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Linux进程与线程总结 [推荐] - C/C++ - 清泛网 - 专注C/C++及内核技术
...即一个信号量最多可以被锁住n次，其中n是信号量产生时指定的，当某线程试图对该信号量进行第n+1次加锁，则该线程将会发生阻塞，直到前n次加锁中任意一次释放该信号量。信号量可以看作是容量为1的特殊的互斥量。另外，...
UIDevice uniqueIdentifier deprecated - What to do now?
...
A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time.
But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-ins...
UUID max character length
We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char leng...
Generate a random alphanumeric string in Cocoa
...yourself to hex characters only, then the simplest option is to generate a UUID:
NSString *uuid = [NSUUID UUID].UUIDString;
Example output: 16E3DF0B-87B3-4162-A1A1-E03DB2F59654.
If you want a smaller random string then you can grab just the first 8 characters.
It's a version 4 UUID which means ...
Likelihood of collision using most significant bits of a UUID in Java
If I'm using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right?
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How to generate a random alpha-numeric string?
...less likely than undetected errors from cosmic rays, etc.
Comparison with UUIDs
According to their specification, UUIDs are not designed to be unpredictable, and should not be used as session identifiers.
UUIDs in their standard format take a lot of space: 36 characters for only 122 bits of entro...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
...泛网 关于我们 免责申明 联系我们 手机版 IT搜索 下载栏目 图片栏目 网站地图 IT技术 C/C++ 开源 & Github 数据库(内核) 大数据 & AI 其他 IT专题 还在用Java开发安卓App？你out啦！ 轻松创APP ...
苹果全球开发者大会：无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...
...i会提醒你应该出发的时间。iOS 9还将提供更深层面的信息搜索，苹果甚至提供了搜索的API接口，这样用户可以搜索到APP内部的信息等更多内容。
在日常使用方面iOS 9将提供更为智能的体验，当你早上拿起iPhone的第一时间，它会...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
... ：不检查复制过滤器，建议启用。后面可以用--databases来指定需要检查的数据库。 --no-check-binlog-format : 不检查复制的binlog模式，要是binlog模式是ROW，则会报错。 --replicate-check-only :只显示不同步的信息。 --replicate= ：把checks...
nsis指定默认安装路径，记住上次安装路径 - 脚本技术 - 清泛IT论坛，有思想...
...ws\CurrentVersion\App Paths\Test.exe" "Path"
InstallDir 指定$INSTDIR值为"C:\Test"；InstallDirRegKey 指定$INSTDIR值为注册表中的键值。
后面的设置覆盖前面的。