138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "buffer.h"
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#include "chunk.h"
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#include "poison.h"
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#include <glib.h>
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#include <assert.h>
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struct music_buffer {
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struct music_chunk *chunks;
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unsigned num_chunks;
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struct music_chunk *available;
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/** a mutex which protects #available */
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GMutex *mutex;
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#ifndef NDEBUG
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unsigned num_allocated;
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#endif
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};
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struct music_buffer *
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music_buffer_new(unsigned num_chunks)
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{
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struct music_buffer *buffer;
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struct music_chunk *chunk;
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assert(num_chunks > 0);
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buffer = g_new(struct music_buffer, 1);
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buffer->chunks = g_new(struct music_chunk, num_chunks);
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buffer->num_chunks = num_chunks;
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chunk = buffer->available = buffer->chunks;
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poison_undefined(chunk, sizeof(*chunk));
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for (unsigned i = 1; i < num_chunks; ++i) {
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chunk->next = &buffer->chunks[i];
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chunk = chunk->next;
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poison_undefined(chunk, sizeof(*chunk));
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}
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chunk->next = NULL;
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buffer->mutex = g_mutex_new();
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#ifndef NDEBUG
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buffer->num_allocated = 0;
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#endif
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return buffer;
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}
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void
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music_buffer_free(struct music_buffer *buffer)
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{
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assert(buffer->chunks != NULL);
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assert(buffer->num_chunks > 0);
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assert(buffer->num_allocated == 0);
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g_mutex_free(buffer->mutex);
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g_free(buffer->chunks);
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g_free(buffer);
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}
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unsigned
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music_buffer_size(const struct music_buffer *buffer)
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{
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return buffer->num_chunks;
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}
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struct music_chunk *
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music_buffer_allocate(struct music_buffer *buffer)
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{
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struct music_chunk *chunk;
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g_mutex_lock(buffer->mutex);
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chunk = buffer->available;
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if (chunk != NULL) {
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buffer->available = chunk->next;
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music_chunk_init(chunk);
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#ifndef NDEBUG
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++buffer->num_allocated;
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#endif
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}
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g_mutex_unlock(buffer->mutex);
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return chunk;
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}
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void
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music_buffer_return(struct music_buffer *buffer, struct music_chunk *chunk)
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{
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assert(buffer != NULL);
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assert(chunk != NULL);
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if (chunk->other != NULL)
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music_buffer_return(buffer, chunk->other);
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g_mutex_lock(buffer->mutex);
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music_chunk_free(chunk);
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poison_undefined(chunk, sizeof(*chunk));
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chunk->next = buffer->available;
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buffer->available = chunk;
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#ifndef NDEBUG
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--buffer->num_allocated;
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#endif
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g_mutex_unlock(buffer->mutex);
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}
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