GCNotificationStatus.Succeeded ->
printfn "GC Notification raised."
onFullGCCompleteEndNotify ()
| GCNotificationStatus.Canceled ->
printfn "GC Notification cancelled."
broken <- true
| _ ->
// Could be a time out.
printfn "GC Notification not applicable."
broken <- true
| GCNotificationStatus.Canceled ->
printfn "GC Notification cancelled."
broken <- true
| _ ->
// This can occur if a timeout period
// is specified for WaitForFullGCApproach(Timeout)
// or WaitForFullGCComplete(Timeout)
// and the time out period has elapsed.
printfn "GC Notification not applicable."
broken <- true
Thread.Sleep 500
// FinalExit is set to true right before
// the main thread cancelled notification.
if finalExit then broken <- true
Public Shared Sub WaitForFullGCProc()
While True
' CheckForNotify is set to true and false in Main.
While checkForNotify
' Check for a notification of an approaching collection.
Dim s As GCNotificationStatus = GC.WaitForFullGCApproach
If (s = GCNotificationStatus.Succeeded) Then
Console.WriteLine("GC Notification raised.")
OnFullGCApproachNotify()
ElseIf (s = GCNotificationStatus.Canceled) Then
Console.WriteLine("GC Notification cancelled.")
Exit While
Else
' This can occur if a timeout period
' is specified for WaitForFullGCApproach(Timeout)
' or WaitForFullGCComplete(Timeout)
' and the time out period has elapsed.
Console.WriteLine("GC Notification not applicable.")
Exit While
End If
' Check for a notification of a completed collection.
s = GC.WaitForFullGCComplete
If (s = GCNotificationStatus.Succeeded) Then
Console.WriteLine("GC Notifiction raised.")
OnFullGCCompleteEndNotify()
ElseIf (s = GCNotificationStatus.Canceled) Then
Console.WriteLine("GC Notification cancelled.")
Exit While
Else
' Could be a time out.
Console.WriteLine("GC Notification not applicable.")
Exit While
End If
End While
Thread.Sleep(500)
' FinalExit is set to true right before
' the main thread cancelled notification.
If finalExit Then
Exit While
End If
End While
End Sub
注解
RegisterForFullGCNotification使用此方法注册完整的垃圾回收通知。 WaitForFullGCApproach然后使用该方法或WaitForFullGCComplete方法返回GCNotificationStatus包含通知状态的枚举。
