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C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...增加与之相应的引用计数；对一个对象进行赋值时，赋值操作符减少左操作数所指对象的引用计数（如果引用计数为减至0，则删除对象），并增加右操作数所指对象的引用计数；调用析构函数时，构造函数减少引用计数（如果...
What and where are the stack and heap?
...d. The stack is always reserved in a LIFO (last in first out) order; the most recently reserved block is always the next block to be freed. This makes it really simple to keep track of the stack; freeing a block from the stack is nothing more than adjusting one pointer.
The heap is memory set asi...
Exit codes in Python
...wered Nov 12 '08 at 20:50
Dave CostaDave Costa
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...黑帮之间的通信中被阐明。 1978年，在Jim Gray的《数据库操作系统注意事项》一书中（从第465页开始）被命名为两个将军悖论。作为两个将军问题的定义和无解性的证明的来源，这一参考被广泛提及。
这个实验意在阐明：试图通...
How to terminate a python subprocess launched with shell=True
...ted to all of the child processes of this group.
Here's the code:
import os
import signal
import subprocess
# The os.setsid() is passed in the argument preexec_fn so
# it's run after the fork() and before exec() to run the shell.
pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,
...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...常会超出很多人的认知：如果服务实例崩溃但是承载它的操作系统正常工作，那么该操作系统仍然会正常响应负载平衡服务器所发出的Ping命令，只是此时TCP连接会失败；如果服务实例并没有崩溃，而只是挂起，那么它仍然可以...
Importing modules from parent folder
... edited Jan 12 '17 at 18:30
MERose
2,79255 gold badges3535 silver badges6060 bronze badges
answered Apr 3 '09 at 14:09
...
Why is creating a Thread said to be expensive?
...tem calls need to be made to create / register the native thread with the host OS.
Descriptors need to be created, initialized and added to JVM-internal data structures.
It is also expensive in the sense that the thread ties down resources as long as it is alive; e.g. the thread stack, any objects...
Linux equivalent of the Mac OS X “open” command [closed]
I've found the "open" command in Mac OS X very handy in the command line. From "man open":
7 Answers
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Proxies with Python 'Requests' module
...st.getproxies())
It works really well and urllib knows about getting Mac OS X and Windows settings as well.
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