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{
"metadata": {
"name": "",
"signature": "sha256:0815ba2045ff6b90ad464c5410843a3c00d29eb193c3c9a13b08fcf0be33a42e"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 12: Multithreaded Programming"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 12.1, page no. 211"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\"\"\"\n",
"note: the output will differ from that given in textbook as Threading in Python differs from that in J\n",
"\"\"\"\n",
"\n",
"\n",
"def threadA():\n",
" for i in range(1, 6):\n",
" print \"From Thread A: i = \", i\n",
" print \"Exit from A\"\n",
"\n",
"def threadB():\n",
" for i in range(1, 6):\n",
" print \"From Thread B: i = \", i\n",
" print \"Exit from B\"\n",
"\n",
"def threadC():\n",
" for i in range(1, 6):\n",
" print \"From Thread C: i = \", i\n",
" print \"Exit from C\"\n",
"\n",
"thread1 = Thread(target=threadA, args=())\n",
"thread2 = Thread(target=threadB, args=())\n",
"thread3 = Thread(target=threadC, args=())\n",
"\n",
"thread1.start()\n",
"thread2.start()\n",
"thread3.start()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From Thread C: i = 1\n",
"From Thread C: i = 2\n",
"From Thread C: i = 3\n",
"From Thread C: i = 4\n",
"From Thread C: i = 5\n",
"Exit from C\n",
"From Thread A: i = 1\n",
"From Thread A: i = 2\n",
"From Thread A: i = 3\n",
"From Thread A: i = 4\n",
"From Thread A: i = 5\n",
"Exit from A\n",
"From Thread B: i = 1\n",
"From Thread B: i = 2\n",
"From Thread B: i = 3\n",
"From Thread B: i = 4\n",
"From Thread B: i = 5\n",
"Exit from B\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 12.2, page no. 217"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\"\"\"\n",
"there is no yield or stop function for threads in Python. Demonstrating just sleep() function\n",
"\"\"\"\n",
"\n",
"from threading import Thread\n",
"\n",
"import time\n",
"\n",
"def threadA():\n",
" for i in range(1, 6):\n",
" print \"From Thread A: i = \", i\n",
" print \"Exit from A\"\n",
"\n",
"def threadB():\n",
" for i in range(1, 6):\n",
" print \"From Thread B: i = \", i\n",
" print \"Exit from B\"\n",
"\n",
"def threadC():\n",
" for i in range(1, 6):\n",
" print \"From Thread C: i = \", i\n",
" time.sleep(0.5)\n",
" print \"Exit from C\"\n",
"\n",
"thread1 = Thread(target=threadA, args=())\n",
"thread2 = Thread(target=threadB, args=())\n",
"thread3 = Thread(target=threadC, args=())\n",
"\n",
"thread1.start()\n",
"time.sleep(0.5)\n",
"thread2.start()\n",
"time.sleep(0.5)\n",
"thread3.start()\n",
"time.sleep(0.5)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From Thread A: i = 1\n",
"From Thread A: i = 2\n",
"From Thread A: i = 3\n",
"From Thread A: i = 4\n",
"From Thread A: i = 5\n",
"Exit from A\n",
"From Thread B: i = 1\n",
"From Thread B: i = 2\n",
"From Thread B: i = 3\n",
"From Thread B: i = 4\n",
"From Thread B: i = 5\n",
"Exit from B\n",
"From Thread C: i = 1\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#There is no way you can set priority for a thread in Python. Hence, example 12.3 is avoided"
],
"language": "python",
"metadata": {},
"outputs": []
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 12.4, page no. 225"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\"\"\"\n",
"There is no runnable interface in Python. Will use normal threading instead\n",
"\"\"\"\n",
"\n",
"import threading\n",
"class X(threading.Thread):\n",
" def run(self):\n",
" for i in range(1, 11):\n",
" print \"ThreadX: \", i\n",
" print \"End of ThreadX\"\n",
"\n",
"runnable = X()\n",
"threadx = Thread()\n",
"threadx.start()\n",
"print \"End of main thread\"\n",
"runnable.run()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"End of main thread\n",
"ThreadX: 1\n",
"ThreadX: 2\n",
"ThreadX: 3\n",
"ThreadX: 4\n",
"ThreadX: 5\n",
"ThreadX: 6\n",
"ThreadX: 7\n",
"ThreadX: 8\n",
"ThreadX: 9\n",
"ThreadX: 10\n",
"End of ThreadX\n"
]
}
],
"prompt_number": 69
}
],
"metadata": {}
}
]
}
|
