使用互斥量实现线程间同步

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <semaphore.h>

#define SIZE 1024
char buffer[SIZE];

void *thread_function(void *arg);
pthread_mutex_t mutex;

int main()
{
int res;
pthread_t a_thread;
void *thread_result;

res = pthread_mutex_init(&mutex, NULL);
if (res != 0)
{
perror("Mutex init failed!");
exit(EXIT_FAILURE);
}

res = pthread_create(&a_thread, NULL, thread_function, NULL);
if (res != 0)
{
perror("Thread create failed!");
exit(EXIT_FAILURE);
}

printf("Input some text. Enter 'end' to finish/n");

while (1)
{
pthread_mutex_lock(&mutex);
scanf("%s", buffer);
pthread_mutex_unlock(&mutex);
if (strncmp("end", buffer, 3) == 0)
break;
sleep(1);
}

res = pthread_join(a_thread, &thread_result);
if (res != 0)
{
perror("Thread join failed!");
exit(EXIT_FAILURE);
}

printf("Thread joined/n");

pthread_mutex_destroy(&mutex);

exit(EXIT_SUCCESS);
}

void *thread_function(void *arg)
{
sleep(1);

while (1)
{
pthread_mutex_lock(&mutex);
printf("You input %d characters/n", strlen(buffer));
pthread_mutex_unlock(&mutex);
if (strncmp("end", buffer, 3) == 0)
break;
sleep(1);
}
}