?? twordcount1.c
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/* twordcount1.c - threaded word counter for two files. Version 1 */#include <stdio.h>#include <pthread.h>#include <ctype.h>int total_words ;main(int ac, char *av[]){ pthread_t t1, t2; /* two threads */ void *count_words(void *); if ( ac != 3 ){ printf("usage: %s file1 file2\n", av[0]); exit(1); } total_words = 0; pthread_create(&t1, NULL, count_words, (void *) av[1]); pthread_create(&t2, NULL, count_words, (void *) av[2]); pthread_join(t1, NULL); pthread_join(t2, NULL); printf("%5d: total words\n", total_words);}void *count_words(void *f){ char *filename = (char *) f; FILE *fp; int c, prevc = '\0'; if ( (fp = fopen(filename, "r")) != NULL ){ while( ( c = getc(fp)) != EOF ){ if ( !isalnum(c) && isalnum(prevc) ) total_words++; prevc = c; } fclose(fp); } else perror(filename); return NULL;}
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