Welcome to like: Collection ?Leave a message Please correct me if there are any mistakes, give people roses, and leave lingering fragrance in your hands! Author of this article: Original by webmote Author’s motto: In the new journey, we face not only technology but also people’s hearts. People’s hearts are immeasurable, and the sea water […]
Tag: locked
29. Blocked memory management [malloc, free]
There are many ways to implement memory management, but in the end they all need to implement two functions: malloc and free. The malloc function is used for memory application, and the free function is used for memory release. This article implements this through block memory management: It’s just that the allocation direction in the […]
Sangfor firewall’s high-risk attack IPs are automatically blocked through Zabbix
zabbix server configuration syslog service Modify configuration vi /etc/rsyslog.conf # Provides UDP syslog reception $ModLoad imudp $UDPServerRun 514 # Provides TCP syslog reception $ModLoad imtcp $InputTCPServerRun 514 #### GLOBAL DIRECTIVES #### # Where to place auxiliary files $WorkDirectory /var/lib/rsyslog # Use default timestamp format $ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat ## Here is the configuration added by the server […]
KingbaseES V8R6 creates index create index concurrently blocked
Foreword CREATE INDEX CONCURRENTLY (CIC) is one of the most commonly used statements by DBAs. Its advantage is that it does not block DML statements. But in systems with many large and long transactions, it may be blocked for a long time. This article starts from this blocking case to learn the process, principles and […]
Java adds watermarks and locked cells to large excel files, non-poi method
Java adds watermarks and locked cells to large excel files, non-poi method ! Please use standard sources for reprinting! https://blog.csdn.net/ImAdrian/article/details/133313827 Why not use poi? poi is dependent on the conflict, and is tortured to the point of death. Poi is too slow and disgusting Not much to say, let’s get straight to the code <dependency> […]
java.lang.IllegalStateException: Modification of locked parameter map is not allowed
Problem Description: This problem occurred when I was writing a javaweb project and doing sensitive word filtering The requirement is: if the data is obtained by getParameter(String s), you can directly modify the value and replace the part containing sensitive words with *** The request.getParameterMap() method returns an unmodifiable map containing HTTP request parameters. The […]
If writing junk code was a crime, I’d be locked up
Introduction Programmers hate poor-quality code, but in a high-pressure environment, we often ignore code specifications in order to solve the current needs as quickly as possible, and accumulate a lot of debt unconsciously. We also observed that the culprit of many developers being forced to work overtime is to write inefficient code and not pay […]
The blocking queue is locked based on the ReentrantLock class
Condition objects are typically used with Lock such as ReentrantLock. In a multi-threaded environment, Lock provides a more flexible locking mechanism, while Condition provides a richer thread waiting and wake-up mechanism. Common usage is: After acquiring the lock, call the await() method of Condition to make the current thread wait until a certain condition is […]
[Use the driver code to achieve the following requirements: the application reads the value of the number variable through the blocked io model]
Drive application layer code #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <sys/ioctl.h> #include “head.h” int main(int argc, char const *argv[]) {<!– –> int a, b; char buf[128] = {<!– –>0}; int fd_led1 = open(“/dev/led0”, O_RDWR); //corresponding key1 button if (fd_led1 < 0) {<!– –> printf(“Failed to open […]
Pointers & InterLocked
Pointers & InterLocked In this section, we will modify the initial Counter Job Use the IJobFor interface to implement parallel summation. Let’s start with a Naive version, let’s think about the problems in this job together: <pre> public structure NaiveParallelCounterJob : IJobFor {<!– –> [ ReadOnly ] public NativeArray < int > data ; public […]