| 1 | #include <stdio.h> |
| 2 | #include <pthread.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <string.h> |
| 5 | #include <sys/types.h> |
| 6 | #include <sys/wait.h> |
| 7 | #include <unistd.h> |
| 8 | #include <stdio.h> |
| 9 | #include <assert.h> |
| 10 | #include "urcu.h" |
| 11 | |
| 12 | struct test_array { |
| 13 | int a; |
| 14 | int b; |
| 15 | char c[200]; |
| 16 | }; |
| 17 | |
| 18 | static struct test_array *test_rcu_pointer; |
| 19 | |
| 20 | #define NR_READ 10 |
| 21 | #define NR_WRITE 9 |
| 22 | |
| 23 | |
| 24 | void *thr_reader(void *arg) |
| 25 | { |
| 26 | int qparity, i, j; |
| 27 | struct test_array *local_ptr; |
| 28 | |
| 29 | printf("thread %s, thread id : %lu, pid %lu\n", |
| 30 | "reader", pthread_self(), getpid()); |
| 31 | sleep(2); |
| 32 | |
| 33 | urcu_register_thread(); |
| 34 | |
| 35 | for (i = 0; i < 1000; i++) { |
| 36 | for (j = 0; j < 100000000; j++) { |
| 37 | qparity = rcu_read_lock(); |
| 38 | local_ptr = rcu_dereference(test_rcu_pointer); |
| 39 | if (local_ptr) { |
| 40 | assert(local_ptr->a == 8); |
| 41 | assert(local_ptr->b == 12); |
| 42 | assert(local_ptr->c[55] == 2); |
| 43 | } |
| 44 | rcu_read_unlock(qparity); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | urcu_unregister_thread(); |
| 49 | |
| 50 | return ((void*)1); |
| 51 | |
| 52 | } |
| 53 | |
| 54 | void *thr_writer(void *arg) |
| 55 | { |
| 56 | int i; |
| 57 | struct test_array *new, *old; |
| 58 | |
| 59 | printf("thread %s, thread id : %lu, pid %lu\n", |
| 60 | "writer", pthread_self(), getpid()); |
| 61 | sleep(2); |
| 62 | |
| 63 | for (i = 0; i < 100000; i++) { |
| 64 | rcu_write_lock(); |
| 65 | new = malloc(sizeof(struct test_array)); |
| 66 | old = test_rcu_pointer; |
| 67 | if (old) { |
| 68 | assert(old->a == 8); |
| 69 | assert(old->b == 12); |
| 70 | assert(old->c[55] == 2); |
| 71 | } |
| 72 | new->a = 8; |
| 73 | new->b = 12; |
| 74 | new->c[55] = 2; |
| 75 | old = urcu_publish_content(&test_rcu_pointer, new); |
| 76 | rcu_write_unlock(); |
| 77 | /* can be done after unlock */ |
| 78 | if (old) { |
| 79 | old->a = 0; |
| 80 | old->b = 0; |
| 81 | old->c[55] = 0; |
| 82 | } |
| 83 | free(old); |
| 84 | usleep(1); |
| 85 | } |
| 86 | |
| 87 | return ((void*)2); |
| 88 | } |
| 89 | |
| 90 | int main() |
| 91 | { |
| 92 | int err; |
| 93 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; |
| 94 | void *tret; |
| 95 | int i; |
| 96 | |
| 97 | for (i = 0; i < NR_READ; i++) { |
| 98 | err = pthread_create(&tid_reader[i], NULL, thr_reader, NULL); |
| 99 | if (err != 0) |
| 100 | exit(1); |
| 101 | } |
| 102 | for (i = 0; i < NR_WRITE; i++) { |
| 103 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); |
| 104 | if (err != 0) |
| 105 | exit(1); |
| 106 | } |
| 107 | |
| 108 | sleep(10); |
| 109 | |
| 110 | for (i = 0; i < NR_WRITE; i++) { |
| 111 | err = pthread_join(tid_reader[i], &tret); |
| 112 | if (err != 0) |
| 113 | exit(1); |
| 114 | } |
| 115 | for (i = 0; i < NR_WRITE; i++) { |
| 116 | err = pthread_join(tid_writer[i], &tret); |
| 117 | if (err != 0) |
| 118 | exit(1); |
| 119 | } |
| 120 | |
| 121 | return 0; |
| 122 | } |