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select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...1、select实现
select的调用过程如下所示：
（1）使用copy_from_user从用户空间拷贝fd_set到内核空间
（2）注册回调函数__pollwait
（3）遍历所有fd，调用其对应的poll方法（对于socket，这个poll方法是sock_poll，sock_poll根据情况会调用到...
How to remove array element in mongodb?
...
Try the following query:
collection.update(
{ _id: id },
{ $pull: { 'contact.phone': { number: '+1786543589455' } } }
);
It will find document with the given _id and remove the phone +1786543589455 from its contact.phone array.
You can use $unset to unset the value ...
Creating functions in a loop
...cated way which involved using a closure as a "function factory":
def make_f(i):
def f():
return i
return f
and in your loop use f = make_f(i) instead of the def statement.
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...
python location on mac osx
...ew install - ofc)
your file is located in:
/usr/local/Cellar/python/3.6.4_4/bin/python3
How do you know?
Run:
which python3
You should get:
/usr/local/bin/python3
Now this is a symbolic link, how do you know? Run:
ls -al /usr/local/bin/python3
and you'll get:
/usr/local/bin/python3 -...
Static methods in Python?
...staticmethod decorator
class MyClass(object):
@staticmethod
def the_static_method(x):
print(x)
MyClass.the_static_method(2) # outputs 2
Note that some code might use the old method of defining a static method, using staticmethod as a function rather than a decorator. This should o...
How to make rounded percentages add up to 100%
...sion using underscorejs:
function foo(l, target) {
var off = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0);
return _.chain(l).
sortBy(function(x) { return Math.round(x) - x }).
map(function(x, i) { return Math.round(x) + (off > i) - (i &...
Find merge commit which include a specific commit
... merge commits in the history line between c and master:
git log <SHA-1_for_c>..master --ancestry-path --merges
This will however also show all the merges that happened after h, and between e and g on feature.
Comparing the result of the following commands:
git rev-list <SHA-1_for_c&...
Python date string to date object
...<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/_strptime.py", line 308, in _strptime
format_regex = _TimeRE_cache.compile(format)
File "/usr/local/lib/python2.7/_strptime.py", line 265, in compile
return re_compile(self.pattern(format), IGNORECASE)
File "/usr/...
What's the difference between Spring Data's MongoTemplate and MongoRepository?
...ed Nov 12 '19 at 19:18
temporary_user_name
29.3k3939 gold badges113113 silver badges180180 bronze badges
answered Jun 9 '13 at 14:30
...
What's the algorithm to calculate aspect ratio?
...store.steampowered.com/hwsurvey, section 'Primary Display Resolution'
steam_file = './steam.txt'
# Taken from http://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Vector_Video_Standards4.svg/750px-Vector_Video_Standards4.svg.png
accepted_ratios = ['5:4', '4:3', '3:2', '8:5', '5:3', '16:9', '17:...