Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Use a <a href="http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/CountDownLatch.html" rel="nofollow"><code>CountDownLatch</code></a>. Initialize it before any of the threads run with the count to one. Your code will then look something like this:</p> <pre><code>class Test { static CountDownLatch latch = new CountDownLatch(1); public static void t1() { //This method will be called in a Thread called T2 /*This method must wait for flag to become 1. As soon it becomes 1 this must return. However it should wait for maximum n seconds. After that even if flag is 0 it must return.*/ latch.await(1L,TimeUnit.SECONDS); //your remaining logic } public static void m1() { //your logic latch.countDown(); } } </code></pre> <p>A <code>CountDownLatch</code> is a somewhat modified, enhanced (e.g. timeout option), and arguably easier-to-understand implementation of a <a href="https://en.wikipedia.org/wiki/Semaphore_%28programming%29" rel="nofollow">Semaphore</a> - one of the basic structures used widely for thread synchronization across a number of languages (not only Java). Note the following when comparing the Wikipedia reference to the Java implementation:</p> <ul> <li><code>P</code>/<code>wait()</code> corresponds to <code>await()</code>, with the difference that <code>await()</code> doesn't change the <code>count</code> value.</li> <li><code>V</code>/<code>signal()</code> corresponds to <code>countDown()</code>, with the difference that <code>countDown()</code> counts <strong>down</strong>, not up (obviously).</li> </ul>
    singulars
    1. This table or related slice is empty.
    1. POJava : One thread needs to wait for other to be done
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USmikołak
    1. USmikołak
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POJava : One thread needs to wait for other to be done
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COPerfect! Seems like a flawless approach!
      singulars
      1. PO
      1. USsnow_leopard
    2. CO@snow_loeopard: glad that helped. I've made one style improvement and added some general reference for further reading.
      singulars
      1. PO
      1. USmikołak
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload