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