ReentrantLock is a Java mutex class.
A 'reentrant lock' is a lock that can be re-acquired by the current owner without blocking or deadlock. Java provides an implementation.
Questions tagged [reentrantlock]
230 questions
0
votes
1 answer
Is using ReentrantLock reliable as synchronized?
I searched a lot but was confused with the process of 'ReentrantLock' and normal 'synchronized' .
For example(1):
Object obj = new Object();
synchronized(obj){
//lock is guaranteed to be acquired
}
example(2)
Lock lock = new…
ak500
- 33
- 4
0
votes
5 answers
Reetrant locks in java
I am new to Multi Threading in java. I was trying to use locks.Here is my code sample.
package com;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import…
Gaurang Agarwal
- 66
- 7
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votes
1 answer
On what object Reentrant lock aquire lock on?
Hello I have question about ReentrantLocks in Concurrent package.
//First
Object ob = new Object();
synchronized(ob){
}
//Second
Lock lock = new ReentrantLock();
lock.lock();
try{
}
finally{
lock.unlock();
}
It says both Pieces of code are…
Lakshitha Ranasinghe
- 548
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0
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0 answers
Java ReentrantLock issue
Hello I'm having some issues regarding Lock's implementation: ReentrantLock. I'm using a singleton cache inside Spring 3.0(web). However when I open several browser tabs at the exact same time, all threads seem to lock, and I get several unnecesary…
delpo
- 210
- 2
- 18
0
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2 answers
Execution of threads in a queue in Java
I have this exercise:
Develop a multi-threaded application.
Use java.util.concurrent opportunities.
DONT USE: synchronized, BlockingQueue, BlockingDeque
All entities wishing to access a resource must be threads. Use the
opportunities of…
the_faceless
- 19
- 6
0
votes
1 answer
Benefits of using ReentrantLock over synchronized
I find out one more benefit of using ReentrantLock over synchronized
Below code shows even if exception occurs in critical section lock is released(Using ReentrantLock )
void someMethod() {
//get the lock before processing critical section.
…
Javed Solkar
- 162
- 11
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votes
1 answer
What's the benefit of having two ReentrantLock in a class?
If I have this code:
public class PrLock {
private Lock lock1= new ReentrantLock();
private Lock lock2= new ReentrantLock();
private int num=0;
public void addLock1(){
lock1.lock();
try {
num++;
…
gluckko
- 1
0
votes
2 answers
Java, Lock, Condition - Signal not waking waiting thread
I have a problem with which i am stuck for some hours and I don't really know how to solve it. It's quite simple - i have some threads, one of them needs to wait for signal from the other one. Somehow, even if I make signal on a condition... nothing…
Bóg Programowania
- 63
- 8
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0 answers
Avoiding multiple lock attempts java
I have the following method:
public foo bar(String id) {
Lock localLock = lockUtil.lock(id);
try {
do something;
return foo;
} finally {
lock.unlock();
}
}
I need to override this method to take in another…
user3791554
- 53
- 1
- 4
0
votes
1 answer
Java basic thread pool implementation with locks.ReentrantLock
I'm new at Java. I was just experimenting with threads, and I wanted to create something like a Thread Pool (if this is actually what I am doing..).
Basically I have a while loop which fires Threads until there are still tasks to be executed &&…
Redoman
- 3,059
- 3
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- 62
0
votes
2 answers
Query about disadvantage of Reentrant locks over synchronized block
I am reading comparison between Reentrant locks and synchronization blocks in java. I am going through the various resources on internet. One disadvantage that I discovered using Reentrant locks over synchronization blocks is that in previous one,…
Vinit89
- 583
- 1
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1 answer
Reentrant Read/Write locks in eclipse have two lock/unlock methods
I noticed that while calling lock/unlock on a ReentrantReadWrite lock, I am prompt with two lock and unlock methods.
For example, in the WriteLock I have a Lock() with -75% and another Lock() with no %. Both of these have the same documentations. I…
Quantico
- 2,398
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0 answers
FIFO for Write Order in ConcurrentHashMap
My CHM already contains following Data ->
1 Apple
2 Banana
3 Cat
4 dog
1,2,3,4 are keys and Apple, banana... are keys correspondingly.
If 3 threads t1, t2, t3 wants to modify the same existing record [3 Cat] . I need this write in FIFO…
HakunaMatata
- 814
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1 answer
Java - Reentrant WriteLock on static methods
How to use WriteLock on a static method? this is what I have got:
m_unitLock = new ReentrantReadWriteLock();
m_unitReadLock = m_unitLock.readLock();
m_unitWriteLock = m_unitLock.writeLock()
static List units = new…
tokhi
- 21,044
- 23
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0
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2 answers
ReentrantLock says "unlocked" but first thread stops
We're calling "lock()" on a ReentrantLock and threads are getting stuck there when they apparently shouldn't.
When debugging with a breakpoint just before the call to "lock()", the first thread would stop there with the program pointer going to…
Victor Basso
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