init

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+process_communication-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

README.md

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+# Для запуска
+
+```bash
+mix run -e "ProcessCommunication.run()"
+```
+
+# Вывод
+```text
+info 7
+cast 17
+call 31
+Rusult: 55
+```

lib/process_communication.ex

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+defmodule Child do
+  def start_link do
+    GenServer.start_link(__MODULE__, [])
+  end
+
+  def init(_args) do
+    {:ok, 0}
+  end
+
+  def handle_info({:info, n}, state) do
+    IO.puts "info #{n}"
+    {:noreply, state + n}
+  end
+
+  def handle_cast({:cast, n}, state) do
+    IO.puts "cast #{n}"
+    {:noreply, state + n}
+  end
+
+  def handle_call({:call, n}, _from, state) do
+    IO.puts "call #{n}"
+    {:reply, state + n, state + n}
+  end
+end
+
+defmodule ProcessCommunication do
+  def run do
+    {:ok, child} = Child.start_link()
+
+    send(child, {:info, 7})
+    GenServer.cast(child, {:cast, 17})
+    result = GenServer.call(child, {:call, 31})
+
+    IO.puts "Rusult: #{result}"
+  end
+end

mix.exs

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+defmodule ProcessCommunication.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :process_communication,
+      version: "0.1.0",
+      elixir: "~> 1.14",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end