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鍍金池/ 問答/ C問答
荒城 回答

想到兩個方法:

方法一:
如果是比較新的內(nèi)核版本3.9以上,支持SO_REUSEPORT,那么你可以:

  1. 啟動一個新的進程,也監(jiān)聽相同的端口。
  2. 新的進程啟動后給老的進程發(fā)個信號。
  3. 老的進程收到后停止接收新的連接請求(停止Accept,關(guān)閉Listen Socket),
    等所有已經(jīng)存在的連接處理完自動退出。

如果不支持SO_REUSEPORT,不同進程無法同時監(jiān)聽同一個端口,則需要在老的進程內(nèi)fork一個子進程,并且把負(fù)責(zé)監(jiān)聽的文件描述符傳給新進程。
這個方法可以實現(xiàn)你的需求,但需要比較多的修改Golang封裝的net/http等系統(tǒng)庫,技術(shù)復(fù)雜度比較高。
好處是不需要nginx參與,對它透明。

方法二:
可以同時運行兩個或更多個http server,同時提供服務(wù),讓nginx做負(fù)載均衡,其中有一個需要升級重啟時,就發(fā)個信號,收到信號后停止接收新請求,已有請求處理完畢正常退出就可以了。這個過程不需要修改nginx配置,也不需要reload nginx。
這個方法也需要改Golang封裝的net/http,但修改量相比方法一會小很多。

朕略傻 回答

非阻塞模式下,沒有數(shù)據(jù)返回值是-1,并且錯誤碼是EAGAIN or EWOULDBLOCK。

過客 回答

“交易完成后,支付平臺會按照notify_url地址將交易結(jié)果以后臺的方式發(fā)送到商戶網(wǎng)站,因前端響應(yīng)受用戶網(wǎng)絡(luò)波動因素較大,所以需要以后臺結(jié)果通知接受訂單支付結(jié)果,至于你說的被偽裝調(diào)用的問題,支付平臺請求商戶平臺通知時是會有平臺公鑰和商戶私鑰生成的簽名,同時商戶平臺會有響應(yīng)”

安淺陌 回答

你寫的代碼本職區(qū)別就是協(xié)程理念

在你這段代碼里除了多了概念,運行基本區(qū)別沒有,都是一次fgets阻塞,實際是沒有利用協(xié)程讓什么cpu

糖果果 回答

thinkphp自帶的驗證碼一下就破解了

北城荒 回答

python官方庫中沒有,因為你并不能知道內(nèi)存地址處存儲的對象是什么類型的,對于一切都是用對象的python(底層c中的對象),僅根據(jù)一個內(nèi)存地址無法判斷底層c的類型

貓小柒 回答

以前一個交換機就是一個LAN,一個LAN就是一個廣播域。

后來交換機支持VLAN了,每個VLAN就是一個廣播域了。

假灑脫 回答

這是一個坑
xml模板不能有空格,清除掉就可以了

微信官方文檔給的模板有空,但沒有做提示。

心沉 回答

1.網(wǎng)絡(luò)出問題的時候要在接口里面判斷,若請求失敗就使用 mui('#refreshContainer').pullRefresh().endPulldown();方法關(guān)閉正在‘正在刷新...’的字樣。
2.判斷一下少于多少條數(shù)據(jù)的時候就用這個方法,隱藏上拉加載更多mui('#refreshContainer').pullRefresh().disablePullupToRefresh();

爛人 回答

因為有return啊,return下面所有行的代碼都不重要了,還保留上下文干嘛。

陌璃 回答

首先我來說明一下,關(guān)于not a bug but a feature的意思是不是bug,是PHP的新特性,PHP4,PHP5,PHP7都支持,具體可以看這篇文檔 http://www.php.net/manual/zh/...。

對于一個函數(shù)定義,假設(shè)如下:

function test() {
    func_get_args();
}
test(1,2,3,4);

在函數(shù)內(nèi)部通過func_get_args()函數(shù)就可以取得傳入的參數(shù)。也就是說,這本身就是PHP語法規(guī)則的一部分,假設(shè)調(diào)用PHP的函數(shù)或方法的時候傳遞的參數(shù)個數(shù)為N,定義方法或函數(shù)的時候的參數(shù)個數(shù)為X,則有 N >= X;另外,如果在定義方法或函數(shù)的時候?qū)?shù)設(shè)置了默認(rèn)值,則這個參數(shù)可以不傳。

既然說到這種是PHP本身語法規(guī)則的一部分,我這里告訴你一個PHP本身的函數(shù)就是通過這個原理實現(xiàn)的,那就是compact函數(shù)。

