erlang

I. Variables 1. The variable [Single Assignment] in Erlang means that the variable can be assigned only once. 2. The variable must start with an uppercase letter. Ii. Atom The atom is equivalent to the enumeration type in C ++, but the value of the atom in Erlang is itself. An atom is a string starting with a lower-case letter. However, if it is enclosed by single quotes, it doesn't matter if it is named. A

Erlang provides binary_to_term to convert binary data into original Erlang data. However, this function also has side effects. If you directly perform a binary_to_term operation on the data transmitted from the peer end, the VM crash may be dropped. Binary_to_term side effects This is because binary_to_term generates these atoms when binary data has Atomic values. However, the total number of VM atoms is li

Erlang Cowboy WebSocket ServerThe original text is:Http://marcelog.github.io/articles/erlang_websocket_server_cowboy_tutorial.htmlThis article is not a simple translation of the original text, is a reference to the original, according to my understanding and practice written. The source code of this article is:Https://github.com/marcelog/erws1 IntroductionErlang can be used to implement a WebSocket server. Cowboy such a framework can accomplish this t

original articles, reproduced please specify the Source: Server non-amateur research http://blog.csdn.net/erlib author SunfaceContact e-mail: [Email protected]ProcessesTrying to get a global view of processes was helpful when Trying to assess what much work was being done in the VMS in terms O F Tasks. A general good practice in Erlang are to use processes for truly concurrent activities-on Web servers, you'll usually g ET one process per request or c

In the previous article, the registration process associated atoms have global scope, where the global refers to the current Erlang virtual machine, in the distributed, is the current distributed node. Therefore, registering the process-associated atoms in one node cannot be used directly in another node, but must be used with the target node. Copy Code code as follows: {regname, Node}! {messages}. Example Start a Server node f

Baidu Cloud push to send official address Http://developer.baidu.com/wiki/index.php?title=docs/cplat/push Simple introduction of the following principle: Baidu Cloud push sends support for iOS and Android cloud push. Android support is good, but iOS is generally difficult to tune. Baidu Cloud for the iOS push, he just did a middle agent, to provide users with the interface, the advantage is to use Baidu Cloud Push, Android and iOS can be unified management; The disadvantage is: the communicati

PI is calculated mainly by Monte Carlo method. The code is as follows:1) pi.pl: $time 1 = Time (), foreach (1..20000000) { my ($x, $y) = (rand (), Rand ()); if (sqrt ($x * * 2 + $y * * 2) The Perl script runs as follows, and the average execution time for 20 million times is about 27 seconds: 2) pi.py Import randomimport Datetimeimport mathstarttime = Datetime.datetime.now () total = 0for I in Xrange (20000000): x, y = r Andom.random (), Random.random () if MATH.SQRT (x * * 2 + y * 2)

Compiling source code Download source code from Erlang website $ wget http://erlang.org/download/otp_src_19.1.tar.gzInstallation dependencies $ sudo yum install gcc gcc-c++ glibc-devel make ncurses-devel openssl-devel autoconf gitUnzip the first step of the download source code $ tar zxvf otp_src_19.1.tar.gzInstallation $ CD opt_src_19.1$./otp_build autoconf$./configure make sudo make installVerify $ erlInstall from Fedora Library (not recomme

1. Building the directory structureIn my example, the project folder is Bank1Ebin directory: storing compiled beam filesInclude directory: storing HRL filesSRC directory: Storing erl source Files2. Create a Emakefile fileAt compile time, the compiler will handle the Emakefile file as appropriate.{[' src/* '% specify the erl source file directory],[debug_info,{i, "include"} percent specifies the Include folder, {OutDir, "Ebin"} percent to specify the compiled beam file directory]}.2, write the co

Questions:When we put all the supervision tree in a project through a simple function game:start (), we find that the tree structure is particularly complex, with only one root node, and then it expands.Here, this is why application appears, designing a sub-block (application) that can be switched on at any time. For example: In the Log app, DB app, game app, connect app.So the switch management of these applications is very convenient, "Imagine if you use supervisor, the runtime also to manuall

See http://ecug.org/ You are welcome to spread this message everywhere. ----CN erlounge III-launch Time ~ , For 2 days Location: Shanghai (detailed address to be confirmed) Character: This is intended for the Erlang Chinese community, but it does not exclude anyone interested in topics such as Erlang, distributed, and multi-core. Topics: Erlang-rela

Here is an elang description: Erlang Quick Start Abstract: Erlang is not only a programming language, but also has some features closer to the operating system than the programming language: concurrent threads, Job Scheduling, memory management, distributed, and networking. It has a super lightweight process, which dynamically changes the memory requirements. Erlang