Introduction - If you have any usage issues, please Google them yourself
Creating four POSIX threads. Where two threads (A and B) were read 10 integer from 2 data files (data1.txt and data2.txt). Individually integer thread A and B to read from a file into a buffer pool. Cushion buffer pool constituted by n (n = 5, and can be easily adjusted to other values), each buffer can store an integer. Further two threads, C and D, the data is read from the buffer pool 10. Thread C, D 2 data is read out of each, and are obtained separately, or product thereof, and print output.