Lock statement in multithreading

Question

Hi i want to know about Lock statement in multithreading and also deadlock

Avikshith Aradhya · Answer

Lock keyword make sure to mark a statement block as a critical section, by obtaining the mutual-exclusion lock for a given object.The lock keyword make sure that one thread does not enter a critical section of code while another thread is in the critical section. if any other Thread what that section of code it will wait or blocked until the object is released after completion of task. Thread Lock can be implemented with the " lock " keyword. Deadlock is the situation when two or more processes are each waiting for another to release the resource in a circular chain.Below image explain more about Deadlock, Both processes need resources to continue execution. P1 requires additional resource R1 and is in possession of resource R2, P2 requires additional resource R2 and is in possession of R1; neither process can continue and this situation is called Deadlock.

Farhan Shariff · Answer

This article might be helpful for deadlock simple good article about mutex http://www.c-sharpcorner.com/UploadFile/rajeshatkiit/mutex-in-net/ www.c-sharpcorner.com/UploadFile/1d42da/deadlock-in-threading-in-C-Sharp/ Here is an another example which might be helping in understanding the multithreadind lock concept namespace Monitor_Lock { class Program { static readonly object _object = new object(); public static void PrintNumbers() { Monitor.Enter(_object); try { for ( int i = 0; i { Thread.Sleep(100); Console.Write(i + "," ); } Console.WriteLine(); } finally { Monitor.Exit(_object); } } static void TestLock() { lock (_object) { Thread.Sleep(100); Console.WriteLine(Environment.TickCount); } } static void Main(string[] args) { Thread[] Threads = new Thread[3]; for ( int i = 0; i { Threads[i] = new Thread( new ThreadStart(PrintNumbers)); Threads[i].Name = "Child " + i; } foreach (Thread t in Threads) t.Start(); Console.ReadLine(); } } }

Lock statement in multithreading

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