#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 "); exit(EXIT_FAILURE); } res=pthread_create(&a_thread,NULL,thread_function,NULL); if(res!=0) { printf("Thread creation failed "); exit(EXIT_FAILURE); } pthread_mutex_lock(&work_mutex); printf("Input some text. Enter 'end' to finish "); 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]!='