synchronized Questions
4
Solved
private double value;
public synchronized void setValue(double value) {
this.value = value;
}
public double getValue() {
return this.value;
}
In the above example is there any point in making ...
Weltpolitik asked 12/7, 2012 at 19:50
2
How do I synchronize access of a property that uses didSet (using GCD or objc_sync_enter)?
I have a property that has a property observer. How can I use a private queue to synchronize get/set of t...
Riehl asked 17/5, 2017 at 5:5
4
I came across a code like this
synchronized(obj) {
obj = new Object();
}
Something does not feel right about this , I am unable to explain, Is this piece of code OK or there is something rea...
Baynebridge asked 15/7, 2011 at 18:51
4
Solved
On my server I call two emits at the same time, which looks like this.
if (songs.length > 0) {
socket.emit('data loaded', songs);
socket.broadcast.to(opponent).emit('data loaded', songs)...
Quality asked 25/12, 2016 at 10:52
1
Solved
Here is the code I've stumbled across:
class TransactionContextHolder {
private static final ThreadLocal<TransactionContext> currentTransactionContext = new NamedInheritableThreadLocal<T...
Incardination asked 25/12, 2016 at 18:40
3
Solved
If I want to ensure exclusive access to an object in Java, I can write something like this:
...
Zoo zoo = findZoo();
synchronized(zoo)
{
zoo.feedAllTheAnimals();
...
}
Is there a way to ...
Leprosy asked 26/5, 2011 at 9:37
4
Solved
Let's say I have an object as follows:
Map<String, String> m = new HashMap<>();
Then I synchronize on this object as follows and change its reference:
synchronize(m){
m = new HashM...
Pilcher asked 17/11, 2016 at 2:19
3
Solved
In a nice article with some concurrency tips, an example was optimized to the following lines:
double getBalance() {
Account acct = verify(name, password);
synchronized(acct) { return acct.balan...
Kisumu asked 23/6, 2010 at 15:45
6
Solved
What is the difference between a synchronized method and synchronized block in Java ?
I have been searching the answer on the Net, people seem to be so unsure about this one :-(
My take wou...
Retaliate asked 19/7, 2009 at 13:45
6
Solved
If I just use synchronized, not the wait/notify methods, will it still be thread-safe?
What's the difference?
Selffulfillment asked 20/10, 2011 at 21:6
2
I've wrote some multithreading code in java and synchronized method that changed variable, but it doesn't synchronized my code, I still get random values. There is my code:
public class Main {
pu...
Hollington asked 14/8, 2016 at 6:47
6
Solved
I have always thought that synchronizing the run method in a java class which implements Runnable is redundant. I am trying to figure out why people do this:
public class ThreadedClass implements ...
Twentyone asked 5/9, 2011 at 23:47
3
Solved
To force cancel AsyncTask shouldn't the flag periodically checked in doInBackground be volatile?
I want to force cancel AsyncTask. I see that you can use isCancelled() like in this valid solution (which under the hood uses AtomicBoolean.
But I see solutions like suspiciousSolution1, suspiciou...
Touristy asked 15/7, 2016 at 9:32
8
Solved
A warning is showing every time I synchronize on a non-final class field. Here is the code:
public class X
{
private Object o;
public void setO(Object o)
{
this.o = o;
}
public voi...
Newmann asked 2/8, 2011 at 10:44
3
Solved
I'm using EclEmma for coverage analysis.
My Java code includes a synchronized(MyClass.class) {} block.
EclEmma says it is only partially covered, event though I've got a unit test in which one th...
Necessitous asked 15/9, 2010 at 6:34
3
I'm trying to synchronize my Person class Methods so that my static counter variable gets decremented by one thread at the a time.
public class Person extends Thread {
private static int count ...
Aarhus asked 20/4, 2016 at 19:10
3
Solved
my problem is that:
search_text.addModifyListener(new ModifyListener() {
@Override
public void modifyText(ModifyEvent e) {
ArrayList<Object> GPDMvalue = (ArrayList<Object>) multiSor...
Treed asked 1/8, 2014 at 1:38
1
Solved
Let's imagine the next piece of Kotlin code that performs some query to a database by means a JDBC connector:
var results : ResultSet
preparedStatement.clearParameters()
preparedStatement.setIn...
Palmieri asked 27/3, 2016 at 10:51
1
I have a singleton factory (edit: renamed "loader" to avoid confusion with factory pattern) that creates objects (in my example DAOs) or returns them if already created:
public class DAOLoader {
...
Chew asked 29/2, 2016 at 18:45
4
Solved
I have 4 methods (m1, m2, m3 and m4) in a class. Method m1, m2 and m3 are synchronized methods. Also, I have 4 threads t1, t2, t3 and t4 respectively.
If t1 access the m1 method (synchronized meth...
Trademark asked 1/7, 2010 at 17:6
6
I'm trying to learn about threads and synchronization. I made this test program:
public class Test {
static List<Thread> al = new ArrayList<>();
public static void main(String[] arg...
Pedigree asked 9/2, 2016 at 21:51
1
I try to prove that synchronized is slower when there are many readers and only some writers. Somehow I proved the opposite.
The RW example, time of execution is 313 ms:
package zad3readWriteLock...
Cleat asked 5/1, 2016 at 11:52
1
Solved
I decided to dig into source code a bit and noticed that Collections.synchronizedList(List) is implemented as follows:
public static <T> List<T> synchronizedList(List<T> list) {
...
Anagnos asked 4/1, 2016 at 7:16
4
Solved
There is something i haven't yet understand about synchronized and volatile.
I understand that a thread can safe changes locally. From what i have read so far is that synchronized > volatile.
Say...
Isocyanide asked 30/12, 2015 at 10:32
3
Say I have such a method:
synchronized void incrementIndex() {
index++;
}
I want to unit test this method to see whether index's final value is set correctly if multiple threads simultaneously ...
Kimber asked 17/11, 2014 at 6:47
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