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A Group Project of Operating Systems (COMP2432) subject at The Hong Kong Polytechnic University, made by CHEN Derun, LIU Minghao, YE Haowen, and ZHANG Wengyu

• CHEN Derun
• LIU Minghao
• YE Haowen
• ZHANG Wengyu

APpointment Organizer (APO), enables users to easily organize appointment among their friends.

PROJECT SCOPE:

• Process Management;
• Interprocess Communication and Programming;
• CPU Scheduling;
• Process Synchronization.

PROJECT CONCEPT:

• CPU scheduling algorithm: First Come First Serve, Priority;
• Interprocess communication, synchronization algorithm: Blocking Send and Blocking Receive.

SOFTWARE STRUCTURES: Containing three modules, Input Module, Scheduling Module, and Output Module.

• Input Module is the parent process who has two child processes for the other two modules. Input Module acts as a coordinator, who is responsible for storing all data structures, handling user input, mapping commands to corresponding functions, and sending and receiving messages between child process through pipe.
• Scheduling Module receives instructions and data from parent process to perform appointment scheduling, as well as sent result back through pipe.
• Output Module receives instructions and data from parent process to perform outputting the scheduled appointment information and corresponding analysis data.

PERFORMANCE ANALYSIS

• Environment: Linux
• File checklist:
  • G04_APO.c
  • cmd.txt
  • All_Requests.dat

gcc G04_APO.c -o G04_APO

• There are no additional libraries in the program, use the standard compilation statements.

./G04_APO [startDate] [endDate] [user1] [user2] ... [user10]

• For example (used in G04_tests.dat): ./G04_APO 20230501 20230531 paul mary lucy david jerry mike wayne
• The user needs to specify the start date, the end date and the names of all users involved in scheduling at the start of the program.
• The start and end dates need to be between "20230501" and "20230531", and the end date needs to be greater than the start date.
• The number of users needs to be greater than three and less than ten.
• These parameters which are established in the program start statement, cannot be changed during the program.
• Error message in run the program:
  • User Size out of Range [3,10], try again!
  • Time out of Range [20230501, 20230531], try again!

[type] [caller] [date] [startTime] [duration] [callee1] ... [callee9]

• For example: gathering lucy 20230504 1900 4.0 john paul mary
• There are four types of programs, in descending order of priority: privateTime, projectMeeting, groupStudy, gathering.
• All three commands except the privateTime accept several callee users from 1 to 9, while privateTime does not allow callee users.
• The date needs to be set between the startDate and endDate set in the start command.
• The caller and callee should be the subset of all users from start command.
• The startTime is specified as one slot of total five slots between 18:00 and 23:00,
• the duration cannot be "0" and the startTime plus the duration cannot be more than 23:00.

f [fileName]

• For example: f cmd.txt, or f All_Requests.dat
• When the command starts with f, the command line function is to read the fileName.
• The fileName needs to be in the correct format and exist under that folder.

printSchd [Algorithm]

• For example: printSchd PRIORITY
• Use the schedule command to invoke the corresponding Algorithm for scheduling,
• which includes FCFS, PRIORITY and ALL.
• The command also calls the Output Module to write the results of the Algorithm to a single file.
• The saved single file name will be shown in the command line.
• The single file contains
  • Appointment scheduling result for each user,
  • Rejected appointment list, and
  • Performance results.

• Event date out of range: entered appointment data is out of set data range
• Event time out of range: entered appointment time is out of set time range
• Event duration out of range: entered appointment duration is out of set time range
• Caller not found: entered appointment’s caller is not found among all users
• No callee can be in privateTime: callees are found in entered privateTime appointment
• At least one callee should be in this appointment: no callee in non-privateTime appointment
• Callee not found: entered appointment’s callees are not found among all users

endProgram

• This ends the program completely, upon collecting all the child processes and closing all the files.

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