1. Chapter 5 멀티스레드
u-Network Design
Lab 4

2. What is Multi-threading
A process is a running program.
You can run more than one process at a time. BUT they run as processes in their own separate memory space.
How to run a program in the same memory space as another running process?
Threads are a way for a program to split itself into two or more simultaneously (or pseudo- simultaneously) running tasks
These threads share resource and global variables.
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3. u-Network Design
Single Threaded
Multi Threaded

4. Question 1
Write a TCP Server Program to convert all received message from Client to UPPERCASE.
Send the UPPERCASE message back to client.
Modify Lab 3-Question 1 TCP Server Program to accept Multiple Clients.
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5. Sample Output Question 1
Client 1
Client 2
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Client 3

6. Question 2
Modify FileReceiver.cpp to allow multiple clients to send file at the same time.
[TCP Server] Client IP is connected.
[TCP Server] Client IP is Sending file[test] 19 bytes.
[TCP Server] Client IP is connected.
[TCP Server] Client IP is Sending file[a.hwp] 123 bytes.
[TCP Server] Client IP sent file[test] successfully.
[TCP Server] Client IP sent file[a.hwp] successfully.
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7. Question 3
Write a simple TCP User Authentication Program with multi-threading using _beginthreadex() and _endthreadex().
Client sends username to server.
Server replies the member’s status back to client.
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8. Sample Output Question 2
Enter your username: dongseo
…..Checking your status…….
======================
Username: dongseo
Status: Member
Enter your username: thread
Username: thread
Your status: Admin
Enter your username: udesign
Username : udesign
Your status: Non-member
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9. Thank you
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