All Questions
Tagged with java-threads synchronized
26 questions
-1
votes
1
answer
107
views
Java synchronization not working properly
I am trying to implement a custom HashMap for multithreading environment. Why is this giving inconsistent results? I think multiple threads are accessing the put method simultaneously.
class Main{
...
- 1
-1
votes
1
answer
336
views
Print numbers from one to ten
I have to print the numbers between one to ten , with ten threads and they got to be consecutive numbers.
I mean Thread0 - 10 print 1,1,1,1,1,1,1,1,1,1 then Thread 0-10 print 2,2,2,2,2,2,2,2,,2,2
...
0
votes
1
answer
39
views
Synchronized getter and synchronized thread run method in java
The followiing code uses threads to calculate the max value in a subarry, and then calculates the max value out of the max values the threads returned. I have a bug that the main thread doesn't wait ...
- 51
1
vote
1
answer
93
views
How does Object.notify() work with Object.wait()?
I am trying to track a resource which behaves in an asymmetric manner. That is, it responds immediately to a start() request, but finishes processing a cancel() request at a significant delay.
For ...
- 831
0
votes
1
answer
59
views
Where does the program know the exact value of the instance variable if I don't use synchronized in Java?
I'm learning about Java multithreading and I'm doing some simple tests with synchronized blocks and without synchronized block.
public class MultipleMonitorObjects {
private Object monitor1 = new ...
- 1,238
1
vote
1
answer
216
views
How to check for changes in a List in java?
I have a question, I want to know if it's possible to check continuously for adds to a list.
I have a node with a file to transfer, I connect it to a directory.
I have another node without the file ...
- 93
1
vote
1
answer
507
views
My java unit test failed if there is a call to wait method inside a synchronized method
I am learning multi-threads programming in java recently. And I don't understand why the following test case will fail. Any explanation will be much appreciated.
Here is MyCounter.java.
public class ...
- 13
0
votes
1
answer
145
views
Does Java also guarantee that all variable changes before synchronized will be visible to the next thread which synchronizes on same object?
In the below code will Java ensure that latest copy of a is visible to the thread which calls getAB()?
I understand that the values returned by getAB() might not be the same as set by setAB, but will ...
- 638
2
votes
2
answers
151
views
Java multithreading :Start 2 threads, print 1-100 by turns. result like this: but it is not running [duplicate]
Two threads needs to print in this order-
Thread1:0
Thread2:::0
Thread1:1
Thread2:::1
Thread1:2
Thread2:::2
Thread1:3
Thread2:::3
Thread1:::4
Thread2:::4
.
. ...
- 21
0
votes
2
answers
168
views
Need code to understand synchronized static and non-static methods being accessed at the same time by two different threads on the same instance
class A
{
synchronized static void m1()
{
System.out.println("In m1 A");
}
synchronized void m2()
{
System.out.println("In m2 A");
}
}
...
- 31
4
votes
1
answer
796
views
Creating an object from string and using as monitor in synchronized block [duplicate]
I am using an annotation on some classes and by reflection I get some string of that annotation which is unique for every class.
I am thinking of using that string to synchronize a block of code, but ...
- 93
0
votes
1
answer
746
views
sleep() and context switching in java threads
Lets assume a situation like this :
Lets say Thread0 access the lockObject first and then Thread0 going to sleep for 1000ms.
synchronized(lockObject) {
Thread0.sleep(1000);
}
Thread1 also ...
- 101
1
vote
1
answer
706
views
understanding synchronizedlist in java
I having an ArrayList which is modified by one thread and read by another.
Reading thread is happy to read whatever is left in the list after modification. It should stop when all the items are ...
- 1,154
0
votes
1
answer
464
views
static method with a synchronized block inside, blocks the entire class in java?
I have a class that executes 3 threads, and on every thread I ask and check on the global variables. I´m trying to lock each variable separetly, I dont´t want to block the entire class every time I ...
- 99
0
votes
2
answers
1k
views
How to make a circular queue completely thread safe
At the minute I have just added synchronized to the majority of methods as it appears that without it, these methods with not be thread safe. Is there anything else that I need to implement to ensure ...
- 399