1. Chapter 5 & 6 UDP 서버/클라이언트
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Lab 5

2. Thread Synchronization
Need Synchronization. Why ?
Share variable
Int Balance = 100
Thread 2
Thread 1
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Write
Write
Balance = Balance + 10;
Balance = Balance +40;

3. Question 1
Modify ExCriticalSection example to use Event as thread synchronization mechanism.
Important Functions
CreateEvent(…)
BOOL SetEvent (HANDLE hEvent)
Refer Text Book pg
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4. Sample Output Question 1
Without Thread Synchronization
With Thread Synchronization
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5. UDP server/client structure
socket()
bind()
recvfrom()
sendto()
closesocket()
UDP server
UDP client
network
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6. TCP vs UDP
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7. TCP vs UDP TCP Frame UDP Frame Heavyweight Lightweight
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TCP Frame
UDP Frame
Heavyweight
Lightweight

8. Question 2 Modify FileReceiver.cpp & FileSender.cpp to UDP base.
[UDP Server] Client IP is connected.
[UDP Server] Client IP is Sending file[test] 19 bytes.
[UDP Server] Client IP is connected.
[UDP Server] Client IP is Sending file[a.hwp] 123 bytes.
[UDP Server] Client IP sent file[test] successfully.
[UDP Server] Client IP sent file[a.hwp] successfully.
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9. Question 3 Modify Lab4-Q3 to UDP base
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.
Modify Lab4-Q3 to UDP base
Do you still need multi-threading ?
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10. Sample Output Question 3
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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11. Thank you
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