llist_test_threads.c

linux thread programe

/********************************************************
 * An example source module to accompany...
 *
 * "Using POSIX Threads: Programming with Pthreads"
 *     by Brad nichols, Dick Buttlar, Jackie Farrell
 *     O'Reilly & Associates, Inc.
 *
 ********************************************************
 * llist_test_threads.c --
 * 
 * Exercizer program using multi-threaded access to linked list 
 */
#include "llist_threads.h"
#include <stdio.h>
#include <stdlib.h>

#define MAXDATALEN 80

void *build_list (void *);

llist_t ll; 
int maxlen=MAXDATALEN;

extern int
main(void) {
  
  pthread_t       thread1, thread2;
  int             smallint1 = 2;
  int             smallint2 = 3;

  llist_init(&ll);
 
  pthread_create(&thread1, 
		 NULL,
		 build_list,
		 (void *) &smallint1); 

  pthread_create(&thread2, 
		 NULL, 
		 build_list,
		 (void *) &smallint2); 
  
  pthread_join(thread1, NULL);
  pthread_join(thread2, NULL);

  llist_show(&ll);

  return 0;
}


/*
 * build_list -- makes entries to the linked list
 *               using multiples of the input arg
 */
void *build_list (void *arg) {

  int *factorp = (int *)arg;
  unsigned int multiple;
  char *stringp;
  int i;

  for (i = 0; i < 1000; i++) {
    multiple = (*factorp) * i;
    stringp = malloc(maxlen);
    if (stringp == NULL) 
      perror("malloc");
    sprintf (stringp, "%d is a multiple of %d", multiple, *factorp);
    llist_insert_data(multiple, stringp, &ll);
  }
  return NULL;
}