1. Both An and B threads run simultaneously in an infinite loop. 2.How does thread A let thread B sleep for a while. 3.B Thread continues to loop indefinitely after hibernation. ...
public class User implements Serializable { private Object lock = new Object(); public void get(){ synchronized (lock){ } } } ...
the approximate code is as follows: func(id, ip){ int countId = jedis.hget("count", id); int countIP = jedis.get("count", ip); if(countId >= 5 || countIP>=5){ return; } ...
recently read "Java concurrent programming practice, " in Section 4.4.1, there is an example: suppose we need a thread-safe List, that needs to provide us with an atomic "put-if-absent " operation. And two implementations are provided: A non-thread...
Why not provide semaphores directly in RT,CPP11? Instead, it can be implemented jointly with mutexes and conditional variables, for what consideration? ...
how to understand instruction reordering has no effect on single thread, it will not affect the running result of the program, but it will affect multi-thread. for example: int i = 0; 1 i = i + 1; 2 System.out.println(i); 3 if reordering is pe...
when I see the conditional variables section of CPP11, I find that all conditional variables are used in conjunction with locks, but at this time they all use unique_lock instead of lock_guard,. Can you explain that? ...
want to write a two-person gluttonous snake game with python, which is divided into three threads, the main thread, and controls the entire game interface. The gluttonous snake of two users is two secondary threads. At the same time, pygame is used to di...
Thread 1 and thread 2 get the a method of class A through reflection at the same time, so which part of the method obtained by thread 1 and thread 2 is in memory? Are thread 1 and thread 2 getting the same method address? ...
Gods, I just learned java multithreading has a problem there are two ways to create a thread the first myTest a = new myTest(out,"ccc"); new Thread(a).start(); new Thread(a).start(); the second type new Thread(new myTest(...
there are some things I don t quite understand about buffer lines. 1 is cache row invalidation only for volatile, if it is not a volatile variable? 2 when you put it into practice, under what circumstances will the buffer line be populated? Do all cla...
the browser has JS engine thread, GUI rendering thread, event thread, timer thread, network thread, event polling processing thread. It is often said that the worker thread works under the deployment of the main thread, so is the main thread the JS engin...
https: www.jianshu.com p 2ab. for example, this sentence LoadLoad Barrier: for such a statement, Load1; LoadLoad; Load2, ensures that the data to be read by Load1 is read before the data to be read by Load2 and subsequent read operations is accesse...
for example, what tools can be used to test the number of concurrency with high concurrency? Because my code does not involve the database, there is no bottleneck in this area. or is there any testing framework that can be used for stress testing? Thank...
if a thread s wait executes before notify, then the program dies. How can we solve this problem? public class AaaTest { public static void main(String[] args) throws InterruptedException { Object obj=new Object(); Ttt ttt=new Ttt(o...
as in the title, write a simple function test to generate a soup object from the URL using Python requests and BeautifulSoup, (see the example below). If you call this function directly in the main thread, everything will be fine, but if you call this f...
[types.CHANGE_LAYER_ZINDEX] (state, dir, index) { ... } as above, what is this operation in vuex, using an array object as the function name? ...
simply use the asynchronous mysql client of swoole to obtain 100000 data. After spending a long period of time in php7 in one environment, you can execute the callback method of query to output data, but in the php5.4 of another environment, you do not...
the dynamic sql of mybatis is as follows in the xml file: count( DISTINCT item.RECORD_ID ) AS borrowNum -- () < if> as above, I want to judge whether the eachBook field is 0 or 1 . May I ask how to write it? I didn t say it even after...
topic description I store user information in localStorage userInfo, to encapsulate a method to modify userInfo related codes userInfof var userInfo= { id: 123 , name: Jim , info:{ address:{ home: , ...
the current server is the server of the 2-core 4GB swoole construction. There are 600clients (will continue to increase) the client sends a heartbeat to the server every minute, so it theoretically receives 600heartbeats at a time and throws them to t...