Add omp_hello

omp_hello.c

+#include <stdio.h> 
+#include <stdlib.h> 
+#include <omp.h> 
+ 
+void Hello(void); /* Thread function */ 
+ 
+int main(int argc, char *argv[]) { 
+	int thread_count = strtol(argv[1], NULL, 10); 
+ 
+	#pragma omp parallel num_threads(thread_count) 
+	Hello(); 
+ 
+	return 0; 
+} 
+ 
+void Hello(void) { 
+	int my_rank = omp_get_thread_num(); 
+	int thread_count = omp_get_num_threads(); 
+ 
+	printf("Hello from thread %d of %d\n", 
+		my_rank, thread_count); 
+}
+