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87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*****************************************************************************
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# #
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# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
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# #
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# Copyright (C) 2018-2024 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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*****************************************************************************/
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#include <assert.h>
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#include "ring.h"
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#include "types.h"
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#include "tools.h"
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#include "queue.h"
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int _acquire(us_ring_s *ring, us_queue_s *queue, ldf timeout);
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void _release(us_ring_s *ring, us_queue_s *queue, uint index);
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us_ring_s *us_ring_init(uint capacity) {
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us_ring_s *ring;
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US_CALLOC(ring, 1);
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US_CALLOC(ring->items, capacity);
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US_CALLOC(ring->places, capacity);
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ring->capacity = capacity;
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ring->producer = us_queue_init(capacity);
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ring->consumer = us_queue_init(capacity);
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for (uint index = 0; index < capacity; ++index) {
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ring->places[index] = index; // XXX: Just to avoid casting between pointer and uint
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assert(!us_queue_put(ring->producer, (void*)(ring->places + index), 0));
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}
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return ring;
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}
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void us_ring_destroy(us_ring_s *ring) {
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us_queue_destroy(ring->consumer);
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us_queue_destroy(ring->producer);
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free(ring->places);
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free(ring->items);
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free(ring);
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}
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int us_ring_producer_acquire(us_ring_s *ring, ldf timeout) {
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return _acquire(ring, ring->producer, timeout);
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}
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void us_ring_producer_release(us_ring_s *ring, uint index) {
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_release(ring, ring->consumer, index);
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}
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int us_ring_consumer_acquire(us_ring_s *ring, ldf timeout) {
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return _acquire(ring, ring->consumer, timeout);
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}
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void us_ring_consumer_release(us_ring_s *ring, uint index) {
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_release(ring, ring->producer, index);
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}
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int _acquire(us_ring_s *ring, us_queue_s *queue, ldf timeout) {
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(void)ring;
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uint *place;
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if (us_queue_get(queue, (void**)&place, timeout) < 0) {
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return -1;
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}
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return *place;
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}
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void _release(us_ring_s *ring, us_queue_s *queue, uint index) {
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assert(!us_queue_put(queue, (void*)(ring->places + index), 0));
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}
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