/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*
 *  bufpool.c++ - $Revision: 1.1.1.1 $
 * 	Derrick Burns - 1991
 */

#include "glimports.h"
#include "myassert.h"
#include "bufpool.h"


/*-----------------------------------------------------------------------------
 * Pool - allocate a new pool of buffers
 *-----------------------------------------------------------------------------
 */
Pool::Pool( int _buffersize, int initpoolsize, char *n )
{
    buffersize= (_buffersize < sizeof(Buffer)) ? sizeof(Buffer)	: _buffersize;
    initsize	= initpoolsize * buffersize;
    nextsize	= initsize;
    name	= n;
    magic	= is_allocated;
    nextblock	= 0;
    curblock	= 0;
    freelist	= 0;
    nextfree	= 0;
}

/*-----------------------------------------------------------------------------
 * ~Pool - free a pool of buffers and the pool itself
 *-----------------------------------------------------------------------------
 */

Pool::~Pool( void )
{
    assert( this && (magic == is_allocated) );

    while( nextblock ) {
	delete[] blocklist[--nextblock];
        blocklist[nextblock] = 0;
    }
    magic = is_free;
}


void Pool::grow( void )
{
    assert( this && (magic == is_allocated) );
    curblock = new char[nextsize];
    blocklist[nextblock++] = curblock;
    nextfree = nextsize;
    nextsize *= 2;
}

/*-----------------------------------------------------------------------------
 * Pool::clear - free buffers associated with pool but keep pool 
 *-----------------------------------------------------------------------------
 */

void 
Pool::clear( void )
{
    assert( this && (magic == is_allocated) );

    while( nextblock ) {
        delete[] blocklist[--nextblock];
	blocklist[nextblock] = 0;
    }
    curblock	= 0;
    freelist	= 0;
    nextfree	= 0;
    if( nextsize > initsize )
        nextsize /= 2;
}
