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Hi all, i wanna ask you the difference about this one :

C#

// 1
oThread1 = new (Method1);
oThread2 = new (Method2);
oThread3 = new (Method3);

oThread1.Start(obj);
oThread2.Start(obj);
oThread3.Start(obj);

C#

// 2
oThread1 = new (Method1);
oThread2 = new (Method2);
oThread3 = new (Method3);

oThread1.Start(obj);
oThread2.Start(obj);
oThread3.Start(obj);

oThread1.Join();
oThread2.Join();
oThread3.Join();

And would u tell me the mechanism of each other (process), so it can show me the difference... :~
Thank you.

Posted 30-Aug-10 20:38pm

Teamsar Muliadi

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Al-Farooque Shubho · Accepted Answer · 2010-08-30T20:45:00

If the Main thread spawns a child thread, the child thread is killed as soon as the main thread is killed. So, if your child thread requires 10 seconds to execute, and, if your main thread completes execution within 5 seconds, the main thread will be killed and your child thread will be killed immediately no matter whether it is completed or not. You obviously don't want that to happen.

So, you would like your main thread to wait until your child thread completes execution.

If you call childThread.Join(), your main thread waits until the childThread completes it's execution.

So, I think you already understood the difference between these two options you provided :)

AspDotNetDev · Accepted Answer · 2010-08-30T20:44:00

Solution 1

Not sure that syntax is correct, but the difference is the three Join methods called on the threads in the second code block. A Join will wait for that thread to complete processing before allowing the current thread to proceed. So, it will wait for thread 1, then 2, then 3 to finish. Though all three threads may be running at once, so once the current thread finishes waiting for thread 1 to complete, it may just pass straight through the second and third threads (because they may already be done).

Posted 30-Aug-10 20:44pm

AspDotNetDev

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Teamsar Muliadi 31-Aug-10 3:12am

Mmm.. but, how about in the first case ??

AspDotNetDev 31-Aug-10 3:20am

The current thread will not wait for the other three threads to execute. In essence, 4 threads will be running at once, with each of them ending at some point or another (not necessarily at the same time). That means that whatever processing that occurs after oThread3.Start(obj); will execute at the same time the code in threads 1-3 execute. Depending on if those 3 threads are background threads, they may exit prematurely if the current thread executes before they finish (supposing the current thread is the main application thread).

Teamsar Muliadi 31-Aug-10 3:27am

Ok.. :) thank you aspdotnetdev.. :)