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66c9107f JB |
1 | #include <semaphore.h> |
2 | #include <unistd.h> | |
3 | #include <pthread.h> | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
6 | ||
7 | #define MAX 6 | |
8 | #define BUF_SIZE 3 | |
9 | typedef struct args { | |
10 | sem_t sem_free; | |
11 | sem_t sem_busy; | |
12 | } args_t; | |
13 | static int buf[BUF_SIZE]; | |
14 | void *prod(void *arg); | |
15 | void *cons(void *arg); | |
16 | ||
17 | int main() | |
18 | { | |
19 | pthread_t t1, t2; | |
20 | args_t args; | |
21 | sem_init(&args.sem_free, 0, BUF_SIZE); | |
22 | sem_init(&args.sem_busy, 0, 0); | |
23 | pthread_create(&t1, NULL, prod, &args); | |
24 | pthread_create(&t2, NULL, cons, &args); | |
25 | pthread_join(t1, NULL); | |
26 | pthread_join(t2, NULL); | |
27 | printf("exit\n"); | |
28 | return EXIT_SUCCESS; | |
29 | } | |
30 | ||
31 | void *prod(void *arg) | |
32 | { | |
33 | int ip = 0, nbprod = 0, obj = 1001; | |
34 | args_t *args = (args_t *) arg; | |
35 | while (nbprod < MAX) { | |
36 | sem_wait(&args->sem_free); | |
37 | buf[ip] = obj; | |
38 | sem_post(&args->sem_busy); | |
39 | printf("prod: buf[%d]=%d\n", ip, obj); | |
40 | obj++; | |
41 | nbprod++; | |
42 | ip = (ip + 1) % BUF_SIZE; | |
43 | } | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | void *cons(void *arg) | |
48 | { | |
49 | int ic = 0, nbcons = 0, obj; | |
50 | args_t *args = (args_t *) arg; | |
51 | while (nbcons < MAX) { | |
52 | sleep(1); | |
53 | sem_wait(&args->sem_busy); | |
54 | obj = buf[ic]; | |
55 | sem_post(&args->sem_free); | |
56 | printf("cons: buf[%d]=%d\n", ic, obj); | |
57 | nbcons++; | |
58 | ic = (ic + 1) % BUF_SIZE; | |
59 | } | |
60 | return NULL; | |
61 | } |