ref: 9e08ac7112b6a4fef6e1dde6152ceef1117aa6f4
dir: /src/ref.c/
/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "common/mem.h" #include "src/ref.h" static void default_free_callback(const uint8_t *const data, void *const user_data) { assert(data == user_data); dav1d_free_aligned(user_data); } Dav1dRef *dav1d_ref_create(const size_t size) { Dav1dRef *res; void *data = dav1d_alloc_aligned(size, 32); if (!data) { return NULL; } res = dav1d_ref_wrap(data, default_free_callback, data); if (!res) { free(data); } return res; } Dav1dRef *dav1d_ref_wrap(const uint8_t *const ptr, void (*free_callback)(const uint8_t *data, void *user_data), void *user_data) { Dav1dRef *res = malloc(sizeof(Dav1dRef)); if (!res) return NULL; if (ptr == user_data) res->data = user_data; res->const_data = ptr; atomic_init(&res->ref_cnt, 1); res->free_callback = free_callback; res->user_data = user_data; return res; } void dav1d_ref_inc(Dav1dRef *const ref) { atomic_fetch_add(&ref->ref_cnt, 1); } void dav1d_ref_dec(Dav1dRef **const pref) { assert(pref != NULL); Dav1dRef *const ref = *pref; if (!ref) return; if (atomic_fetch_sub(&ref->ref_cnt, 1) == 1) { ref->free_callback(ref->const_data, ref->user_data); free(ref); } *pref = NULL; } int dav1d_ref_is_writable(Dav1dRef *const ref) { return atomic_load(&ref->ref_cnt) == 1; }