Thread Synchronization

[sachin]

Hi everyone,
I have following code ::

case 1:
public class Resource {
public synchronized void met1()
{ }
public void met2() { }
}
And three threads t1,t2,t3.If thread t1 is using met1() can other
threads t2 ,t3 can use met2() at same time ??

case 2:
Also if the met1() is changed to
public static
synchronized void met1() { }
Can t2,t3 access met2() if t1 is using met1() at same time?

 

[Ingo R. Homann]

Hi,

Hi everyone,
I have following code ::

case 1:
public class Resource {
public synchronized void met1()
{ }
public void met2() { }
}
And three threads t1,t2,t3.If thread t1 is using met1() can other
threads t2 ,t3 can use met2() at same time ??
Yes.

case 2:
Also if the met1() is changed to
public static
synchronized void met1() { }
Can t2,t3 access met2() if t1 is using met1() at same time?

Yes.

Please read a book!

Ciao,
Ingo

 

[Tom Hawtin]

public class Resource {
public synchronized void met1()
{ }
public void met2() { }
}
And three threads t1,t2,t3.If thread t1 is using met1() can other
threads t2 ,t3 can use met2() at same time ??

The key concept is that

synchronized void fn() {
...
}

is just a short form of

void fn() {
synchronized (this) {
...
}
}

You just need to keep your eye on which instance you are synchronising on.

Tom Hawtin