<pre name="code" class="cpp">#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>

pthread_mutex_t lock;
pthread_cond_t cond;

int i = 1;


void* salewinds1(void* args)
{
	while(1)
	{
		pthread_mutex_lock(&lock);
		if(i == 10)
		{

			pthread_mutex_unlock(&lock);//退出前解鎖否則會造成別的執行緒死鎖
			pthread_exit(0);			
		}
		while(i % 2 == 0)
		{
			pthread_cond_wait(&cond, &lock);
		}
		printf("%d\n", i);
		i += 1;
		if(i > 10)
		{

			pthread_mutex_unlock(&lock);
			pthread_exit(0);	
		}
		pthread_cond_broadcast(&cond);
	
		pthread_mutex_unlock(&lock);


	}
	return NULL;
}

void* salewinds2(void* args)
{
	while(1)
	{
		pthread_mutex_lock(&lock);
		if(i > 10)
		{

			pthread_mutex_unlock(&lock);
			pthread_exit(0);
		
		}
		while(i % 2 == 1)
		{
			pthread_cond_wait(&cond, &lock);
		}
		printf("%d\n", i);
		i += 1;
		if(i == 10)
		{

			pthread_mutex_unlock(&lock);
			pthread_exit(0);
			
		}
		pthread_cond_broadcast(&cond);
	
		pthread_mutex_unlock(&lock);


	}
	return NULL;
}


int main(int argc,const char* argv[])
{

	pthread_t thd1;
	pthread_t thd2;
	int val1=1;
	int val2=2;
	pthread_mutex_init(&lock, NULL);
	pthread_cond_init(&cond, NULL);  
	pthread_create(&thd1, NULL, salewinds1, NULL);
	pthread_create(&thd2, NULL, salewinds2, NULL);

	pthread_join(thd1, (void**)&val1);

	pthread_join(thd2, (void**)&val2);


	pthread_mutex_destroy(&lock);
	pthread_cond_destroy(&cond);
	return 0;
}