The program shown below uses the Pthreads API. Run the program and find out what the output are at LINE C and LINE P.

Add a second thread to the program above replicating the child process part for the new thread. Execute your code three times and record the output and explain why you get those results.
 

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#include <pthread.h> #include <stdio.h> int value = 0; void *runner (void *param); /* the thread */ int main(int argc, char *argv[]) { pid_t pid; pthread_t tid; pthread_attr_t attr; pid = fork(); if (pid == 0) { /* child process */ pthread_attr_init(&attr); pthread create(&tid, &attr, runner,NULL); } else if (pid gt; 0) { /* parent process */ wait (NULL); printf("PARENT: value = %d", value); /* LINE P */ } pthread_join(tid, NULL); printf("CHILD: value = %d", value); /* LINE C */ } } void *runner (void *param) { value= 5; pthread_exit(0); #include <pthread.h> #include <stdio.h> int value = 0; void *runner (void *param); /* the thread */ int main(int argc, char *argv[]) { pid_t pid; pthread_t tid; pthread_attr_t attr; pid = fork(); if (pid == 0) { /* child process */ pthread_attr_init(&attr); pthread create(&tid, &attr, runner,NULL); } else if (pid gt; 0) { /* parent process */ wait (NULL); printf("PARENT: value = %d", value); /* LINE P */ } pthread_join(tid, NULL); printf("CHILD: value = %d", value); /* LINE C */ } } void *runner (void *param) { value= 5; pthread_exit(0);

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