Question: Write a program to create a mmap() that is shared by multiple threads. Use fstat() to obtain the size of the mapped file to size

Write a program to create a mmap() that is shared by multiple threads. Use fstat() to obtain the size of the mapped file to size the mapping. Find out the number of logical processors (or cores) available programmatically by calling sysconf(), as shown, and display this number.

int numCPU = sysconf(_SC_NPROCESSORS_ONLN);

For this exercise, however, you are going to create four (4) threads only. Every thread should see the mapping. Each thread will display separate partial contents (sb.st_size/4 bytes) of the file.

Finally, unmap and close the file.

Please make sure your code is working before answer this question. And also please show the command line to compile and the screenshots of the running code

Please Do NOT answer this question with handwritten version

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