IO线程进程 day6

1.

#include  
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond1 = PTHREAD_COND_INITIALIZER;
//pthread_cond_t cond2 = PTHREAD_COND_INITIALIZER;
char buf[20]="";
int flag=0;
void *fun_a(void *arg)
{
	ssize_t res;
	while(1)
	{
		pthread_mutex_lock(&mutex);
		if(flag!=0)
			pthread_cond_wait(&cond1,&mutex);
		res=read(*((int *)arg),buf,sizeof(buf));
		if(res==0)
			break;
		flag=1;
		pthread_cond_signal(&cond1);
		pthread_mutex_unlock(&mutex);
	}
	pthread_exit(NULL);
}
void *fun_b(void *arg)
{
	while(1)
	{
		pthread_mutex_lock(&mutex);
		if(flag!=1)
			pthread_cond_wait(&cond1,&mutex);
		write(1,buf,sizeof(buf));
		pthread_cond_signal(&cond1);
		pthread_mutex_unlock(&mutex);
	}
	pthread_exit(NULL);
}
int main(int argc, const char *argv[])
{
	pthread_t tid1,tid2;
	int fd=open("./02_fprintf.c",O_RDONLY);
	pthread_create(&tid1,NULL,fun_a,(void*)&fd);
	pthread_create(&tid2,NULL,fun_b,(void*)&fd);
	pthread_join(tid1,NULL);
	pthread_join(tid2,NULL);
	close(fd);
	pthread_mutex_destroy(&mutex);
	pthread_cond_destroy(&cond1);
//	pthread_cond_destroy(&cond2);
	return 0;
}

2.

#include  
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond1 = PTHREAD_COND_INITIALIZER;
pthread_cond_t cond2 = PTHREAD_COND_INITIALIZER;
pthread_cond_t cond3 = PTHREAD_COND_INITIALIZER;
int flag=0;
void *fun_a(void *arg)
{
	while(1)
	{
		pthread_mutex_lock(&mutex);
		if(flag!=0)
		pthread_cond_wait(&cond1,&mutex);
		printf("%c",*(char*)arg);
		flag=1;
		pthread_cond_signal(&cond2);
		pthread_mutex_unlock(&mutex);
	}
	pthread_exit(NULL);
}
void *fun_b(void *arg)
{
	while(1)
	{
		pthread_mutex_lock(&mutex);
		if(flag!=1)
		pthread_cond_wait(&cond2,&mutex);
		printf("%c",*(char*)arg);
		flag=2;
		pthread_cond_signal(&cond3);
		pthread_mutex_unlock(&mutex);
	}
	pthread_exit(NULL);
}
void *fun_c(void *arg)
{
	while(1)
	{
		pthread_mutex_lock(&mutex);
		if(flag!=2)
			pthread_cond_wait(&cond3,&mutex);
		printf("%c\n",*(char*)arg);
		flag=0;
		sleep(1);
		pthread_cond_signal(&cond1);
		pthread_mutex_unlock(&mutex);
	}

	pthread_exit(NULL);
}
int main(int argc, const char *argv[])
{
	pthread_t tid1,tid2,tid3;
	char a='A';
	char b='B';
	char c='C';
	pthread_create(&tid1,NULL,fun_a,(void*)&a);
	pthread_create(&tid2,NULL,fun_b,(void*)&b);
	pthread_create(&tid3,NULL,fun_c,(void*)&c);
	pthread_join(tid1,NULL);
	pthread_join(tid2,NULL);
	pthread_join(tid3,NULL);
	pthread_mutex_destroy(&mutex);
	pthread_cond_destroy(&cond1);
	pthread_cond_destroy(&cond2);
	pthread_cond_destroy(&cond3);
	return 0;
}

3.

#include
char buf[]="1234567";
sem_t sem1,sem2;
void *fun_a(void *arg)
{
	while(1)
	{
		sem_wait(&sem2);
		printf("%s\n",buf);
		//sleep(1);
		sem_post(&sem1);
		sleep(1);
	}
	pthread_exit(NULL);
}
void *fun_b(void *arg)
{
	sem_t *sem=(sem_t*)arg;
	char tmp=0;
	while(1)
	{
		sem_wait(&sem1);
		for(int i=0;i