tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ref.c (3114B)

      1 /*
      2 * Copyright © 2018, VideoLAN and dav1d authors
      3 * Copyright © 2018, Two Orioles, LLC
      4 * All rights reserved.
      5 *
      6 * Redistribution and use in source and binary forms, with or without
      7 * modification, are permitted provided that the following conditions are met:
      8 *
      9 * 1. Redistributions of source code must retain the above copyright notice, this
     10 *    list of conditions and the following disclaimer.
     11 *
     12 * 2. Redistributions in binary form must reproduce the above copyright notice,
     13 *    this list of conditions and the following disclaimer in the documentation
     14 *    and/or other materials provided with the distribution.
     15 *
     16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
     17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
     20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26 */
     27 
     28 #include "config.h"
     29 
     30 #include "src/ref.h"
     31 
     32 static void default_free_callback(const uint8_t *const data, void *const user_data) {
     33    assert(data == user_data);
     34    dav1d_free_aligned(user_data);
     35 }
     36 
     37 Dav1dRef *dav1d_ref_create(const enum AllocationType type, size_t size) {
     38    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
     39 
     40    uint8_t *const data = dav1d_alloc_aligned(type, size + sizeof(Dav1dRef), 64);
     41    if (!data) return NULL;
     42 
     43    Dav1dRef *const res = (Dav1dRef*)(data + size);
     44    res->const_data = res->user_data = res->data = data;
     45    atomic_init(&res->ref_cnt, 1);
     46    res->free_ref = 0;
     47    res->free_callback = default_free_callback;
     48 
     49    return res;
     50 }
     51 
     52 static void pool_free_callback(const uint8_t *const data, void *const user_data) {
     53    dav1d_mem_pool_push((Dav1dMemPool*)data, user_data);
     54 }
     55 
     56 Dav1dRef *dav1d_ref_create_using_pool(Dav1dMemPool *const pool, size_t size) {
     57    size = (size + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
     58 
     59    Dav1dMemPoolBuffer *const buf =
     60        dav1d_mem_pool_pop(pool, size + sizeof(Dav1dRef));
     61    if (!buf) return NULL;
     62 
     63    Dav1dRef *const res = &((Dav1dRef*)buf)[-1];
     64    res->data = buf->data;
     65    res->const_data = pool;
     66    atomic_init(&res->ref_cnt, 1);
     67    res->free_ref = 0;
     68    res->free_callback = pool_free_callback;
     69    res->user_data = buf;
     70 
     71    return res;
     72 }
     73 
     74 void dav1d_ref_dec(Dav1dRef **const pref) {
     75    assert(pref != NULL);
     76 
     77    Dav1dRef *const ref = *pref;
     78    if (!ref) return;
     79 
     80    *pref = NULL;
     81    if (atomic_fetch_sub(&ref->ref_cnt, 1) == 1) {
     82        const int free_ref = ref->free_ref;
     83        ref->free_callback(ref->const_data, ref->user_data);
     84        if (free_ref) dav1d_free(ref);
     85    }
     86 }