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Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
...
This is done to keep state.
When you catch the InterruptException and swallow it, you essentially prevent any higher level methods/thread groups from noticing the interrupt. Which may cause problems.
By calling Thread.currentThread().interrupt(), you set the interrupt flag of the thread, s...
fastest (low latency) method for Inter Process Communication between Java and C/C++
... passing a single byte with code like this:
MappedByteBuffer mem =
new RandomAccessFile("/tmp/mapped.txt", "rw").getChannel()
.map(FileChannel.MapMode.READ_WRITE, 0, 1);
while(true){
while(mem.get(0)!=5) Thread.sleep(0); // waiting for client request
mem.put(0, (byte)10); // sending the re...
Differences between strong and weak in Objective-C
...eference to it. Once that is no longer the case, the object gets destroyed and your weak property will automatically get set to nil. The most frequent use cases of weak references in iOS are:
delegate properties, which are often referenced weakly to avoid retain cycles, and
subviews/controls of a ...
Algorithm to generate a crossword
...Basically:
Sort all the words by length, descending.
Take the first word and place it on the board.
Take the next word.
Search through all the words that are already on the board and see if there are any possible intersections (any common letters) with this word.
If there is a possible location fo...
What's the “average” requests per second for a production web application?
...mory database...still need to test with live DB. DB may be our bottleneck and bring us back down unless we switch to nosql).
– Dean Hiller
Jun 6 at 0:28
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scp (secure copy) to ec2 instance without password
I have an EC2 instance running (FreeBSD 9 AMI ami-8cce3fe5), and I can ssh into it using my amazon-created key file without password prompt, no problem.
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Calculating sum of repeated elements in AngularJS ng-repeat
...repeat . For each element in the array, it shows the item name, its amount and the subtotal ( product.price * product.quantity ).
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Getting the last element of a list
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some_list[-1] is the shortest and most Pythonic.
In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down t...
Getting “Lock wait timeout exceeded; try restarting transaction” even though I'm not using a transac
... on some record (you're updating every record in the table!) for too long, and your thread is being timed out.
You can see more details of the event by issuing a
SHOW ENGINE INNODB STATUS
after the event (in sql editor). Ideally do this on a quiet test-machine.
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Difference between “!==” and “==!” [closed]
... ==! in any language so I wondered how the hell this code could even work and did some testing:
5 Answers
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