स्थानीय चर पर लॉकिंग, लॉक जीता गया काम। वैश्विक चर पर लॉकिंग कई थ्रेड सिंक्रनाइज़ करने के लिए प्रभावी हो सकता है।
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
namespace testLock
{
class Program
{
public static void Main()
{
// Start a thread that calls a parameterized static method.
for(int i = 0; i< 10;i++)
{
Thread newThread = new Thread(DoWork);
newThread.Start(i);
}
Console.ReadLine();
}
static object gObject= new object();
public static void DoWork(object data)
{
int len = (int)data % 3;
object tmp = new object();
Console.WriteLine("to lock...... Data='{0}' sleepTime:{1}", data, len);
lock (tmp)//tmp won't work, change tmp to gObject to see different output, which is good locking case)
{
Console.WriteLine("in lock...... Data='{0}' sleepTime:{1}", data, len);
Thread.Sleep( len* 1000);
Console.WriteLine("Static thread procedure. Data='{0}' sleepTime:{1}", data, len);
}
}
}
}
**Lock temp variable,will output:**
to lock...... Data='1' sleepTime:1
in lock...... Data='1' sleepTime:1
to lock...... Data='2' sleepTime:2
in lock...... Data='2' sleepTime:2
to lock...... Data='0' sleepTime:0
in lock...... Data='0' sleepTime:0
Static thread procedure. Data='0' sleepTime:0
to lock...... Data='3' sleepTime:0
in lock...... Data='3' sleepTime:0
Static thread procedure. Data='3' sleepTime:0
to lock...... Data='4' sleepTime:1
in lock...... Data='4' sleepTime:1
to lock...... Data='5' sleepTime:2
in lock...... Data='5' sleepTime:2
to lock...... Data='6' sleepTime:0
in lock...... Data='6' sleepTime:0
Static thread procedure. Data='6' sleepTime:0
to lock...... Data='7' sleepTime:1
in lock...... Data='7' sleepTime:1
to lock...... Data='8' sleepTime:2
in lock...... Data='8' sleepTime:2
to lock...... Data='9' sleepTime:0
in lock...... Data='9' sleepTime:0
Static thread procedure. Data='9' sleepTime:0
Static thread procedure. Data='1' sleepTime:1
Static thread procedure. Data='4' sleepTime:1
Static thread procedure. Data='7' sleepTime:1
Static thread procedure. Data='2' sleepTime:2
Static thread procedure. Data='5' sleepTime:2
Static thread procedure. Data='8' sleepTime:2
**Then lock gObject, will print:**
to lock...... Data='0' sleepTime:0
in lock...... Data='0' sleepTime:0
to lock...... Data='1' sleepTime:1
to lock...... Data='2' sleepTime:2
Static thread procedure. Data='0' sleepTime:0
in lock...... Data='1' sleepTime:1
to lock...... Data='3' sleepTime:0
to lock...... Data='4' sleepTime:1
to lock...... Data='5' sleepTime:2
to lock...... Data='6' sleepTime:0
to lock...... Data='7' sleepTime:1
to lock...... Data='8' sleepTime:2
to lock...... Data='9' sleepTime:0
Static thread procedure. Data='1' sleepTime:1
in lock...... Data='5' sleepTime:2
Static thread procedure. Data='5' sleepTime:2
in lock...... Data='9' sleepTime:0
Static thread procedure. Data='9' sleepTime:0
in lock...... Data='2' sleepTime:2
Static thread procedure. Data='2' sleepTime:2
in lock...... Data='8' sleepTime:2
Static thread procedure. Data='8' sleepTime:2
in lock...... Data='7' sleepTime:1
Static thread procedure. Data='7' sleepTime:1
in lock...... Data='4' sleepTime:1
Static thread procedure. Data='4' sleepTime:1
in lock...... Data='3' sleepTime:0
Static thread procedure. Data='3' sleepTime:0
in lock...... Data='6' sleepTime:0
Static thread procedure. Data='6' sleepTime:0
यह स्थिर होना आवश्यक नहीं है। (जब तक कि एक अलग उदाहरण को लक्षित न किया जाए) –
इसे स्थैतिक रूप से पढ़ना इसे नुकसान नहीं पहुंचाता है, केवल इसे सुरक्षित करता है (भले ही इसकी आवश्यकता नहीं है) – Tilak
सहमत हैं। यह स्थिर होना जरूरी नहीं है। आप जो सुरक्षा कर रहे हैं उस पर निर्भर करता है। –