1. What is the output of the following code and why? #include #include int sum; /*...

   

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1. What is the output of the following code and why? #include #include int sum; /* this data is shared by the thread(s) */ void "runner(void *param); /* the thread "/ main(int argc, char *argv[]) pthread_t tidl, tid; /* the thread identifier"/ pthread_attr_t attr; /* set of thread attributes"/ if (argc = 2) { fprintf(stderr, "usage: a.out "); exit(); } if (atoi(argv[1] < 0) { fprintf(stderr, "%d must be >= O ", atoi(argv[1])); } exit(): pthread_attr_init(&attr); create the threads"/ pthread_create(&tid,&attr,runner,argv[1]); pthread_create(&tidl,&attr,runner, argv[1]); } pthread_join(tid,NULL); pthread_join(tidl,NULL); printf(sum = %d .sum); /* The thread will begin control in this function"/ void "runner(void *param) { int upper atoi(param); int i; sum = 0; if (upper > 0) { for (i=1; i < upper; i++) sum += i; } pthread_exit(0); } 1. What is the output of the following code and why? #include #include int sum; /* this data is shared by the thread(s) */ void "runner(void *param); /* the thread "/ main(int argc, char *argv[]) pthread_t tidl, tid; /* the thread identifier"/ pthread_attr_t attr; /* set of thread attributes"/ if (argc = 2) { fprintf(stderr, "usage: a.out "); exit(); } if (atoi(argv[1] < 0) { fprintf(stderr, "%d must be >= O ", atoi(argv[1])); } exit(): pthread_attr_init(&attr); create the threads"/ pthread_create(&tid,&attr,runner,argv[1]); pthread_create(&tidl,&attr,runner, argv[1]); } pthread_join(tid,NULL); pthread_join(tidl,NULL); printf(sum = %d .sum); /* The thread will begin control in this function"/ void "runner(void *param) { int upper atoi(param); int i; sum = 0; if (upper > 0) { for (i=1; i < upper; i++) sum += i; } pthread_exit(0); }