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Why is volatile needed in C?
...erface with hardware that changes the value itself; when there's another thread running that also uses the variable; or when there's a signal handler that might change the value of the variable.
Let's say you have a little piece of hardware that is mapped into RAM somewhere and that has two address...
What is the difference between buffer and cache memory in Linux?
...ference between the two Linux memory concepts : buffer and cache . I've read through this post and it seems to me that the difference between them is the expiration policy:
...
Downloading images with node.js [closed]
...
fs.writeFileSync('image.png', data.read());
});
}).end();
The newest Node versions won't work well with binary strings, so merging chunks with strings i...
Difference between HBase and Hadoop/HDFS
...FS allows you store huge amounts of data in a distributed (provides faster read/write access) and redundant (provides better availability) manner. And MapReduce allows you to process this huge data in a distributed and parallel manner. But MapReduce is not limited to just HDFS. Being a FS, HDFS lack...
What is an alternative to execfile in Python 3?
...ation, instead of
execfile("./filename")
Use
exec(open("./filename").read())
See:
What’s New In Python 3.0
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When to use SELECT … FOR UPDATE?
...s without specifying FOR UPDATE explicitly.
To solve this problem, Thread 1 should SELECT id FROM rooms FOR UPDATE, thereby preventing Thread 2 from deleting from rooms until Thread 1 is done. Is that correct?
This depends on the concurrency control your database system is using.
MyISAM in...
What's the best way to learn LISP? [closed]
... in Python, PHP, Java and C for a couple or years now, and I just finished reading Hackers and Painters, so I would love to give LISP a try!
...
How to loop through file names returned by find?
....txt' -exec process {} \; (see the bottom of this post). If you have time, read through the rest to see several different ways and the problems with most of them.
The full answer:
The best way depends on what you want to do, but here are a few options. As long as no file or folder in the subtree...
How to secure MongoDB with username and password
...er(
{
user: "myNormalUser",
pwd: "xyz123",
roles: [ { role: "readWrite", db: "some_db" },
{ role: "read", db: "some_other_db" } ]
}
)
4) Stop the MongoDB instance and start it again with access control.
mongod --auth --dbpath /data/db
5) Connect and authenticate as ...
Easiest way to read from and write to files
There are a lot of different ways to read and write files ( text files , not binary) in C#.
12 Answers
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