omsbuff_getslot.c

linuxUNIX下跑的一套服务端程序

/* * 
 *  $Id: OMSbuff_getslot.c 114 2005-03-22 17:41:59Z shawill $
 *  
 *  This file is part of Fenice
 *
 *  Fenice -- Open Media Server
 *
 *  Copyright (C) 2004 by
 *  	
 *	- Giampaolo Mancini	<[e-mail]>
 *	- Francesco Varano	<[e-mail]>
 *	- Marco Penno		<[e-mail]>
 *	- Federico Ridolfo	<[e-mail]>
 *	- Eugenio Menegatti 	<[e-mail]>
 *	- Stefano Cau
 *	- Giuliano Emma
 *	- Stefano Oldrini
 * 
 *  Fenice 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.
 *
 *  Fenice 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 Fenice; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *  
 * */
#include <fenice/bufferpool.h>


/*! \brief get a new empty slot from bufferpool.
 *
 * It do NOT mark the slot as busy, this action will be performed by
 * OMSbuff_write that MUST be called at the end of operations with the obtained
 * slot.
 *
 * \return empty slot.
 */
OMSSlot *OMSbuff_getslot(OMSBuffer *buffer)
{
	OMSSlot *slot=buffer->write_pos; 
	// uint64 curr_seq = slot->slot_seq;

	if(slot->next->refs > 0) {
		// printf("must add slot\n");
		if ( !(slot=OMSbuff_slotadd(buffer,slot)) )
			return NULL;
	} else
		slot=slot->next;

	// slot->refs = buffer->refs;
	// slot->slot_seq = curr_seq + 1;

	// buffer->write_pos=slot;	

	return slot; 
}