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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，...
How to create a GUID/UUID in Python
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The uuid module, in Python 2.5 and up, provides RFC compliant UUID
generation. See the module docs and the RFC for details. [source]
Docs:
Python 2: http://docs.python.org/2/library/uuid.html
Python 3:
https://docs.python....
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展之：RequestMTU是否有上限？ -...
RequestMTU
没反应,是不是因为这个值1024太大了
1024没触发,64触发了
MTU设64不报错,设100报错 128报错.256不报错.
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连上后，调用，没有触发回调？
待调查研究这个函数是否有上限。
When should I use uuid.uuid1() vs. uuid.uuid4() in python?
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uuid1() is guaranteed to not produce any collisions (under the assumption you do not create too many of them at the same time). I wouldn't use it if it's important that there's no connection between the uuid and the computer,...
How can I use UUIDs in SQLAlchemy?
Is there a way to define a column (primary key) as a UUID in SQLAlchemy if using PostgreSQL (Postgres)?
9 Answers
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Is there any difference between a GUID and a UUID?
...und, and I was wondering if there are any differences between a GUID and a UUID?
6 Answers
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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...
App Inventor 2 连接打印机（Printer），自定义打印的实现 - App Inventor ...
...”组件将数据分享给网络打印机App，这种实现思路。
蓝牙及串口打印机，需要研究打印机的数据协议（不同品牌协议有差别），暂时不在本文讨论范围。
信息分享器组件介绍
三种分享方式的效果，以邮件App测试为例...
nsis指定默认安装路径，记住上次安装路径 - 更多技术 - 清泛网 - 专注C/C++...
nsis指定默认安装路径，记住上次安装路径!define PRODUCT_DEFAULT_PATH "C: Test"....InstallDir "${PRODUCT_DEFAULT_PATH}"InstallDirRegKey HKLM "Software Microsoft Windo...!define PRODUCT_DEFAULT_PATH "C:\Test"
....
InstallDir "${PRODUCT_DEFAULT_PATH}"
InstallDirRegKey HKLM "Softwar...
Create a GUID in Java
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Have a look at the UUID class bundled with Java 5 and later.
For example:
If you want a random UUID you can use the randomUUID method.
If you want a UUID initialized to a specific value you can use the UUID constructor or the fromString met...