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IO--多线程（条件变量）

news 2024/10/28 19:38:50

题目：

实现主线程每隔一秒随机生产3个苹果或两个橘子；

线程一消费5个苹果；

线程二消费7个橘子；

提示：

int rand(void);

功能：获得随机数。

返回值：一个随机数；

代码实现：

#include <myhead.h>
int Orange=0;
int Apple=0;pthread_cond_t condition_apple;
pthread_cond_t condition_orange;pthread_mutex_t mutex;void* eat_5_apple_task(void* arg){while(1){pthread_mutex_lock(&mutex);pthread_cond_wait(&condition_apple,&mutex);Apple-=5;printf("1号消费5个苹果,剩余苹果数：%d\n",Apple);pthread_mutex_unlock(&mutex);}
};void* eat_7_orange_task(void* arg){while(1){pthread_mutex_lock(&mutex);pthread_cond_wait(&condition_orange,&mutex);Orange-=7;printf("1号消费7个橘子,剩余橘子数：%d\n",Orange);pthread_mutex_unlock(&mutex);}
};
int main(int argc, const char *argv[])
{pthread_mutex_init(&mutex,NULL);pthread_cond_init(&condition_apple,NULL);pthread_cond_init(&condition_orange,NULL);pthread_t eat_5_apple_task_id;pthread_t eat_7_orange_task_id;pthread_create(&eat_5_apple_task_id,NULL,eat_5_apple_task,NULL);pthread_create(&eat_7_orange_task_id,NULL,eat_7_orange_task,NULL);while(1){int num=rand();pthread_mutex_lock(&mutex);if(num%2==0){Apple+=2;}else{Orange+=3;}printf("Apple:%d,\tOrange:%d\n",Apple,Orange);if(Apple>5){pthread_cond_signal(&condition_apple);}if(Orange>7){pthread_cond_signal(&condition_orange);}pthread_mutex_unlock(&mutex);sleep(1);}return 0;
}