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writer W: Can write No: 1 Nreader: Number of readers: 0 Mutex: "Mutual exclusion" between readers, the order of entry and exit: 1 S: For blocking follow-up readers: 1 Written by: Reader P (s) P (s) p (mutex) P (W) Nreader + + Write if (Nreader = 1)//First Reader V (W) P (W)//plugging writer V (s) v (mutex) V (s) Read P (Mutex) Nreader-- if (nreader==0)//Last Reader V (W)//Wake writer V (Mutex) Two. Over the log bridge Topic Description: The bridge is one-way, from west to east and from ea

First, the original wording A module is a set of methods for implementing a particular function. Just put the different functions (and the variables of the record state) simply together, even a module. function M1 () {//...} function m2 () {//...} The above function m1 () and M2 () to form a module. When used, call directly on the line. The disadvantage of this approach is obvious: "pollution" of the global

practice. Although this is not a beginner's tutorial, you can understand just a little bit about the basic syntax of JavaScript. first, the original wordingA module is a set of methods for implementing a particular function. Just put the different functions (and the variables of the record state) simply together, even a module. Copy Code code as follows: function M1 () { //... } function m2 () { //... } The above

Reprint Link This article has been transferred from Nanyi's technical blog: JavaScript Modular Programming: A preface to the module JavaScript modular programming has become an urgent requirement. Ideally, developers only need to implement the core business logic, and others can load other people's written modules.However, JavaScript is not a modular programming language, and it does not support "classes", let alone "modules".The JavaScript community has made a lot of effort to implement the "m

Ruby's constant lookup path problem is a problem that's been bothering me, in the work encountered several times, has not thoroughly understand why, recently read a book "Ruby Metaprogramming", the Ruby object model has a deeper understanding, and read a blog "Everything You Ever wanted to know about constant lookup in Ruby, let me finally get a clearer idea of the Ruby constant lookup path. The first problem I encountered, I have also been posted on the Ruby-china. Copy Code code as foll

Tags: style ddr ble mys app Beijing base character range1. Adding and removing changes and checking operationInquire:SELECT * from table name where field name operator number/character;Modify:Update table name SET field name = value,... where field name operator number/characterDelete:Delete from table name where field name operator number/character2. OperatorsNumeric comparison operators:=!=>>=Character comparison operators:=!=Logical operators:andOrIn-range comparison:Between andInchNot inMode

"modules", but it will take a long time to make it practical .) The Javascript community has made a lot of efforts to achieve the "module" effect in the existing runtime environment. This article summarizes the current best practices of "Javascript Modular programming" and explains how to put it into practice. Although this is not a preliminary tutorial, you only need to understand the basic syntax of Javascript. I. Original WritingA module is a set of methods to implement specific function

, 6, 44, 17,123, 78,43, 99, 54, 55, 67, 89, 14, 22, 38, 11, 7, 9, 8, 13, 23, 5, 6,44, 17,123, 78, 43, 99, 54, 55, 67, 89, 14, 22, 38, 11, 7, 9,8, 13, 23, 5, 6, 44, 17,123, 78, 43, 99, 54, 55, 67, 89, 14,22, 38, 11, 7, 9, 8, 13, 23, 5, 6, 44, 17,123, 78, 43, 99, 54,55, 67, 89, 14, 22, 38, 11, 7, 9, 8, 13, 23, 5, 6, 44, 17,123,78, 43, 99, 54, 55, 67, 89, 14, 22, 38 };Quicksort (ARR );}Long end = system. currenttimemillis ();System. Out. println ("quicksort:" + (end-Start) + "Ms ");} Private Static

[] ARGs){// Create a delegate instance and encapsulate the static method M1 of class CMydelegate d1 = new mydelegate (C. M1 );D1 ("d1"); // M1 // Create a delegate instance and encapsulate the static m2 method of class CMydelegate D2 = new mydelegate (C. m2 );D2 ("D2"); // m2 // Create a delegated instance and encapsulate Class C instance method m3Mydelegate D3

Input n N Max. Min. Input 5 1 5 2 3 6 Output 1 6 #includeView code # Include # Include Using namespace STD;Int main (){Int N, I, a [1000];While (CIN> N){For (I = 0; I Cin> A [I];Sort (A, A + n );Cout }} #includeView code # Include # Include Using namespace STD; Int main () { Int N, I, a [1000], M1, M2; While (CIN> N) { For (I = 0; I Cin> A [I]; If (I = 0) M1 = m2 = A [0]; If (A [I]> m2) m2

image (-centerx,-centery), the center is equal to (0, 0), then scale, and finally move the center to (centerx, centery ),: Math and easy proof: Or The matrix operation is amazing. In fact, layout animation is also implemented through the matrix class.Matrix computing The matrix class also provides a direct matrix calculation method. Matrix A = new matrix () is equivalent to creating a matrix of units. A. Set (B) is assigned A = B; A. preconcat (B), equivalent to the premultiplication, that i

) {// create a delegate instance and encapsulate the static method M1 mydelegate d1 = new mydelegate (C. m1); D1 ("d1"); // M1 // create a delegate instance and encapsulate the static method m2 mydelegate D2 = new mydelegate (C. m2); d2 ("D2"); // m2 // create a delegate instance and encapsulate the class C instance method m3 mydelegate D3 = new mydelegate (New C