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authormarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
committermarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
commita0c4815433ccd57322f4f7703ca35e9ccfa59250 (patch)
treef5213802ec12adb86ec3136001c1c29fe5343700 /mesalib/src/glu/sgi/libnurbs/internals/bufpool.h
parentc73dc01b6de45612b24dc2dd34fba24d81ebf46c (diff)
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Added MesaLib-7.6
Diffstat (limited to 'mesalib/src/glu/sgi/libnurbs/internals/bufpool.h')
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diff --git a/mesalib/src/glu/sgi/libnurbs/internals/bufpool.h b/mesalib/src/glu/sgi/libnurbs/internals/bufpool.h
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+/*
+ * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
+ * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice including the dates of first publication and
+ * either this permission notice or a reference to
+ * http://oss.sgi.com/projects/FreeB/
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Silicon Graphics, Inc.
+ * shall not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization from
+ * Silicon Graphics, Inc.
+ */
+
+/*
+ * bufpool.h
+ *
+ */
+
+#ifndef __glubufpool_h_
+#define __glubufpool_h_
+
+#include "gluos.h"
+#include "myassert.h"
+#include "mystdlib.h"
+
+#define NBLOCKS 32
+
+class Buffer {
+ friend class Pool;
+ Buffer * next; /* next buffer on free list */
+};
+
+class Pool {
+public:
+ Pool( int, int, const char * );
+ ~Pool( void );
+ inline void* new_buffer( void );
+ inline void free_buffer( void * );
+ void clear( void );
+
+private:
+ void grow( void );
+
+protected:
+ Buffer *freelist; /* linked list of free buffers */
+ char *blocklist[NBLOCKS]; /* blocks of malloced memory */
+ int nextblock; /* next free block index */
+ char *curblock; /* last malloced block */
+ int buffersize; /* bytes per buffer */
+ int nextsize; /* size of next block of memory */
+ int nextfree; /* byte offset past next free buffer */
+ int initsize;
+ enum Magic { is_allocated = 0xf3a1, is_free = 0xf1a2 };
+ const char *name; /* name of the pool */
+ Magic magic; /* marker for valid pool */
+};
+
+/*-----------------------------------------------------------------------------
+ * Pool::free_buffer - return a buffer to a pool
+ *-----------------------------------------------------------------------------
+ */
+
+inline void
+Pool::free_buffer( void *b )
+{
+ assert( (this != 0) && (magic == is_allocated) );
+
+ /* add buffer to singly connected free list */
+
+ ((Buffer *) b)->next = freelist;
+ freelist = (Buffer *) b;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Pool::new_buffer - allocate a buffer from a pool
+ *-----------------------------------------------------------------------------
+ */
+
+inline void *
+Pool::new_buffer( void )
+{
+ void *buffer;
+
+ assert( (this != 0) && (magic == is_allocated) );
+
+ /* find free buffer */
+
+ if( freelist ) {
+ buffer = (void *) freelist;
+ freelist = freelist->next;
+ } else {
+ if( ! nextfree )
+ grow( );
+ nextfree -= buffersize;;
+ buffer = (void *) (curblock + nextfree);
+ }
+ return buffer;
+}
+
+class PooledObj {
+public:
+ inline void * operator new( size_t, Pool & );
+ inline void * operator new( size_t, void *);
+ inline void * operator new( size_t s)
+ { return ::new char[s]; }
+ inline void operator delete( void * ) { assert( 0 ); }
+ inline void operator delete( void *, Pool & ) { assert( 0 ); }
+ inline void deleteMe( Pool & );
+};
+
+inline void *
+PooledObj::operator new( size_t, Pool& pool )
+{
+ return pool.new_buffer();
+}
+
+inline void
+PooledObj::deleteMe( Pool& pool )
+{
+ pool.free_buffer( (void *) this );
+}
+
+#endif /* __glubufpool_h_ */