Research on Davids principle: thread synchronizer in Java Concurrent package (CountDownLatch, CyclicBarrier and Semaphore)

Article catalog Thread synchronizer in Java Concurrent package (CountDownLatch, CyclicBarrier and Semaphore) CountDownLatch Core method 1: countDown Core method 2: await Core method 3: getCount CyclicBarrier Core method 1: await Core method 2: reset Semaphore Core method 1: construction Core me ...

Posted by Richard Bowser on Mon, 15 Jun 2020 06:48:35 +0200

Don't know ConcurrentHashMap yet?This source code is analyzed and interpreted

Articles have been included in Github.com/niumoo/JavaNotes Welcome to Star and Instructions. Welcome to my attention Public Number , articles are updated weekly. The previous article introduced the HashMap source code, which was very popular. Many students expressed their opinions. This time it came again. This time it is ConcurrentHashMap. A ...

Posted by MadnessRed on Mon, 15 Jun 2020 03:09:09 +0200

Mysql enable slow query and log analysis

1, Why open slow query Most of the reasons for the poor query performance are the large amount of data. To start the slow query of mysql and record the SQL statements that take a long time to query in the log is conducive to our better position and optimization. 2, Several common reasons for the ...

Posted by bg on Sun, 14 Jun 2020 05:47:10 +0200

Week14 cat sleeping problem

Title: As we all know, TT has a magic meow at home. This meow is very sleepy. There is no day or night when you sleep. Meow meow can sleep many times a day!! Sleep as long as you want Meow sleep time is continuous, that is, once meow starts to sleep, it can not be disturbed, otherwise meow will bite peo ...

Posted by rline101 on Sun, 14 Jun 2020 05:38:52 +0200

Sword finger Offer (java answer)

Reprint website: http://blog.csdn.net/sinat_29912455/article/details/51137349 Sword finger Offer (java answer) Sword point Offerjava answer 3 search in 2D array 4 replace space 5 print the linked list from the ...

Posted by blt2589 on Sun, 14 Jun 2020 03:19:41 +0200

bzoj4559 performance comparison [dynamic programming + Lagrange interpolation]

Solving ideas: Let's set f[i][j] to represent the number of programs i n the previous i-course where a total of J people were not crushed. The answer is f[m][n_1_k] Assume the transfer from f[i_1][w] to f[i][j](j < w) The number of people who were not crushed should have increased by Ri_1, but some may not have been crushed before. There ...

Posted by chaser7016 on Sat, 13 Jun 2020 19:17:36 +0200

8: object storage OSS

Article catalog Brand management of shopping mall New brand management menu Optimize display status Alibaba cloud object storage OSS What is object storage OSS Related concepts Storage Class Storage space (Bucke ...

Posted by thomas2 on Sat, 13 Jun 2020 10:17:45 +0200

csp simulation question-stones legend

subject Question number: 201609-3 Test Name: Stone Legend Time limit: 1.0s Memory limit: 256.0MB Description of the problem: Hearthstone: Heroes of Warcraft is an exchange card game developed by Blizzard Entertainment (pictured below).The game is played on a battle board in which two players take turn ...

Posted by BrandonRoy on Sat, 13 Jun 2020 03:35:26 +0200

Hero League data analysis topic

Words written in the front                                                            Hero League is a MOBA game with many players all over the world. It accompanies the growth of our generation. In the game, a team of five players is divided into two camps, red and blue. The team that first pushes ...

Posted by gargoylemusic on Fri, 12 Jun 2020 10:05:18 +0200

The dream of programming thinking C - TT (SPFA algorithm)

subject TT had a dream this night! In the dream, TT's wish came true, and he became the leader of meow star! There are n commercial cities on meow star, numbered 1-N, among which city 1 is the capital city of TT. There are M directional roads on meow star for commercial cities to communicate with eac ...

Posted by mattclements on Fri, 12 Jun 2020 09:11:02 +0200