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What exactly is a reentrant function?
...m;
void foo(callback f)
{
m.lock();
// use the resource protected by the mutex
if (f) {
f();
}
// use the resource protected by the mutex
m.unlock();
}
Another function could well need to lock the same mutex:
void bar()
{
foo(nullptr);
}
At first sight, ev...
How to Sort Multi-dimensional Array by Value?
How can I sort this array by the value of the "order" key? Even though the values are currently sequential, they will not always be.
...
How does one write code that best utilizes the CPU cache to improve performance?
...s
Organize your data to avoid alignment holes (sorting your struct members by decreasing size is one way)
Beware of the standard dynamic memory allocator, which may introduce holes and spread your data around in memory as it warms up.
Make sure all adjacent data is actually used in the hot loops. Ot...
Completely cancel a rebase
...t 2.12, Q1 2017) have git rebase --quit
See commit 9512177 (12 Nov 2016) by Nguyễn Thái Ngọc Duy (pclouds).
(Merged by Junio C Hamano -- gitster -- in commit 06cd5a1, 19 Dec 2016)
rebase: add --quit to cleanup rebase, leave everything else untouched
There are occasions when you de...
How to merge two files line by line in Bash
I have two text files, each of them contains an information by line such like that
4 Answers
...
MySQL Results as comma separated list
...ite_list
FROM sites s
INNER JOIN publications p ON(s.id = p.site_id)
GROUP BY p.id, p.name;
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What does “abstract over” mean?
...
In algebra, as in everyday concept formation, abstractions are formed by grouping things by some essential characteristics and omitting their specific other characteristics. The abstraction is unified under a single symbol or word denoting the similarities. We say that we abstract over the diff...
Why does Hibernate require no argument constructor?
...instances of objects that don't have a public no-arg constructor, but only by running in a so-called "enhanced" mode which is available only on certain VMs. (See the link for details.) Hibernate's designers surely chose to maintain compatibility with all VMs and so avoids such tricks, and uses the o...
Find the Smallest Integer Not in a List
...ly and for every index write the value at the index to the index specified by value, recursively placing any value at that location to its place and throwing away values > N. Then go again through the array looking for the spot where value doesn't match the index - that's the smallest value not i...
multiprocessing: How do I share a dict among multiple processes?
...actions available for your use case - shared state that's treated as local by use of proxies or shared memory: http://docs.python.org/library/multiprocessing.html#sharing-state-between-processes
Relevant sections:
http://docs.python.org/library/multiprocessing.html#shared-ctypes-objects
http://do...