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...
I would like to ask you how we usually do bulk data import into the database. I now have a small amount of data, and I feel that the time for importing it one by one is acceptable, but when I think about a large amount of data, this is not very good. So ...
is there a book to improve abstraction in designing database tables according to requirements? ...
flex layout how to force line wrapping, always squeeze together, how to force line wrapping, so as not to let it wrap automatically ...
how does the webapp chat app do, like Wechat s chat dialog box? ...
We can use xdebug_debug_zval () to view two pieces of information about the zval container, refcount and is_ref. <?php $a = 123456789; xdebug_debug_zval ( a ); echo PHP: . PHP_VERSION; ?> print out on the page: a: (refcount=0, is_r...