#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <semaphore.h>
void *thread_func(void *);
sem_t bin_sem;
#define WORK_SIZE 1024
char work_area[WORK_SIZE];
int main(void) {
int res;
pthread_t a_thread;
void *thread_res;
res = sem_init(&bin_sem, 0, 0);
if(res != 0){
perror("semaphore initilization failed");
exit(EXIT_FAILURE);
}
res = pthread_create(&a_thread, NULL, thread_func, NULL);
if(res != 0){
perror("Thread creation failed");
exit(EXIT_FAILURE);
}
printf("Input some text. Enter 'end' to finish\n");
while(strncmp("end", work_area, 3) != 0){
fgets(work_area, WORK_SIZE, stdin);
sem_post(&bin_sem);
}
printf("\n Waiting for thread to finish... \n");
res = pthread_join(a_thread, &thread_res);
if(res != 0){
perror("Thread join failed");
exit(EXIT_FAILURE);
}
printf("Thread joined\n");
sem_destroy(&bin_sem);
exit(EXIT_SUCCESS);
}
void *thread_func(void *arg)
{
sem_wait(&bin_sem);
while(strncmp("end", work_area, 3) != 0){
printf("Your input is %s, len is %d characters\n", work_area, strlen(work_area)-1);
sem_wait(&bin_sem);
}
pthread_exit("exit pthread now");
}