How to create a process in Erlang
Processes in Erlang
Erlang processes are introduced to achieve high concurrency for program execution. These processes are lightweight and adjust according to the memory size (dynamically shrink and expand) with minimal footprints. Processes in Erlang are quick and easy to create and terminate with low scheduling overhead.
Process creation in Erlang
Let’s have a look at process creation in Erlang. In Erlang, processes are created by calling the spawn() method.
spawn(Module, Name, Args) -> pid()Module = Name = atom()Args = [X1,...,Xn]Xi = term()
The spawn() method creates a process and returns the process identifier PID.
On execution of spawn(), module: Name, starts with a list of arguments (primarily blank) provided in Args.
Example
-module(main).-export([main/0, showStr/1]).showStr(String) ->io:format("~p~n", [String]).main() ->spawn(main, showStr, [green]),spawn(main, showStr, [educative]).
Explanation
- Line 1: We use the
-module()method to create a module main to execute Erlang commands. - Line 3: We use the
-export()method to define the prototypes of the function we'll create with the number of arguments defined after/. - Line 6: The
showStr()method is defined with one parameter (string value to print). - Line 7: We use
io:formatto print in Erlang. We use~phere to print the index of the list, and~nis used to write a new line. - Line 9: The
main()method is defined to execute thespawn()method process call. - Lines 10–11: We use the
showStr()method to call twospawn()requests to create two concurrent processes in order to show the passed string.
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