{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 5-9-3 スレッド固有のデータ"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"in progress\"\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "\"in progress\""
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "thread = Thread.fork {\n",
    "  Thread.current[:status] = 'in progress'\n",
    "  sleep 0.5\n",
    "}\n",
    "\n",
    "sleep 0.1\n",
    "\n",
    "# シンボルと文字列どちらでも同じ値が取得できる.\n",
    "p thread[:status]\n",
    "thread['status']"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 5-9-4 ライフサイクル"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"sleep\"\n",
      "true\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "true"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "t = Thread.fork { sleep 1 }\n",
    "\n",
    "sleep 0.1\n",
    "\n",
    "p t.status\n",
    "p t.alive?\n",
    "t.stop?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 5-9-5 スレッドの操作"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\"sleep\"\n",
      "hi\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "#<Thread:0x0000563608766670@(pry):18 dead>"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "t = Thread.fork {\n",
    "  Thread.stop\n",
    "  puts 'hi'\n",
    "}\n",
    "\n",
    "sleep 0.1\n",
    "\n",
    "p t.status\n",
    "t.run"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 5-9-6 例外の扱い"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "t = Thread.fork { raise }\n",
    "# 元のスレッドで例外が発生する.\n",
    "t.join"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Thread#join 等を呼ばない場合は元スレッドで例外は上らない\n",
    "t = Thread.fork { raise }"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "t = Thread.fork {\n",
    "  begin\n",
    "    loop { }\n",
    "  ensure\n",
    "    puts 'ensureing...'\n",
    "  end\n",
    "}\n",
    "\n",
    "t.raise\n",
    "\n",
    "begin\n",
    "  t.join\n",
    "rescue\n",
    "  p t.status\n",
    "end"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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  "kernelspec": {
   "display_name": "Ruby 2.5.1",
   "language": "ruby",
   "name": "ruby"
  },
  "language_info": {
   "file_extension": ".rb",
   "mimetype": "application/x-ruby",
   "name": "ruby",
   "version": "2.5.1"
  }
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 "nbformat": 4,
 "nbformat_minor": 2
}