synchronization – Page 3

What is java’s equivalent of ManualResetEvent? [duplicate]

December 2, 2023 by Tarik

class ManualResetEvent { private final Object monitor = new Object(); private volatile boolean open = false; public ManualResetEvent(boolean open) { this.open = open; } public void waitOne() throws InterruptedException { synchronized (monitor) { while (open==false) { monitor.wait(); } } } public boolean waitOne(long milliseconds) throws InterruptedException { synchronized (monitor) { if (open) return true; monitor.wait(milliseconds); … Read more

Running code on the main thread from a secondary thread?

November 30, 2023 by Tarik

There is no universal way to just send some code to another running thread and say “Hey, you, do this.” You would need to put the main thread into a state where it has a mechanism for receiving work and is waiting for work to do. Here’s a simple example of setting up the main … Read more

Google Cloud Storage – GSUtil – Copy files, skip existing, do not overwrite

November 30, 2023 by Tarik

Synchronization on the local variables

November 29, 2023 by Tarik

if (foo.needsProcessing()) { synchronized (foo) { foo.process(); // foo’s state may be changed here } } I think there is a race condition in the above fragment that could result in foo.process() occasionally being called twice on the same object. It should be: synchronized (foo) { if (foo.needsProcessing()) { foo.process(); // foo’s state may be … Read more

What is the use of Collections.synchronizedList() method? It doesn’t seem to synchronize the list

November 26, 2023 by Tarik

A synchronized list only synchronizes methods of this list. It means a thread won’t be able to modify the list while another thread is currently running a method from this list. The object is locked while processing method. As an example, Let’s say two threads run addAllon your list, with 2 different lists (A=A1,A2,A3 and … Read more

How to do “one shot” time sync using chrony?

November 24, 2023 by Tarik

Try sudo chronyc -a makestep This will update your system clock quickly (might break some running applications), using the time sources defined in /etc/chronyd.conf. -a is needed to avoid 501 Not authorised error

How and When to Use @async and @sync in Julia

September 29, 2023 by Tarik

According to the documentation under ?@async, “@async wraps an expression in a Task.” What this means is that for whatever falls within its scope, Julia will start this task running but then proceed to whatever comes next in the script without waiting for the task to complete. Thus, for instance, without the macro you will … Read more

Using string as a lock to do thread synchronization

September 27, 2023 by Tarik

Strings like that (from the code) could be “interned”. This means all instances of “ABC” point to the same object. Even across AppDomains you can point to the same object (thx Steven for the tip). If you have a lot of string-mutexes, from different locations, but with the same text, they could all lock on … Read more

Best way to instantly mirror/sync files from Windows to Linux server [closed]

September 23, 2023 by Tarik

I second eneset’s proposal of the Unison software. Also if you care of looking for some alternatives Lifehacker has an interesting article on this subject http://lifehacker.com/372175/free-ways-to-synchronize-folders-between-computers titel