e5.c program to support threads. Make the program launch 4 threads
to compute the value of the data section in the same way that
does. The data section should be divided among the 4 threads, each thread
computing the value of each section, then using a mutex to protect the global
value variable each thread should add their sub-value to the global value.
Assuming you have 4 CPU cores in your system, the speedup should be almost linear with respect to the number of threads if you implemented it correctly.