Lock statement in multithreading

Nageshwar Rao

10y937Learn iOS Programming

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

2 Replies

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Farhan Shariff10y ago
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 < 5; 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 < 3; i++)
{
Threads[i] = new Thread(new ThreadStart(PrintNumbers));
Threads[i].Name = "Child " + i;
}

foreach (Thread t in Threads)
t.Start();
Console.ReadLine();
}
}
}
Avikshith Aradhya10y ago
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.