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Synchronization vs Lock
...r can there be barging? Method level synchronization ensures fair or FIFO allocation of the lock. Using
synchronized(foo) {
}
or
lock.acquire(); .....lock.release();
does not assure fairness.
If you have lots of contention for the lock you can easily encounter barging where newer requests ...
Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation
...anipulate a few bytes on the top of the stack. A threat creation means: 1. allocating a stack, 2. performing a syscall, 3. creating data structures in the kernel and linking them up, grapping locks along the way, 4. waiting for the scheduler to execute the thread, 5. switching context to the thread....
What ports does RabbitMQ use?
...d by Erlang distribution for inter-node and CLI tools communication and is allocated from a dynamic range (limited to a single port by default, computed as AMQP port + 20000). See networking guide for details.
15672: HTTP API clients and rabbitmqadmin (only if the management plugin is enabled)
61...
Correct way to use StringBuilder in SQL
...which is usually too small and results in the StringBuilder having to do reallocations to make itself bigger (IIRC, in the Sun/Oracle JDK, it doubles itself [or more, if it knows it needs more to satisfy a specific append] each time it runs out of room).
You may have heard that string concatenation...
Posting a File and Associated Data to a RESTful WebService preferably as JSON
... the picture's data.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"myServerAddress"]];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:UIImageJPEGRepresentation(picture, 0.5)];
[request setValue:@"image/jpeg" forHTTPHeaderField:@"Content-Type"]...
PHP memory profiling
..., to see how much memory my data is using, and/or which function calls are allocating the most memory.
4 Answers
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Why is there no Constant feature in Java?
...calling some method with side effects. final is somewhat similair to stack allocation of C++ in terms of refering to an object rather than a pointer, but that's all it is. This is ofcourse in addition to what dom0 already said.
– Tim
Mar 28 '16 at 18:22
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How does the new automatic reference counting mechanism work?
...bjects on different lines? Those statements even tell you on what line you allocated the object. This has been taken a step further and now can insert retain/release statements at the proper locations, better than most programmers, almost 100% of the time. Occasionally there are some weird instances...
How to return smart pointers (shared_ptr), by reference or by value?
... N strings in the vector, each copy
could require as many as N+1 memory allocations and a whole slew of cache-unfriendly data accesses > as the string contents are copied.
Rather than confront that sort of anxiety, I’ve often fallen back on pass-by-reference to avoid
needless copies:
...
Using {} in a case statement. Why?
...l switch cases.
Micro optimizations- scope for a really expensive resource allocated variable that you want to destruct as soon as you leave the scope of the case, or even a more spaghetti scenario of the "GOTO" command usage.
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