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kernel stack and user space stack
...e main difference is the size:
User-space can get away with statically allocating many variables on the stack, including
huge structures and thousand-element arrays.
This behavior is legal because user-space has
a large stack that can dynamically grow.
The kernel stack is neither large n...
IOS: verify if a point is inside a rect
...is in the UIView instance you are using.
Example:
UIView *aView = [UIView alloc]initWithFrame:CGRectMake(0,0,100,100);
CGPoint aPoint = CGPointMake(5,5);
BOOL isPointInsideView = [aView pointInside:aPoint withEvent:nil];
s...
RabbitMQ and relationship between channel and connection
...these concepts are not tied together.
Each Consumer runs in its own thread allocated from the consumer thread pool. If multiple Consumers are subscribed to the same Queue, the broker uses round-robin to distribute the messages between them equally. See Tutorial two: "Work Queues".
It is also possi...
What does PermGen actually stand for?
...
"In JDK 7, interned strings are no longer allocated in the permanent generation of the Java heap": oracle.com/technetwork/java/javase/jdk7-relnotes-418459.html
– almalkawi
Dec 20 '13 at 18:41
...
How to round the corners of a button
...
UIButton* closeBtn = [[UIButton alloc] initWithFrame:CGRectMake(10, 50, 90, 35)];
//Customise this button as you wish then
closeBtn.layer.cornerRadius = 10;
closeBtn.layer.masksToBounds = YES;//Important
...
iOS start Background Thread
... Put a breakpoint in this line: SpotMain *mirror = [[SpotMain alloc] init]; and tell me if its hit and, if tehn, which line crashes. Enable zombies please so we can get a clear error log.
– Nicolas S
Aug 14 '11 at 7:16
...
How to convert int to QString?
...
Then you probably want to work on pre-allocated buffers... but this sounds like a separate question.
– Georg Fritzsche
Apr 6 '17 at 4:45
a...
What is recursion and when should I use it?
... However, the real problem is in step #1. When many programs start, they allocate a single chunk of memory for their stack, and when they run out of that memory (often, but not always due to recursion), the program crashes due to a stack overflow.
So in these languages recursion is slower and it ...
When to use symbols instead of strings in Ruby?
...utput, you should go with strings, even if it appears more than once, even allocating two different objects in memory.
Here's the reasoning:
Printing the symbols will be slower than printing strings because they are cast to strings.
Having lots of different symbols will increase the overall mem...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
...the original one on which client initially tried to connect. If any server allocates different server-ports after a socket is bound, then in my opinion the server is wasting its resource and it must be needing the client to connect again to the new port assigned.
A bit more for completeness:
Examp...