It is accomplished ...

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
2002-07-09 12:24:59 +00:00
commit 52a3801208
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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_
+
+// 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