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ae626d4e BVA |
1 | #include <stdio.h> |
2 | #include <string.h> | |
3 | #include <sys/mman.h> | |
4 | #include <assert.h> | |
5 | ||
6 | #include "log.h" | |
7 | #include "rwlock.h" | |
8 | #include "os/os.h" | |
9 | ||
10 | void fio_rwlock_write(struct fio_rwlock *lock) | |
11 | { | |
12 | assert(lock->magic == FIO_RWLOCK_MAGIC); | |
13 | pthread_rwlock_wrlock(&lock->lock); | |
14 | } | |
15 | ||
16 | void fio_rwlock_read(struct fio_rwlock *lock) | |
17 | { | |
18 | assert(lock->magic == FIO_RWLOCK_MAGIC); | |
19 | pthread_rwlock_rdlock(&lock->lock); | |
20 | } | |
21 | ||
22 | void fio_rwlock_unlock(struct fio_rwlock *lock) | |
23 | { | |
24 | assert(lock->magic == FIO_RWLOCK_MAGIC); | |
25 | pthread_rwlock_unlock(&lock->lock); | |
26 | } | |
27 | ||
28 | void fio_rwlock_remove(struct fio_rwlock *lock) | |
29 | { | |
30 | assert(lock->magic == FIO_RWLOCK_MAGIC); | |
0ffccc21 | 31 | pthread_rwlock_destroy(&lock->lock); |
ae626d4e BVA |
32 | munmap((void *) lock, sizeof(*lock)); |
33 | } | |
34 | ||
35 | struct fio_rwlock *fio_rwlock_init(void) | |
36 | { | |
37 | struct fio_rwlock *lock; | |
38 | pthread_rwlockattr_t attr; | |
39 | int ret; | |
40 | ||
41 | lock = (void *) mmap(NULL, sizeof(struct fio_rwlock), | |
42 | PROT_READ | PROT_WRITE, | |
43 | OS_MAP_ANON | MAP_SHARED, -1, 0); | |
44 | if (lock == MAP_FAILED) { | |
45 | perror("mmap rwlock"); | |
46 | lock = NULL; | |
47 | goto err; | |
48 | } | |
49 | ||
50 | lock->magic = FIO_RWLOCK_MAGIC; | |
51 | ||
52 | ret = pthread_rwlockattr_init(&attr); | |
53 | if (ret) { | |
54 | log_err("pthread_rwlockattr_init: %s\n", strerror(ret)); | |
55 | goto err; | |
56 | } | |
57 | #ifdef CONFIG_PSHARED | |
58 | ret = pthread_rwlockattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); | |
59 | if (ret) { | |
60 | log_err("pthread_rwlockattr_setpshared: %s\n", strerror(ret)); | |
61 | goto destroy_attr; | |
62 | } | |
63 | ||
64 | ret = pthread_rwlock_init(&lock->lock, &attr); | |
65 | #else | |
66 | ret = pthread_rwlock_init(&lock->lock, NULL); | |
67 | #endif | |
68 | ||
69 | if (ret) { | |
70 | log_err("pthread_rwlock_init: %s\n", strerror(ret)); | |
71 | goto destroy_attr; | |
72 | } | |
73 | ||
74 | pthread_rwlockattr_destroy(&attr); | |
75 | ||
76 | return lock; | |
77 | destroy_attr: | |
78 | pthread_rwlockattr_destroy(&attr); | |
79 | err: | |
80 | if (lock) | |
81 | fio_rwlock_remove(lock); | |
82 | return NULL; | |
83 | } |