terminology

问题 Hi I did get how the Counting Semaphore works? Please help me in understanding. As per my understanding if we set count as 3, then process can use 3 threads to access the resource. so, here just 3 threads have access on the resource. When 1 thread leaves the other waiting thread comes in. If my understanding is correct, these 3 thread can corrupt shared data too. Then what is use of it? 回答1: Your observations are correct; typically a resource either needs to be restricted to one thread (e.g.

问题 I would like to know the difference between those terms : facts functor predicate. rule in Prolog. if I write: brother(john, jack). is that a fact? or a predicate? 回答1: From ISO/IEC 13211-1 First edition 1995-06-01 Information technology - Programming languages - Prolog - Part 1: General Core 3.9 arity : The number of arguments of a compound term. Syntactically, a non-negative integer associated with a functor or predicate. 3.19 body : A goal, distinguished by its context as part of a rule

问题 What is the technically correct way of referring to "high ascii" or "extended ascii" characters? I don't just mean the range of 128-255, but any character beyond the 0-127 scope. Often they're called diacritics, accented letters, sometimes casually referred to as "national" or non-English characters, but these names are either imprecise or they cover only a subset of the possible characters. What correct, precise term that will programmers immediately recognize? And what would be the best

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago . I'm stumped trying to come up to a difference between a website and a web application for myself. As I see it, a web site points to a specific page and a web application is more of some sort of 'portal' to content and information. But where I'm stuck is that a web application

问题 I heard that there are 3 kind of concurrency. Deterministic concurrency Message-passing concurrency Shared-state concurrency I know #2 (=actor model) and #3 (=general threading), but not #1. What's that? 回答1: Deterministic concurrency is a concurrent programming model such that programs written in this model have the following property: for a given set of inputs, the output values of a program are the same for any execution schedule. This means that the outputs of the program depend solely on

问题 In the example below, why do we say "k.send :hello" instead of "k.receive :hello" if, as stated elsewhere, k is actually the receiver? It sounds like k is the sender rather than the receiver. When we say "k.send :hello" who is sending, if not k? (Are you as confused as I am?) class Klass def hello "Hello!" end end k = Klass.new k.send :hello #=> "Hello" k.hello #=> "Hello" 回答1: Whatever object contains this code is sending the message — presumably main. Let's look at it with more explicit

问题 what is a native object means i found the that java has peer class to interface with native objets? 回答1: Java programs can use JNI to access to functions implemented in native code (anything compiled to machine code). Interfacing with object oriented native code requires a java class which forwards method calls from java to an instance of the native class using jni. This class is the java peer of the native class. An example: We have the print_hello class in c++ which we need to use in a java

问题 I need to know what the event loop in the ios life cycle does?. Can any one suggest me regarding this?? 回答1: The best answer is probably the one provided by Apple in the "Main event loop" section of the Cocoa Application Competencies for iOS document. In the main event loop, an application continuously routes incoming events to objects for handling and, as a result of that handling, updates its appearance and state. An event loop is simply a run loop: an event-processing loop for scheduling

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . What is the difference between project management and process management? 回答1: The defining characteristic of process vs. project is

问题 What is the difference between a function and a subroutine? I was told that the difference between a function and a subroutine is as follows: A function takes parameters, works locally and does not alter any value or work with any value outside its scope (high cohesion). It also returns some value. A subroutine works directly with the values of the caller or code segment which invoked it and does not return values (low cohesion), i.e. branching some code to some other code in order to do some