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Transcript of 2010/12/12 [email protected] [email protected].
fruit store’s stock system
PurposeTo practice the “producer & consumer”
concept, which requires students to use pthread and at the same time use mutual exclusion. –Chapter 6
To understand why we need to design multi-threads program by practicing odd-even algorithm.
Key words: pthread, producer & consumer, Key words: pthread, producer & consumer, mutual exclusion, odd-even algorithm.mutual exclusion, odd-even algorithm.
IntroductionThis program simulate a fruit store’s stock
system.First, purchase different kinds of fruits and
record all the orders.Second, classify them into different
department.At last, sort them by given properties.
In this project, you need to use pthread to implement a program with producer & consumer concepts and the odd-even algorithm.
RequirementGiven different input files with tagged data,
students have to output the correct order by sorting.
Needs to implement the pthread with producer & consumer concepts and odd-even algorithm.
During your demonstration, students needs to fix their program instructed by given requirements.
Input Command format
apple orange grape
1.txt 2.txt 3.txt
buffer
Input #1
Input #2
Input #3
Basket #1
Basket #2
Basket #3
Output
command
P1
P2
P3
C1
C2
C3
Odd-EvenSorting
Date flow
Requirement- Part I Mutual
Exclusion
buffer
Apple
Orange
Appele
Grape
Grape
Orange
Apple
Orange
Input #1
Input #2
Input #3
Input #4
Producer #1
Producer #2
Producer #3
Producer #4
Requirement-Part IIMutual Exclusion
buffer
Apple
Orange
Appele
Grape
Grape
Orange
Apple
Orange
Basket #1
Basket #3
Basket #2
Consumer #1
Consumer #2
Consumer #3
Consumer #3
Requirement- Part III
Basket #1
Basket #2
Basket #3
Output #1
Output #2
Output #3
Odd-EvenSorting
Input files format(1.txt)Tag(Type) date amount Price
Example
buffer
Input #1
Input #2
Input #3
Basket #1
Basket #2
Basket #3
Output
command
P1
P2
P3
C1
C3
Odd-EvenSorting
O
C2
OutputOutput #1
Example
apple orange grape
1.txt 2.txt 3.txt
Each consumer need to sort the fruit by assign properties(date 、 amount 、 price), and write to the output file
Use Odd-even transposition sort
Sorting
buffer
Input #1
Input #2
Input #3
Basket #1
Basket #2
Basket #3
command
P1
P2
P3
C1
C2
C3
Odd-EvenSorting
OutputOutput
Output #1
O O O O
Example- Output
apple.txt
orange.txt
grape.txt
Odd-Even Transposition SortOdd-Even Transposition Sort functions by
comparing all indexed pairs of adjacent elements in the list and, if a pair is in the wrong order the elements are switched. The next step repeats this for indexed pairs Then it alternates between and steps until the list is sorted. It can be thought of as using parallel processors, each using bubblesort but starting at different points in the list.
Odd-Even Transposition Sort1st sort(even):
2nd sort(odd):
Odd-Even Transposition SortAfter sorting
origin
step1
step2
step3
step4
step5
step6
Example - Input
1.txt
2.txt
3.txt
Example- Output
apple.txt
orange.txt
grape.txt
GradesProgram(40%)
Compile and Run(10%)Correctness(30%)
Code(50%)Producer & consumer(20%)Mutual Exclusion(10%)Buffer ‘s structure(10%)Odd-even transposition sort(10%)Bonus
Report (10%)
Notice:Individual workDemo date( deadline as well) 1/17-1/19,
depends on the time you register for demo.Needs to demo on workstation.
Reminder(1/3)apple, orange, grape是指不同的水果 (籃子 )，跟
input裡頭的名稱會對應且一致，也就是分放到不同籃子的依據。
input檔案沒有硬性規定數量，根據 input的檔案數量，就產生多少的 producer來處理 input檔案 (每個producer只處理一個 input file，把所有資訊丟到同一個 buffer 中 )
Reminder(2/3)整體流程大致上是：
1. 主執行緒main()讀入參數
2. 主執行緒根據 input files個數產生對應數量的producer，每個 producer擁有其中一個檔案 (指標或名稱 )，並讀取該檔案的內容，將每一個水果資料放到共用的 Buffer中
Reminder(3/3)3. 主執行緒根據水果種類個數產生對應數量的 consumer，每個 consumer負責取一種水果到籃子裡 (也就是從共用的 Buffer讀取資料，若是 B該筆水果資料屬於自己負責，就從 Buffer取出，放到籃子裡，這裡的籃子，可以是每個 consumer的區域變數 )
4. producer 和 consumer執行期間， producer從檔案取資料丟到 buffer ， consumer 從 buffer取資料出來丟到籃子裡，直到 Buffer中的水果都處理完。
5. Buffer的水果都取出之後，才開始進行排序。
ReferenceChapter 6 Project- Producer & ConsumerOdd-Even Sort
http://en.wikipedia.org/wiki/Odd-even_sorthttp://en.wikipedia.org/wiki/Bubble_sort
