critical role

AOP, Chinese name, tangent. It's really cool to implement what you want without impacting your business code. This is not, recently came a demand.Business requirements: Want to record a number of critical business requests and operations! This itself is OK, but these requirements are too regular, we can not hard, or a word low.AOP is a good thing, and logging is a must.The same is true for recording data, so it can be done with AOP, and this is where

Linux kernel Saving critical information to a file a good way to debug Here are 2 examples: 1: Save the machine from the boot to the end of the Vbatt;2: Save the UART received data to the file; The meaning is not much to say. Here's the code: #include 1: Save Vbatt with SOC: static int Adjust_soc (struct pm8921_bms_chip *chip, int soc, int batt_temp, int chargecycles, int rbatt, int fcc_u Ah, int

PHP Critical fatal error handling: PHP Fatal Error:cannot redeclare class or function 1. Error type: PHP fatal error Error type:php Fatal error Fatal Error:cannot Redeclare (a) (previously declared in (b)) and (c) on line (d) 2. Error Description: The error report indicates that you are attempting to redefine a function that has already been defined, where A----represents a duplicate defined function name; b----The file name and line number of the fi

function returns when the specified object was in the signaled state or when the time-out interval elapses. and the function Waitform Ultipleobject can be used to simultaneously monitor multiple synchronization objects, the declaration of which is: DWORD Waitformultipleobject (DWORD ncount,const HANDLE *lphandles,bool bWaitAll, DWORD dwmilliseconds); Here are some of the objects that handle the critical section(1) Mutex object MutexThe state of a mut

VS2013 #include Draw a simple conclusion based on my test results (not necessarily very accurate): Time-consuming mutex > Critical > Spin lock When the spin lock uses sleep (0) CPU spin lock > Critical > Mutex Using sleep (1) spin lock is lower, consider other methods to optimize the spin lock, so that the idling and the time wasted wasting fully use!!! The optimized code is as follows: The

Lock system Critical files1. Password, account file chattr +i /etc/passwd /etc/group /etc/shadow/etc/gshadow/etc/inittab locking: chattr +i /etc/ passwd file cannot be deleted, cannot be changed, cannot be moved view lock: lsattr/etc/passwd file plus a parameter I means lock unlock: chattr-i/home/omc/h.txt - 2. Remove the address of the original command MV ' which chattr '/OPT/FTL use the chatter command: cd/opt ./ftl +i/etc/passwd

According to foreign media reports, Microsoft will release six Security Updates next Tuesday, two of which are used to fix Windows Vista vulnerabilities. Four of these six Security Updates fix critical vulnerabilities. One update fixes multiple security vulnerabilities. Therefore, it is unclear how many vulnerabilities these patches have fixed. One of the two Vista updates is used to fix Windows Mail vulnerabilities in Windows Vista and Windows Vist

Security Warning: A Critical system vulnerability that affects 0.13 billion Apple users Recently, security researchers have published a tweet about vulnerabilities on Apple devices and program code related to these vulnerabilities.Unsatisfactory vulnerability repairMedia exposed a critical vulnerability (CVE-2016-1757) in Apple's device System last week to bypass Apple's latest Protection feature, System In

Recently found to launch Tomcat when the following warning: the-9- - Ten: -: -Org.apache.catalina.loader.WebappClassLoader CLEARREFERENCESJDBC Critical: The Web application [] registered the JDBC driver [Com.mysql.jdbc.Driver] but failed-unregister it when the Web application was stopped. To prevent a memory leak, the JDBC Driver have been forcibly unregistered. the-9- - Ten: -: -Org.apache.catalina.loader.WebappClassLoader clearreferencesthreads Seri

(1). DescriptionThis example demonstrates how to use the lock, interlocked, and monitor classes to perform thread-critical operations (mutex)(2). CodeUsing system;Using system. Threading;Using system. collections; Namespace locks _ implement mutex operations in the critical section _{// Delegate Declaration (function signature)Delegate string mymethoddelegate (); Class myclass{Private Static arraylist arrli

This afternoon, glibc2.9 has been compiled.These critical programs are missing or too old: As LD Error. Check the Internet. GenerallyThese critical programs are missing or too old: It is indicated that the software version is too low or too high. I see my version is too high. I used to use ubuntu9.04 without any problem. When I reached 9.10, I encountered an error, this GCC is 4.4. According to th

