X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/6a0129ea8c11c4fd12a6198dac1a3c4ab8af4ecc..34f655c10412ca059d43c78d1e137ab577acdd17:/arena.h

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+/* -*-c-*-
+ *
+ * $Id: arena.h,v 1.1 2000/06/17 10:37:53 mdw Exp $
+ *
+ * Abstraction for memory allocation arenas
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib 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.
+ * 
+ * mLib 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 mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: arena.h,v $
+ * Revision 1.1  2000/06/17 10:37:53  mdw
+ * Basic arena management.
+ *
+ */
+
+#ifndef MLIB_ARENA_H
+#define MLIB_ARENA_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdlib.h>
+
+/*----- Data structures ---------------------------------------------------*/
+
+/* --- An arena structure --- */
+
+typedef struct arena {
+  struct arena_ops *ops;
+} arena;
+      
+typedef struct arena_ops {
+  void *(*alloc)(arena */*a*/, size_t /*sz*/);
+  void *(*realloc)(arena */*a*/, void */*p*/, size_t /*sz*/);
+  void (*free)(arena */*a*/, void */*p*/);
+  void (*purge)(arena */*a*/);
+} arena_ops;
+
+/*----- Global variables --------------------------------------------------*/
+
+extern arena *arena_global;		/* Standard global arena */
+extern arena arena_stdlib;		/* Arena based on @malloc@/@free@ */
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @arena_fakerealloc@ --- *
+ *
+ * Arguments:	@arena *a@ = pointer to arena block
+ *		@void *p@ = pointer to memory block to resize
+ *		@size_t sz@ = size desired for the block
+ *
+ * Returns:	---
+ *
+ * Use:		Standard fake @realloc@ function, for use if you don't
+ *		support @realloc@ properly.
+ */
+
+extern void *arena_fakerealloc(arena */*a*/, void */*p*/, size_t /*sz*/);
+
+/* --- Useful macros --- */
+
+#define A_ALLOC(a, sz) (((a)->ops->alloc)((a), (sz)))
+#define A_REALLOC(a, p, sz) (((a)->ops->realloc)((a), (p), (sz)))
+#define A_FREE(a, p) (((a)->ops->free)((a), (p)))
+
+/* --- Simple function equivalents --- */
+
+extern void *a_alloc(arena */*a*/, size_t /*sz*/);
+extern void *a_realloc(arena */*a*/, void */*p*/, size_t /*sz*/);
+extern void a_free(arena */*a*/, void */*p*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif