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populatedEnum V4l2_buf_type type; V4l2_buf_type_video_capture__U32 index; This is explained here because count buffer is established when IOCTL-VIDIOC_REQBUFS is called. So, the valid range of index here is: 0 to count-1.Memory:v4l2_memory_mmap.The buffer specified by the struct is fed into the output queue, indicating that the buffer can be populated with device data.Usage:IOCTL--VIDIOC_DQBUF:int ioctl (int fd, int request, struct v4l2_buffer* ARGP);Parameter one: The handle produced by open (
Micro-letter reading interface into the after click "Find" and then we find "to find the book" option, open access. Then it will go to the bookstore interface as shown below. Casually choose a book after small series found that need money to be able to see. If there is a charge for the book, we can look down to see if there is a "time limit free" description, if there is free to see. Here Small series Choose a book can
Record the understanding of this join and refine it.1. Usage of statistics:Empty the command used to execute the planDBCC FREEPROCCACHEEmpty the cache command inside the buffer poolDBCC DROPCLEANBUFFERSThe two commands above can be performed before the SET STATISTICS command is executed1. Set STATISTICS TIME onExampleSet STATISTICS TIME onGoSelect COUNT (1) from zwkmye2017GoSet STATISTICS time offGoReturns the time that the statement was executed:Main analysis and compile timeCPU time correspond
1 First, open the voiceover (voice reading) function, no matter where you click will appear a black box. If you see the image below, there are boxes to follow, proving that you have opened the voiceover function. Then click the "Settings" button and press 2 times. Then find the "General" column in the "Settings" interface and press 2 times. (as shown in the following figure) Note: After opening the voiceover function, you need to choose which but
This section describes [programming languages] In the Reading Notes of C language. Currently, C language is widely used in many fields, such as games, embedded systems, and Smart appliances. Why not write data directly in assembly or machine language? The reason is that assembly and machine language are affected by the computer architecture. Written directly by means of an architectural assembly or machine instruction.ProgramIt can only run on a compu
It took me two nights to finish reading "software technology", which should be a non-technical computer book that I once again applauded after "programmer's Cultivation". Although it was just a waste of time, however, the problem solved my doubts. Software Engineering emphasizes the process of software development, while software technology emphasizes the importance of craftsman in software development. In other words, software engineering emphasizes
Programmer's self-modification: Reading and learning; programmer's modification of readingLanguage (C ++) Books: c ++ primer, Objective c ++, stl source code analysis, deep exploration of c ++ object models, and self-cultivation of programmers. Operating System Books: Linux kernel design and implementation, and advanced UNIX environment programming Network Books: TCP/IP Volume 1, UNIX network programming, linux high-performance Server programming-yo
It's better to read these hundred sentences after reading ten years of books.Never regret it for a lifetime! 1. Spider: It depends on the network.2. Shrimp: The day of red is the time of great sorrow.3. Balance: If you give more balance, you will be more inclined.4. waterfall: When the waterfall falls down.5. Saw: the hacker teeth, dedicated to separation.6. Balloon: as long as it is blown, it will float.7. watches and clocks: you can return to the st
Rarely read about writing code reading articles, occasionally encountered to make a backup, and we share I hate reading code. I've found that many programmers hate reading code--Please don't hide it, admit it. Almost everyone likes to write code--it's fun to write code. However, reading code is not easy, but also very
Transferred from: http://www.cnblogs.com/wang_yb/p/3514730.htmlAfter reading the book, it turned out that the first note was issued in August 2012, and nearly 1.5 of the time to read the book (Khan!!!).To facilitate later viewing, make a directory of Reading notes for the Linux kernel design and implementation: "Linux kernel design and implementation" reading
function Introduction "GLib XP" is a natural language reading program, with intelligent voice reading ability, in support of Chinese reading, English reading, on the basis of further support for the perfect bilingual reading function, to meet the needs of all kinds of artic
Small knitting very like to read novels, but online reading, very hurt eyes, and the network reading software, the current small compilation of the best novel software is to good reading Uread To good reading Uread is a versatile reading tool that not only supports search a
Reproduced from: Caffe code Reading-hierarchy-painless machine learning-Know the columns https://zhuanlan.zhihu.com/p/21796890 Caffe Source Reading--net Assembly-painless machine learning-Know the column https://zhuanlan.zhihu.com/p/21875025 Caffe code reading--solver-Painless machine learning-Know the column https://zhuanlan.zhihu.com/p/21800004 1.Caffe code
Last night contacted a Shuwang app-lazy people to listen to lectures, first Anli. The app is mainly lecture class recording, involving content including inspirational historical economic workplace and other topics, rich in content, it is suitable for late to sleep one hour before listening to a wave. I listened to a lecture last night, entitled How others read, and after listening to the next morning I recorded a feeling for forgetting. 1: What is reading
Tags: red one def CAS query you another UPD ISOThe level of isolation for MySQL InnoDB transactions is level four, which is "repeatable read" by default (Repeatable Read). Unread (Read UNCOMMITTED). Another transaction modifies the data but has not yet committed, and select in this transaction reads the uncommitted data (dirty read). Submit Read (COMMITTED). This transaction reads the most up-to-date data (after other transactions have been committed). The problem is that in the sam
1. Physics reading (physical read) When the data block is first read, it will be cached in the buffer cache, while the second read and modify the data block in memory buffer cache The following is an example: 1.1 First read: C:\Documents and Settings\paul yi>sqlplus "/as sysdba" Sql*plus:release 9.2.0.4.0-production on Thu Feb 09:32:04 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Connected to:Oracle9i Enterprise Edition Release
in the iphone, the ipad and so on, Safari is a browser is the iOS with a good browser, compared to what UC, QQ browser experience is even better, it is because of this, the fruit powder basically rarely use third-party browsers. Today, Xiao-bian mainly shares a safari browser trick that teaches you how to use safari reading patterns, how to turn them on and how little fruit powder notices. Safari Rea
The MySQL InnoDB transaction has level four isolation, and the default is "repeatable read" (Repeatable Read). Uncommitted read (read UNCOMMITTED). Another transaction modified the data, but it has not yet been submitted, and the select in this transaction reads the uncommitted data (dirty reads). Submit read (Read committed). This transaction reads the most current data (after other transactions have been committed). The problem is that in the same transaction, two times the same select will re
Click to have a surprise At the beginning of the 2018, artificial intelligence made a major breakthrough. Squad, the top event in the field of machine-reading comprehension, launched by Stanford University on January 11, has cheered the industry on the first time that artificial intelligence has surpassed humans in its history of reading. Alibaba has broken the world record with a 82.440 accuracy rate and
rollback pointer points to the row before the modification in the undo log. Transaction B executes the following statement UPDATE innodb_test SET name= ' Shing ', age=91 WHERE id=1; There are 2 records in the undo log that are connected by the rollback pointer. The existence of the undo log solves two problems, one is the data rollback, the other is the implementation of MVCC (Multi-version concurrency control), the snapshot read read is the data in the undo log, so this
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