X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/math/mparena.h

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+/* -*-c-*-
+ *
+ * Allocation and freeing of MP buffers
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_MPARENA_H
+#define CATACOMB_MPARENA_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/arena.h>
+
+#ifndef CATACOMB_MPW_H
+#  include "mpw.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+/* --- @mparena_node@ --- *
+ *
+ * For internal use by the MP arena manager.  The free blocks are held in a
+ * binary tree by size, held in the first digit of each vector.
+ */
+
+typedef struct mparena_node {
+  struct mparena_node *left, *right;
+  mpw *v;
+} mparena_node;
+
+/* --- @mparena@ --- *
+ *
+ * The actual arena.
+ */
+
+typedef struct mparena {
+  mparena_node *root;
+  unsigned n;
+  arena *a;
+} mparena;
+
+/*----- Standard arenas ---------------------------------------------------*/
+
+extern mparena mparena_global;
+#define MPARENA_GLOBAL (&mparena_global)
+
+extern mparena mparena_secure;
+#define MPARENA_SECURE (&mparena_secure)
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @mparena_create@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to arena block
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes an MP arena so that blocks can be allocated from
+ *		it.
+ */
+
+extern void mparena_create(mparena */*a*/);
+
+#define MPARENA_INIT { 0, 0, &arena_stdlib }
+
+/* --- @mparena_setarena@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to MP arena block
+ *		@arena *aa@ = pointer to arena
+ *
+ * Returns:	---
+ *
+ * Use:		Sets the underlying arena for an MP arena.
+ */
+
+extern void mparena_setarena(mparena */*a*/, arena */*aa*/);
+
+/* --- @mparena_destroy@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to arena block
+ *
+ * Returns:	---
+ *
+ * Use:		Frees an MP arena, and all the vectors held within it.  The
+ *		blocks which are currently allocated can be freed into some
+ *		other MP arena, as long as the underlying arenas are the
+ *		same.
+ */
+
+extern void mparena_destroy(mparena */*a*/);
+
+/* --- @mparena_count@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to arena block
+ *
+ * Returns:	Number of allocated blocks from this arena.
+ *
+ * Use:		Reports the number of blocks allocated from the arena and not
+ *		yet freed.
+ */
+
+extern unsigned mparena_count(mparena */*a*/);
+
+/* --- @mpalloc@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to arena block
+ *		@size_t sz@ = number of digits required
+ *
+ * Returns:	Pointer to a suitably sized block.
+ *
+ * Use:		Allocates a lump of data suitable for use as an array of MP
+ *		digits.
+ */
+
+extern mpw *mpalloc(mparena */*a*/, size_t /*sz*/);
+
+/* --- @mpfree@ --- *
+ *
+ * Arguments:	@mparena *a@ = pointer to arena block
+ *		@mpw *v@ = pointer to allocated vector
+ *
+ * Returns:	---
+ *
+ * Use:		Returns an MP vector to an arena.
+ */
+
+extern void mpfree(mparena */*a*/, mpw */*v*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif