Linux下生產者與消費者的執行緒實現

澤中有火發表於2017-01-09
Linux執行緒

程式碼見《現代作業系統》 第3版。

為了顯示效果，新增了printf()函式來顯示執行效果

 1 #include<stdio.h>
 2 #include<pthread.h>
 3 #define MAX 20
 4 pthread_mutex_t the_mutex;
 5 pthread_cond_t condc, condp;
 6 int buffer = 0;
 7 
 8 void *producer(void *ptr)
 9 {
10     int i;
11     for(i = 1; i <= MAX; i++)
12     {
13         pthread_mutex_lock(&the_mutex);
14         while(buffer != 0) pthread_cond_wait(&condp, &the_mutex);
15         buffer = i;
16         printf("%d ", buffer);
17         pthread_cond_signal(&condc);
18         pthread_mutex_unlock(&the_mutex);
19     }
20     pthread_exit(0);
21 }
22 
23 void *consumer(void *ptr)
24 {
25     int i;
26     for(i = 1; i < MAX; i++)
27     {
28         pthread_mutex_lock(&the_mutex);
29         while(buffer == 0)pthread_cond_wait(&condc, &the_mutex);
30         buffer = 0;
31         printf("%d ", buffer);
32         pthread_cond_signal(&condp);
33         pthread_mutex_unlock(&the_mutex);
34     }
35     pthread_exit(0);
36 }
37 
38 int main(void)
39 {
40     pthread_t pro, con;
41     pthread_mutex_init(&the_mutex, 0);
42     pthread_cond_init(&condc, 0);
43     pthread_cond_init(&condp, 0);
44     pthread_create(&con, 0, consumer, 0);
45     pthread_create(&pro, 0, producer, 0);
46     pthread_join(pro, 0);
47     pthread_join(con, 0);
48     pthread_cond_destroy(&condc);
49     pthread_cond_destroy(&condp);
50     pthread_mutex_destroy(&the_mutex);
51 }

編譯命令

gcc -lpthread -o procro procro.c

執行後的效果如：

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