haiku/headers/private/media/SharedBufferList.h

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/***********************************************************************
* Copyright (c) 2002 Marcus Overhagen. All Rights Reserved.
* This file may be used under the terms of the OpenBeOS License.
*
* Used for BBufferGroup and BBuffer management across teams
***********************************************************************/
#ifndef _SHARED_BUFFER_LIST_H_
#define _SHARED_BUFFER_LIST_H_
#include <Buffer.h>
// created in the media server, cloned into
// each BBufferGroup (visible in all address spaces / teams)
struct _shared_buffer_list
{
struct _shared_buffer_info
{
media_buffer_id id;
BBuffer * buffer;
bool reclaimed;
// the reclaim_sem belonging to the BBufferGroup of this BBuffer
// also used as a unique identifier of the group
sem_id reclaim_sem;
};
enum { MAX_BUFFER = 666 }; // this fixed limit is probably very evil
sem_id locker_sem;
int32 locker_atom;
// always only the first "buffercount" entries in the "info" array are used
int32 buffercount;
_shared_buffer_info info[MAX_BUFFER];
status_t AddBuffer(sem_id group_reclaim_sem, BBuffer *buffer);
status_t RequestBuffer(sem_id group_reclaim_sem, int32 buffers_in_group, size_t size, media_buffer_id wantID, BBuffer **buffer, bigtime_t timeout);
status_t GetBufferList(sem_id group_reclaim_sem, int32 buf_count, BBuffer **out_buffers);
status_t RecycleBuffer(BBuffer *buffer);
status_t Init();
static _shared_buffer_list *Clone(area_id id = -1);
void Terminate(sem_id group_reclaim_sem);
void Unmap();
status_t Lock();
status_t Unlock();
// used by RequestBuffer, call this one with the list locked!
void RequestBufferInOtherGroups(sem_id group_reclaim_sem, media_buffer_id id);
};
#endif