Classe Timeout
Assembly: mscorlib (in mscorlib.dll)
L'unico membro di questa classe, Infinite, è una costante utilizzata dai metodi che accettano un parametro timeout integer, ad esempio i metodi Thread.Sleep(Int32), Thread.Join(Int32) e ReaderWriterLock.AcquireReaderLock(Int32).
Nell'esempio di codice riportato di seguito viene illustrato un thread sospeso per un tempo indeterminato e poi riattivato.
using System; using System.Security.Permissions; using System.Threading; [assembly: SecurityPermissionAttribute(SecurityAction.RequestMinimum, ControlThread = true)] class ThreadInterrupt { static void Main() { StayAwake stayAwake = new StayAwake(); Thread newThread = new Thread(new ThreadStart(stayAwake.ThreadMethod)); newThread.Start(); // The following line causes an exception to be thrown // in ThreadMethod if newThread is currently blocked // or becomes blocked in the future. newThread.Interrupt(); Console.WriteLine("Main thread calls Interrupt on newThread."); // Tell newThread to go to sleep. stayAwake.SleepSwitch = true; // Wait for newThread to end. newThread.Join(); } } class StayAwake { bool sleepSwitch = false; public bool SleepSwitch { set{ sleepSwitch = value; } } public StayAwake(){} public void ThreadMethod() { Console.WriteLine("newThread is executing ThreadMethod."); while(!sleepSwitch) { // Use SpinWait instead of Sleep to demonstrate the // effect of calling Interrupt on a running thread. Thread.SpinWait(10000000); } try { Console.WriteLine("newThread going to sleep."); // When newThread goes to sleep, it is immediately // woken up by a ThreadInterruptedException. Thread.Sleep(Timeout.Infinite); } catch(ThreadInterruptedException e) { Console.WriteLine("newThread cannot go to sleep - " + "interrupted by main thread."); } } }
import System.*;
import System.Security.Permissions.*;
import System.Threading.*;
import System.Threading.Thread;
/** @assembly SecurityPermissionAttribute(SecurityAction.RequestMinimum,
ControlThread = true)
*/
class ThreadInterrupt
{
public static void main(String[] args)
{
StayAwake stayAwake = new StayAwake();
Thread newThread = new Thread(new ThreadStart(stayAwake.ThreadMethod));
newThread.Start();
// The following line causes an exception to be thrown
// in ThreadMethod if newThread is currently blocked
// or becomes blocked in the future.
newThread.Interrupt();
Console.WriteLine("Main thread calls Interrupt on newThread.");
// Tell newThread to go to sleep.
stayAwake.set_SleepSwitch(true);
// Wait for newThread to end.
newThread.Join();
} //main
} //ThredInterrupt
class StayAwake
{
private boolean sleepSwitch = false;
/** @property
*/
public void set_SleepSwitch(boolean value)
{
sleepSwitch = value;
} //set_SleepSwitch
public StayAwake()
{
} //StayAwake
public void ThreadMethod()
{
Console.WriteLine("newThread is executing ThreadMethod.");
while (!(sleepSwitch)) {
// Use SpinWait instead of Sleep to demonstrate the
// effect of calling Interrupt on a running thread.
Thread.SpinWait(10000000);
}
try {
Console.WriteLine("newThread going to sleep.");
// When newThread goes to sleep, it is immediately
// woken up by a ThreadInterruptedException.
Thread.Sleep(Timeout.Infinite);
}
catch (ThreadInterruptedException e) {
Console.WriteLine(("newThread cannot go to sleep - "
+ "nterrupted by main thread."));
}
} //ThreadMethod
} //StayAwake
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile per Pocket PC, Windows Mobile per Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework non supporta tutte le versioni di ciascuna piattaforma. Per un elenco delle versioni supportate, vedere Requisiti di sistema.