Background: A few weeks ago, I upgraded my notebook to the WINDOWS10 Enterprise Edition, and today suddenly came across a problem: After entering the desktop, error: Critical errors, Start menu Cortana does not work, restart is invalid.Workaround: Right-click My Computer-----properties------Click "Control Panel" in the Address bar(If you have a Control Panel icon on your desktop, you can go directly to it.) Note: The main point is that your Star

The mistake that bothered me for half a year, was solved by accident today, hereby share to the friend who is tangled by the same problem!Previous help posts, no answer:Http://www.cnblogs.com/freeton/archive/2012/08/28/2660585.htmlhttp://bbs.csdn.net/topics/391988642SymptomsA large number of errors in the log, IIS critical error, such errors by default 5 minutes consecutive 5 times will cause the IIS application pool to hang up, after the application

Test instructionsThe sum of all even numbers in the Fibonacci sequence not exceeding 4000000.SOL:Or just a critical mode ... Look at the discussion area there seems to be a very good God's speech?The English level is too poor ...Mark belowThe Fibonacci sequence is a driven by the second order linear difference equation fn+2 = fn+1 + Fn, with boundary conditio NS F1 = 1, F2 = 1, and thus can be solved exactly. As we know from practice the FN is roughly

) {memset(DFN,0,sizeof(DFN));memset(Instack,false,sizeof(Instack));memset(Add_block,0,sizeof(Add_block));memset(Cut,false,sizeof(cut)); Index = top =0; Bridge =0; for(inti =1; I if(! Dfn[i]) Tarjan (i, I); Sort (A.begin (), A.end ());printf("%d critical links\n", bridge); for(inti =0; I printf("%d-%d\n", A[i].first-1, A[i].second-1);printf("\ n");}voidInit () {tot =0; num =0; A.clear ();memset(Head,-1,sizeof(head));}intMain () { while(~scanf("%d",

Windows_38_thread_criticalsection Thread-critical section // windows_38_thread_CriticalSection.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include "windows.h" CRITICAL_SECTION g_cs = { 0 }; long g_nValue = 0; void Print( ) { //进入临界区 - 加锁 EnterCriticalSection( g_cs ); for (int i = 0; i 10000000;i++) { g_nValue++; } printf( "Long long long ...Long long%ld\n",g_nValue );

synchronized Point GetLocation () { return location;} Public synchronized void setlocation { this.location = location; if (location.equals (destination)) { dispatcher.notifyavaliable (this);}} } class Dispatcher {private Final Set 4. Open call--to be filled5. Resource Deadlockexternal locks are often overlooked and lead to deadlocks, such as database locksTwo, the avoidance of the deadlock with the diagnosis 1. Support for timed deadlocksThere are some means of preventing dea

); Ans++; }} sort (Bridge,bridge+ans,cmp); printf ("%d critical links\n", ans); for(intI=0; i) {printf ("%d-%d\n", BRIDGE[I].U,BRIDGE[I].V); }}intCal_num (Charch[]) { intLen=strlen (CH), s=0; for(intI=1; i2; i++) {s=s*Ten+ch[i]-'0'; } returns;}intMain () {intt,cas=0; scanf ("%d",T); while(t--) {init (); Charch[Ten]; intM, u,v;//Number of sidesscanf"%d",N); for(intI=1; i) {scanf ("%d%s",u,ch); M=cal_num (CH);//intercept the number of digits d

Locking critical system files can increase system security, use the CHATTR command to lock, and here are a few files that need to be locked:Chattr +i/etc/passwd User fileschattr +i/etc/shadow User Password fileChattr +i/etc/group User Group filesChattr +i/etc/gshadow Master Password fileChattr +i/etc/inittab boot-up important filesExample:Locking[Email protected] ~]# chattr +i/etc/passwd/etc/shadow/etc/group/etc/gshadow/etc/inittab[[email protected] ~

Tags: based on the resulting record repair database technology share 3.4 concern anomaliesEBay: Using MongoDB to create business-critical multi-Datacenter applicationsAs the world's top ten retail brand, ebay has more than 170 million active users, and has 1 billion shopping lists spanning 190 markets around the world, so that on a scale, ebay is not allowed to have any downtime. That's why companies rely on MongoDB to provide enterprise-class platfor