utility.h
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utility.h
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			/*
			============================================================================
			Filename : utility.h
			Author : Arash Pourhabibi
			============================================================================
			*/

			#include <omp.h>
			#include <time.h>
			#include <sys/time.h>

			struct timeval start, end;

			typedef struct rand_gen {
			unsigned short * seed;
			double (*rand_func) (struct rand_gen);

			} rand_gen;

			void set_clock(){
			gettimeofday(&start, NULL);
			}

			double elapsed_time(){
			gettimeofday(&end, NULL);

			double elapsed = (end.tv_sec - start.tv_sec);
			elapsed += (double)(end.tv_usec - start.tv_usec) / 1000000.0;
			return elapsed;
			}

			// Gives a random number between 0 and 1
			double next_rand(rand_gen gen){
			return erand48(gen.seed);
			}

			rand_gen init_rand(){
			unsigned short * seed_array = malloc (sizeof (unsigned short) * 3);
			seed_array[0] = 5;
			seed_array[1] = 10;
			seed_array[2] = omp_get_thread_num();

			rand_gen gen;
			gen.seed = seed_array;
			gen.rand_func = next_rand;

			return gen;
			}

			void free_rand(rand_gen gen){
			free(gen.seed);
			}