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TCP 的那些事儿(下) - 更多技术 - 清泛网 - 专注C/C++及内核技术
... 算法
但是上面的这个算法在重传的时候会出有一个终极问题——你是用第一次发数据的时间和ack回来的时间做RTT样本值,还是用重传的时间和ACK回来的时间做RTT样本值?
这个问题无论你选那头都是按下葫芦起了瓢。 如下图所...
C# vs C - Big performance difference
...ction. It isn't always faster because a native language generated it, the cpu doesn't care.
– Hans Passant
Mar 17 '12 at 10:09
17
...
Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的时候已经想到要实现与POSIX(UNIX 的国际标准)的兼容问题了。
Linux 操作系统的诞生
1981 年IBM 公司推出享誉全球的微型计算机IBM PC。在1981-1991 年间,MS-DOS 操作系统一直是微型计算机上操作系统的主宰。此时计算机...
C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
arr[i-1] = key;
i--;
count++;
}
//将待插入的数定位到下一个元素,
//因为后面还要执行i++,所以这里不再加1
i += count;
}
}
}
/*
第二种代码形式
插入排序后的顺序为从小到大
*/
void Insert_Sort2(int *arr,int l...
代码块超过1.2w编译apk报错问题 - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!
...不好恢复老版本不验证了)
--------
怀疑 kawa Scheme 生成问题,更新新版本试试。(也不容易更新)
https://community.appinventor.mi ... or-d8-failed/141334
Permission denied on accessing host directory in Docker
...s script is:
# update the uid
if [ -n "$opt_u" ]; then
OLD_UID=$(getent passwd "${opt_u}" | cut -f3 -d:)
NEW_UID=$(stat -c "%u" "$1")
if [ "$OLD_UID" != "$NEW_UID" ]; then
echo "Changing UID of $opt_u from $OLD_UID to $NEW_UID"
usermod -u "$NEW_UID" -o "$opt_u"
if [ -n "$opt_r" ];...
What is the difference between a process and a thread?
... referring to. Threads are an operating environment feature, rather than a CPU feature (though the CPU typically has operations that make threads efficient).
Erlang uses the term "process" because it does not expose a shared-memory multiprogramming model. Calling them "threads" would imply that the...
What is data oriented design?
...our data for efficient processing. Especially with respect to cache misses etc. Data Driven Design on the other hand is about letting data control a lot of your programs behavior (described very well by Andrew Keith's answer).
Say you have ball objects in your application with properties such as co...
Sending HTML email using Python
... smtplib.SMTP('localhost')
s.starttls()
s.login(email_login,
email_passwd)
s.sendmail(msg['From'], [msg['To']], msg.as_string())
s.quit()
share
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技术人员如何创业《一》—— 产品及想法 - 资讯 - 清泛网 - 专注C/C++及内核技术
...品及想法:
什么是好的产品?一个朋友之前问到,这个问题要系统的回答还真有点不好说。看一下比较理论的解释,产品指一个能够满足用户的需求,我们能够使用可行的技术手段实现并且通过销售给用户给公司带来利润。好...