舉個例子

$a = 'test a';
$b = 'test b';
$c = 'test c';
$d = compact('a','b','c');

此時的$d為:

$d = [
    'a' => 'test a',
    'b' => 'test b',
    'c' => 'test c'
];

在這種情況下就可以傳無限個參數(shù),然后如果根據(jù)這個參數(shù)判斷存在以這個參數(shù)命名的變量,則把這個變量的值為數(shù)組的value,以參數(shù)名為數(shù)組的key進行打包,然后返回一個數(shù)組。

背叛者 回答

setTimeout第一個參數(shù)是 Function,而你傳了一個executeDataCopy(data),這是一個方法的調(diào)用(而不是方法本身),實際上你傳給setTimeout的是undefined,可以按上面幾位大佬的方法改。

巫婆 回答

簡單來說是有特別的標(biāo)志位。Wiki上是這么說的:

In IEEE 754 standard-conforming floating-point storage formats, NaNs are identified by specific, pre-defined bit patterns unique to NaNs. The sign bit does not matter. Binary format NaNs are represented with the exponential field filled with ones (like infinity values), and some non-zero number in the significand field (to make them distinct from infinity values). The original IEEE 754 standard from 1985 (IEEE 754-1985) only described binary floating-point formats, and did not specify how the signaling/quiet state was to be tagged. In practice, the most significant bit of the significand field determined whether a NaN is signaling or quiet. Two different implementations, with reversed meanings, resulted:
most processors (including those of the Intel and AMD's x86 family, the Motorola 68000 family, the AIM PowerPC family, the ARM family, the Sun SPARC family, and optionally new MIPS processors) set the signaling/quiet bit to non-zero if the NaN is quiet, and to zero if the NaN is signaling. Thus, on these processors, the bit represents an 'is_quiet' flag;
in NaNs generated by the PA-RISC and old MIPS processors, the signaling/quiet bit is zero if the NaN is quiet, and non-zero if the NaN is signaling. Thus, on these processors, the bit represents an 'is_signaling' flag.
The former choice has been preferred as it allows the implementation to quiet a signaling NaN by just setting the signaling/quiet bit to 1. The reverse is not possible with the latter choice because setting the signaling/quiet bit to 0 could yield an infinity.
The 2008 revision of the IEEE 754 standard (IEEE 754-2008) makes formal recommendations for the encoding of the signaling/quiet state.
For binary formats, the most significant bit of the significand field should be an 'is_quiet' flag. I.e. this bit is non-zero if the NaN is quiet, and zero if the NaN is signaling.
For decimal formats, whether binary or decimal encoded, a NaN is identified by having the top five bits of the combination field after the sign bit set to ones. The sixth bit of the field is the 'is_quiet' flag. The standard follows the interpretation as an 'is_signaling' flag. I.e. the signaling/quiet bit is zero if the NaN is quiet, and non-zero if the NaN is signaling. A signaling NaN is quieted by clearing this sixth bit.
For IEEE 754-2008 conformance, the meaning of the signaling/quiet bit in recent MIPS processors is now configurable via the NAN2008 field of the FCSR register. This support is optional in MIPS Release 3 and required in Release 5.[10]
The state/value of the remaining bits of the significand field are not defined by the standard. This value is called the 'payload' of the NaN. If an operation has a single NaN input and propagates it to the output, the result NaN's payload should be that of the input NaN (this is not always possible for binary formats when the signaling/quiet state is encoded by an 'is_signaling' flag, as explained above). If there are multiple NaN inputs, the result NaN's payload should be from one of the input NaNs; the standard does not specify which.

喵小咪 回答

1)把比特流還原為幀;
鏈路層
2)決定使用哪些路徑將數(shù)據(jù)傳送到目的端;
網(wǎng)絡(luò)層
3)差錯控制;
物理層、鏈路層、網(wǎng)絡(luò)層、傳輸層
4)擁塞控制;
傳輸層、網(wǎng)絡(luò)層
5)流量控制;
網(wǎng)絡(luò)層、傳輸層
6)傳輸介質(zhì)
物理層

刮刮樂 回答

不一定??赡懿皇沁B續(xù)的。因為有分頁映射到物理地址,所以最多一個內(nèi)存頁內(nèi)部連續(xù),頁和頁之間可以不連續(xù)。

不舍棄 回答

fs.writeFile 第二個參數(shù)可以接受 string Buffer Uint8Array 的,直接寫文件就行了啊。