1 #include<stdio.h>
2 #include<stdlib.h>
3 #include<semaphore.h>
4 #include<pthread.h>
5 #include<unistd.h>
6
7 #define NumOf_Producer 5 //the max num of producer
8 #define NumOf_Consumer 10 //the max num of consumer
9 #define Maxnum 10 // the max num of product
10 sem_t Empty_sem; //the goal of whether the num of product is null
11 sem_t Full_sem; //the goal of whether the num of product is equal to Maxnum
12
13 pthread_mutex_t Mutex; //the goal of whether someone use the buff
14
15 int Producer_id = 0;
16 int Consumer_id = 0;
17 int NowNumOfProduce = 0;
18 void *Producer(void *arg) //the thread of producer
19 {
20 int id = Producer_id++;
21 while(1)
22 {
23 sleep(0.1);
24 sem_wait(&Full_sem); //when it comes to zero ,it means that the num of product is equal to Maxnum
25 pthread_mutex_lock(&Mutex); //lock the buff
26 NowNumOfProduce++;
27 printf("Producerthread %d product one,the num is:%d \n",id%NumOf_Producer,NowNumOfProduce);
28 pthread_mutex_unlock(&Mutex);
29 sem_post(&Empty_sem); //when it comes to ten ,it means there are ten products can be used by consumer
30 }
31
32 return ((void *)0);
33 }
34
35 void *Consumer(void *arg)
36 {
37 int id = Consumer_id++;
38 while(1)
39 {
40 sleep(0.2);
41 sem_wait(&Empty_sem);
42 pthread_mutex_lock(&Mutex);
43 NowNumOfProduce--;
44 printf("Consumerthread %d use product one,the num is:%d \n",id%NumOf_Consumer,NowNumOfProduce);
45 pthread_mutex_unlock(&Mutex);
46 sem_post(&Full_sem);
47 }
48 return ((void *)0);
49 }
50
51 int main()
52 {
53 pthread_t Con[NumOf_Consumer];
54 pthread_t Pro[NumOf_Producer];
55
56 int temp1 = sem_init(&Empty_sem,0,0);
57 int temp2 = sem_init(&Full_sem,0,Maxnum);
58 if(temp1&&temp2!=0)
59 {
60 printf("sem init failed \n");
61 exit(1);
62 }
63
64 int temp3 = pthread_mutex_init(&Mutex,NULL);
65
66 if(temp3!=0)
67 {
68 printf("Mutex init failed \n");
69 exit(1);
70 }
71
72 for(int i=0 ;i<NumOf_Producer;i++)
73 {
74 int temp4 = pthread_create(&Pro[i],NULL,Producer,(void *)&i);
75 if(temp4!=0)
76 {
77 printf("thread create failed !\n");
78 exit(1);
79 }
80 }
81
82 for(int i=0;i<NumOf_Consumer;i++)
83 {
84 int temp5 = pthread_create(&Con[i],NULL,Consumer,(void *)&i);
85 if(temp5!=0)
86 {
87 printf("thread create failed !\n");
88 }
89 exit(1);
90 }
91 //destroy the thread
92 for(int i=0;i<NumOf_Consumer;i++)
93 {
94 pthread_join(Con[i],NULL);
95 }
96
97 for(int i=0;i<NumOf_Producer;i++)
98 {
99 pthread_join(Pro[i],NULL);
100 }
101
102 return 0;
103 }
说明：unisted.h是用来调用sleep，pthread.h是linux系统下线程编程的库，semaphore.h是使用信号灯的函数库，至于那些初始化方法，wait方法，post等可以去查查的。如果在编译程序时候出现类似sem_t未定义等问题，需要设置一下link链接，找到linux系统下安装的lib库中的libpthread.so导入进去就好了。
