| 1 | /* |
| 2 | * ref.c: reference counting |
| 3 | * |
| 4 | * Babeltrace Library |
| 5 | * |
| 6 | * Copyright (c) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | * of this software and associated documentation files (the "Software"), to deal |
| 10 | * in the Software without restriction, including without limitation the rights |
| 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | * copies of the Software, and to permit persons to whom the Software is |
| 13 | * furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 24 | * SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #define BT_LOG_TAG "REF" |
| 28 | #include <babeltrace/lib-logging-internal.h> |
| 29 | |
| 30 | #include <babeltrace/ref-internal.h> |
| 31 | #include <babeltrace/object-internal.h> |
| 32 | |
| 33 | void *bt_get(void *ptr) |
| 34 | { |
| 35 | struct bt_object *obj = ptr; |
| 36 | |
| 37 | if (unlikely(!obj)) { |
| 38 | goto end; |
| 39 | } |
| 40 | |
| 41 | if (unlikely(!obj->ref_count.release)) { |
| 42 | goto end; |
| 43 | } |
| 44 | |
| 45 | if (unlikely(obj->parent && bt_object_get_ref_count(obj) == 0)) { |
| 46 | BT_LOGV("Incrementing object's parent's reference count: " |
| 47 | "addr=%p, parent-addr=%p", ptr, obj->parent); |
| 48 | bt_get(obj->parent); |
| 49 | } |
| 50 | BT_LOGV("Incrementing object's reference count: %lu -> %lu: " |
| 51 | "addr=%p, cur-count=%lu, new-count=%lu", |
| 52 | obj->ref_count.count, obj->ref_count.count + 1, |
| 53 | ptr, |
| 54 | obj->ref_count.count, obj->ref_count.count + 1); |
| 55 | bt_ref_get(&obj->ref_count); |
| 56 | |
| 57 | end: |
| 58 | return obj; |
| 59 | } |
| 60 | |
| 61 | void bt_put(void *ptr) |
| 62 | { |
| 63 | struct bt_object *obj = ptr; |
| 64 | |
| 65 | if (unlikely(!obj)) { |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | if (unlikely(!obj->ref_count.release)) { |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | if (BT_LOG_ON_WARN && unlikely(bt_object_get_ref_count(obj) == 0)) { |
| 74 | BT_LOGW("Decrementing a reference count set to 0: addr=%p", |
| 75 | ptr); |
| 76 | } |
| 77 | |
| 78 | BT_LOGV("Decrementing object's reference count: %lu -> %lu: " |
| 79 | "addr=%p, cur-count=%lu, new-count=%lu", |
| 80 | obj->ref_count.count, obj->ref_count.count - 1, |
| 81 | ptr, |
| 82 | obj->ref_count.count, obj->ref_count.count - 1); |
| 83 | bt_ref_put(&obj->ref_count); |
| 84 | } |