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鍍金池/ 問(wèn)答

<category android:name="android.intent.category.BROWSABLE" /> 補(bǔ)上

夏夕 回答

Linux的管道實(shí)現(xiàn)是個(gè)環(huán)形緩沖區(qū):

/**
 *    struct pipe_buffer - a linux kernel pipe buffer
 *    @page: the page containing the data for the pipe buffer
 *    @offset: offset of data inside the @page
 *    @len: length of data inside the @page
 *    @ops: operations associated with this buffer. See @pipe_buf_operations.
 *    @flags: pipe buffer flags. See above.
 *    @private: private data owned by the ops.
 **/
struct pipe_buffer {
    struct page *page;
    unsigned int offset, len;
    const struct pipe_buf_operations *ops;
    unsigned int flags;
    unsigned long private;
};


/**
 *    struct pipe_inode_info - a linux kernel pipe
 *    @mutex: mutex protecting the whole thing
 *    @wait: reader/writer wait point in case of empty/full pipe
 *    @nrbufs: the number of non-empty pipe buffers in this pipe
 *    @buffers: total number of buffers (should be a power of 2)
 *    @curbuf: the current pipe buffer entry
 *    @tmp_page: cached released page
 *    @readers: number of current readers of this pipe
 *    @writers: number of current writers of this pipe
 *    @files: number of struct file referring this pipe (protected by ->i_lock)
 *    @waiting_writers: number of writers blocked waiting for room
 *    @r_counter: reader counter
 *    @w_counter: writer counter
 *    @fasync_readers: reader side fasync
 *    @fasync_writers: writer side fasync
 *    @bufs: the circular array of pipe buffers
 *    @user: the user who created this pipe
 **/
struct pipe_inode_info {
    struct mutex mutex;
    wait_queue_head_t wait;
    unsigned int nrbufs, curbuf, buffers;
    unsigned int readers;
    unsigned int writers;
    unsigned int files;
    unsigned int waiting_writers;
    unsigned int r_counter;
    unsigned int w_counter;
    struct page *tmp_page;
    struct fasync_struct *fasync_readers;
    struct fasync_struct *fasync_writers;
    struct pipe_buffer *bufs;
    struct user_struct *user;
};

curbuf是當(dāng)前緩存區(qū)的下標(biāo),每個(gè)緩沖區(qū)里有offset和len記錄數(shù)據(jù)寫(xiě)到的位置,讀寫(xiě)的時(shí)候是要修改這些信息的。

如果兩個(gè)進(jìn)程同時(shí)進(jìn)行讀或者同時(shí)進(jìn)行寫(xiě),必要會(huì)導(dǎo)致數(shù)據(jù)沖突,所以內(nèi)核會(huì)對(duì)管道上鎖(pipe_inode_info里的mutex),所以是半雙工的。

比較簡(jiǎn)單的實(shí)現(xiàn)可以看xv6的實(shí)現(xiàn)

struct pipe {
  struct spinlock lock;
  char data[PIPESIZE];
  uint nread;     // number of bytes read
  uint nwrite;    // number of bytes written
  int readopen;   // read fd is still open
  int writeopen;  // write fd is still open
};

直接一塊連續(xù)的內(nèi)存data,用兩個(gè)數(shù)字nreadnwrite記錄讀寫(xiě)數(shù),通過(guò)PIPESIZE取模得到在data上的讀寫(xiě)位置,用自旋鎖保護(hù)。如果沒(méi)有鎖,兩個(gè)進(jìn)程就能同時(shí)寫(xiě)數(shù)據(jù)到data和修改nwrite,數(shù)據(jù)也就沖突了,同時(shí)讀也同理。

哚蕾咪 回答

你要的第二種格式是數(shù)組格式的數(shù)據(jù),所以你要確保json.dumps之前是數(shù)組結(jié)構(gòu)數(shù)據(jù),建議把你的res1 dump之前 print出來(lái)看看是什么樣的

幼梔 回答

給我 1000億美元,我?guī)湍惆寻俣荣I下來(lái),這已經(jīng)是最便宜的解決方案了,google 我怕你買不起

淺淺 回答
 var filename = "./src/pages/scene/register/register.ejs";
    //ext = /[^.]+$/.exec(filename);
    ext = filename.split('.').pop();
    console.log(ext);


我不懂 回答

name: 'tool-tips',
import ToolTips from '../conversationList/components/tooltips'
拋出和接受的不一樣吧
看提示是你沒(méi)注冊(cè)

尛憇藌 回答

element-uiiview中都有transition

提供一個(gè)在iviewissue中別人寫(xiě)的問(wèn)題代碼鏈接,重點(diǎn)在使用方法上,https://github.com/iview/ivie...
凝雅 回答

shell 下應(yīng)該是調(diào)用 User.objects.create_user(username="xxx", password="xxx")`.

