#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
void *thread_function(void *arg);
pthread_mutex_t work_mutex;
#define WORK_SIZE 1024
char work_area[WORK_SIZE];
int time_to_exit=0;
int main(int argc, char *argv[])
{
int res;
pthread_t a_thread;
void *thread_result;
res=pthread_mutex_init(&work_mutex,NULL);
if(res!=0)
{
printf("Mutex initialization failed\n");
exit(EXIT_FAILURE);
}
res=pthread_create(&a_thread,NULL,thread_function,NULL);
if(res!=0)
{
printf("Thread creation failed\n");
exit(EXIT_FAILURE);
}
pthread_mutex_lock(&work_mutex);
printf("Input some text. Enter ‘end‘ to finish\n");
while(!time_to_exit)
{
fgets(work_area,WORK_SIZE,stdin);
pthread_mutex_unlock(&work_mutex);
while(1)
{
pthread_mutex_lock(&work_mutex);
if(work_area[0]!=‘\0‘)
{
pthread_mutex_unlock(&work_mutex);
sleep(1);
}
else
break;
}
}
pthread_mutex_unlock(&work_mutex);
printf("\nWaitting for thread to finish...\n");
res=pthread_join(a_thread,&thread_result);
if(res!=0)
{
printf("Thread join failed\n");
exit(EXIT_FAILURE);
}
printf("Thread joined\n");
pthread_mutex_destroy(&work_mutex);
exit(EXIT_SUCCESS);
return 0;
}
void *thread_function(void *arg)
{
sleep(1);
pthread_mutex_lock(&work_mutex);
while(strncmp("end",work_area,3)!=0)
{
printf("You input %d characters\n",strlen(work_area)-1);
printf("the character is: %s",work_area);
work_area[0]=‘\0‘;
pthread_mutex_unlock(&work_mutex);
sleep(1);
pthread_mutex_lock(&work_mutex);
while(work_area[0]==‘\0‘)
{
pthread_mutex_unlock(&work_mutex);
sleep(1);
pthread_mutex_lock(&work_mutex);
}
}
time_to_exit=1;
work_area[0]=‘\0‘;
pthread_mutex_unlock(&work_mutex);
pthread_exit(0);
}