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HELLO WORLD
TODAY:09/08 
TODAY:09/08 
TODAY:09/08 
TODAY:09/08 
TODAY:09/08 
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HOW TO RUN
1. shmem_* : server and client processes will be share same memory area that can be writable and readable from both sides. 
 - Run 'shmem_server' first then run 'shmem_client' in another shell.
 - In 'shmem_server' side, write the message that you want to pass to 'shmem_client'.
 - Check the result of 'shmem_client' side.

2. mq_* : client process will be insert message into message queue and server will be print and pop out top of the queue.
 - Run 'mq_client' several times and run 'mq_server' to print out and pop out the top of message queue
 - If message queue is empty, 'mq_server' will print out message that 'empty queue'.
   ex) If you run 'mq_client' 3 times, 'mq_server' can print and pot out 3 times. 

3. sh_st_* : server and client share same int[] struct(number of array will be 256) via share memory. server can insert 'number' into 'index' array of shared int[] struct.    
 - Run 'sh_st_server' first then run 'sh_st_server'.
 - In 'sh_st_server' side, write 'number' and 'index' and check the result in 'sh_st_client' side.

4. mq_st_* : client send custom structure in message queue form to server.
 - Run 'mq_st_client' several times and run 'mq_st_server' to print and pop out the top of message queue
 - If message queue is empty, 'mq_st_server' will print out message that 'empty queue'.
   ex) If you run 'mq_st_client' 3 times, 'mq_st_server' can print and pot out 3 times. 

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