氕氘氚 回答

SDK大法好

參考這個(gè)鏈接:鏈接描述

我的代碼:

    import fs from 'fs'
    import koaMulter from 'koa-multer'
    import COS from 'cos-nodejs-sdk-v5'
    import variants from './../../config/var'
    
    let cos = new COS({
        SecretId: variants.secretId,
        SecretKey: variants.secretKey
    })
    let storage = koaMulter.diskStorage({
        destination (req, file, callback) {
            callback(null, 'tmp/')
        },
        filename (req, file, callback) {
            let fileOriginName = file.originalname.split('.')
            let len = fileOriginName.length
    
            callback(null, `${fileOriginName.slice(0, len - 1)}-${+new Date()}.${fileOriginName.splice(len - 1, len)}`)
        }
    })
    const multer = new koaMulter({ storage })
    
    router
        .post('upload_img/', multer.single('image'), async (ctx) => { // 上傳圖片
            const { 
                file
            } = ctx.req
            const params = {
                SecretId: variants.secretId,
                SecretKey: variants.secretKey,
                Bucket: variants.Bucket,
                Region: variants.Region,
                Key: `./${file.filename}`,
                FilePath: file.path
            }
    
            function pushImgToQCloud () {
                return new Promise((resolve, reject) => {
                    cos.sliceUploadFile(params, function (err, data) {
                        if (err) {
                            return reject(err)
                        } else {
                            return resolve(data)
                        }
                    })
                })
            }
    
            try {
                let res = await pushImgToQCloud()
    
                ctx.body = resProcessor({
                    type: 'success',
                    data: `http://${variants.uploadImgHost}/${res.Key}`
                })
            } catch (err) {
                ctx.body = resProcessor({
                    type: 'custom',
                    code: 101,
                    msg: '圖片上傳失敗',
                    data: JSON.stringify(err)
                })
            }
        })

更多配置可以參考騰訊云sdk的文檔:
demo
騰訊云對(duì)象儲(chǔ)存文檔

背叛者 回答

用定時(shí)器不斷檢查,

  1. document: 你需要知道DOM文檔是否已經(jīng)加載。
  2. document.getElementsByTagName和document.getElementById:檢查document.getElementsByTagName和document.getElementById函數(shù),當(dāng)存在這些函數(shù)則表明DOM已經(jīng)加載完畢。
  3. document.body: 作為額外補(bǔ)充,檢查元素是否已經(jīng)完全加載。理論上前一個(gè)檢查應(yīng)該已經(jīng)能做出判斷,但有些情況下還是不夠。
爛人 回答

Math.floor(num) == num就行了,但1.0沒(méi)法排除,也不可能排除,因?yàn)閖s里數(shù)字1.0和整數(shù)1是一個(gè)東西。字符串的話用斷言咯

涼心人 回答

啟動(dòng)php服務(wù)才能讀取php;不是服務(wù)問(wèn)題就是路徑錯(cuò)了,php文件夾是不是應(yīng)該放在src同級(jí);

疚幼 回答
 $message= array(
            'email.required'=>'請(qǐng)輸入合法郵箱',
            'password.required'=>'請(qǐng)輸入密碼'
        );

應(yīng)該這樣寫(xiě)吧我記得。

巫婆 回答

用正則 Python正則表達(dá)式

#!/usr/bin/python
# -*- coding: UTF-8 -*- 
import re
 
str = "aabbcc!!";
 
searchObj = re.search( r'[,.!?,。?。縘{2,}', str);
 
if searchObj:
   print("searchObj.group() : ", searchObj.group());
else:
   print("Nothing found!!");

你的第二個(gè)文件和第一文件路徑一樣么?我估計(jì)你是把緩存里的文件打開(kāi)了。

巫婆 回答

因?yàn)槟阌?DateTime.Now.Millisecond 做隨機(jī)種子, 這個(gè)是毫秒級(jí)的, 如果兩次調(diào)用在1毫秒一下, 你兩次用的隨機(jī)種子就是一樣的,跑出的結(jié)果也一樣, 如果兩次調(diào)用超過(guò)1毫秒,則種子不同了, 隨機(jī)序列也不同了。

使勁操 回答

圖片描述

可以重寫(xiě)覆蓋他的css樣式,或者寫(xiě)個(gè)class覆蓋