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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "MusicBuffer.hxx"
#include "MusicChunk.hxx"
#include "thread/Mutex.hxx"
#include "util/SliceBuffer.hxx"
#include "system/FatalError.hxx"
#include <assert.h>
struct music_buffer : public SliceBuffer<music_chunk> {
/** a mutex which protects #available */
Mutex mutex;
music_buffer(unsigned num_chunks)
:SliceBuffer(num_chunks) {
if (IsOOM())
FatalError("Failed to allocate buffer");
}
};
struct music_buffer *
music_buffer_new(unsigned num_chunks)
{
return new music_buffer(num_chunks);
}
void
music_buffer_free(struct music_buffer *buffer)
{
delete buffer;
}
unsigned
music_buffer_size(const struct music_buffer *buffer)
{
return buffer->GetCapacity();
}
struct music_chunk *
music_buffer_allocate(struct music_buffer *buffer)
{
const ScopeLock protect(buffer->mutex);
return buffer->Allocate();
}
void
music_buffer_return(struct music_buffer *buffer, struct music_chunk *chunk)
{
assert(buffer != NULL);
assert(chunk != NULL);
const ScopeLock protect(buffer->mutex);
if (chunk->other != nullptr) {
assert(chunk->other->other == nullptr);
buffer->Free(chunk->other);
}
buffer->Free(chunk);
}
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