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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...sy_list_t *request_list_node，用于将easy_request_t串起来
easy_list_for_each_entry_safe(r, rn, request_list, request_list_node)
{
//r指向链表中第一个easy_request_t元素
//rn指向链表中第二个easy_request_t元素
}
这里用到easy_list_for_each_entry_safe和easy_list_e...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...e to do a setup and teardown to make something happen. A very good example for this is the situation where you want to gain a handler to a file, read data from the file and the close the file handler.
有一些任务，可能事先需要设置，事后做清理工作。对于这种场景，Python...
How to make a variadic macro (variable number of arguments)
...
I don't think C99 requires the ## before VA_ARGS. That might just be VC++.
– Chris Lutz
Mar 25 '09 at 2:18
98
...
Traverse a list in reverse order in Python
... reversed() function:
>>> a = ["foo", "bar", "baz"]
>>> for i in reversed(a):
... print(i)
...
baz
bar
foo
To also access the original index, use enumerate() on your list before passing it to reversed():
>>> for i, e in reversed(list(enumerate(a))):
... print(...
When I catch an exception, how do I get the type, file, and line number?
...
Simplest form that worked for me.
import traceback
try:
print(4/0)
except ZeroDivisionError:
print(traceback.format_exc())
Output
Traceback (most recent call last):
File "/path/to/file.py", line 51, in <module>
...
Qt: can't find -lGL error
...
@Cuadue: The GL in the error and in libgl1-... is for OpenGL, a fundamental dependency of Qt 5.x. This is a common error for devs when setting up for Qt development -- but once they install the OpenGL development lib they never see it again.
– pixelgrea...
How do I convert between big-endian and little-endian values in C++?
... do the following: You include intrin.h and call the following functions:
For 16 bit numbers:
unsigned short _byteswap_ushort(unsigned short value);
For 32 bit numbers:
unsigned long _byteswap_ulong(unsigned long value);
For 64 bit numbers:
unsigned __int64 _byteswap_uint64(unsigned __int64 ...
What's the difference between using CGFloat and float?
...d to use CGFloat all over the place, but I wonder if I get a senseless "performance hit" with this. CGFloat seems to be something "heavier" than float, right? At which points should I use CGFloat, and what makes really the difference?
...
Adding a Method to an Existing Object Instance
...dule>
AttributeError: A instance has no attribute 'barFighters'
More information can be found by reading about descriptors and metaclass programming.
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How to parse/read a YAML file into a Python object? [duplicate]
...
If your YAML file looks like this:
# tree format
treeroot:
branch1:
name: Node 1
branch1-1:
name: Node 1-1
branch2:
name: Node 2
branch2-1:
name: Node 2-1
And you've installed PyYAML like this:
pip in...