互斥锁使用（生产者和消费者）

#include 
#include 
#include 
#include 

#include 
#include 
#include 
#include 

#define ERR_EXIT(m) \
        do \
        { \
                perror(m); \
                exit(EXIT_FAILURE); \
        } while(0)

#define CONSUMERS_COUNT 1
#define PRODUCERS_COUNT 1
#define BUFFSIZE 10

int g_buffer[BUFFSIZE];

unsigned short in = 0;
unsigned short out = 0;
unsigned short produce_id = 0;
unsigned short consume_id = 0;

sem_t g_sem_full;
sem_t g_sem_empty;
pthread_mutex_t g_mutex;

pthread_t g_thread[CONSUMERS_COUNT+PRODUCERS_COUNT];

void* consume(void *arg)
{
	int i;
	int num = (int)arg;
	while (1)
	{
		printf("%d wait buffer not empty\n", num);
		sem_wait(&g_sem_empty);
		pthread_mutex_lock(&g_mutex);

		for (i=0; i