| 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); |
| 31 | pthread_rwlock_destroy(&lock->lock); |
| 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 | } |