/******************************************************** * An example source module to accompany... * * "Using POSIX Threads: Programming with Pthreads" *     by Brad nichols, Dick Buttlar, Jackie Farrell *     O'Reilly & Associates, Inc. * ******************************************************** * simple.c * * Simple serial example.  Calls three procedures. */#include <stdio.h>void do_one_thing(int *);void do_another_thing(int *);void do_wrap_up(int, int);int r1 = 0, r2 = 0;extern intmain(void){    do_one_thing(&r1);    do_another_thing(&r2);  do_wrap_up(r1, r2);   return 0; }void do_one_thing(int *pnum_times){  int i, j, x;    for (i = 0;  i < 4; i++) {    printf("doing one thing\n");    for (j = 0; j < 10000; j++) x = x + i;    (*pnum_times)++;  }}void do_another_thing(int *pnum_times){  int i, j, x;    for (i = 0;  i < 4; i++) {    printf("doing another \n");     for (j = 0; j < 10000; j++) x = x + i;    (*pnum_times)++;  }}void do_wrap_up(int one_times, int another_times){  int total;  total = one_times + another_times;  printf("All done, one thing %d, another %d for a total of %d\n",	one_times, another_times, total);}