-/* src/threads/critical.c - restartable critical sections
-
- Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
- C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
- E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
- J. Wenninger, Institut f. Computersprachen - TU Wien
-
- This file is part of CACAO.
-
- This program 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, or (at
- your option) any later version.
-
- This program 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 this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA.
-
-*/
-
-
-#include "config.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include "vm/types.h"
-
-#include "threads/critical.h"
-
-#include "toolbox/avl.h"
-
-
-/* the AVL tree containing the critical sections */
-
-static avl_tree_t *criticaltree;
-
-
-/* prototypes *****************************************************************/
-
-static int critical_comparator(const void *treenode, const void *node);
-
-
-/* critical_init ***************************************************************
-
- Init global data structures.
-
-*******************************************************************************/
-
-void critical_init(void)
-{
- criticaltree = avl_create(&critical_comparator);
-}
-
-
-/* critical_comparator *********************************************************
-
- Comparison function for AVL tree of critical section.
-
- IN:
- treenode....node in the tree
- node........node to compare with tree-node
-
- RETURN VALUE:
- -1, 0, +1 for (pa <, ==, > pb)
-
-*******************************************************************************/
-
-static int critical_comparator(const void *treenode, const void *node)
-{
- const critical_section_node_t *treecsn;
- const critical_section_node_t *csn;
-
- treecsn = treenode;
- csn = node;
-
-#ifdef __S390__
-# define ADDR_MASK(x) ((u1 *)((s4)(x) & 0x7FFFFFFF))
-#else
-# define ADDR_MASK(x) (x)
-#endif
-
- /* compare for avl_find if we have found an entry */
-
- if (
- (ADDR_MASK(treecsn->start) <= ADDR_MASK(csn->start)) &&
- (ADDR_MASK(csn->start) < ADDR_MASK(treecsn->end))
- )
- return 0;
-
- /* these are for walking the tree */
-
- if (ADDR_MASK(treecsn->start) < ADDR_MASK(csn->start))
- return -1;
- else
- return 1;
-
-#undef ADDR_MASK
-}
-
-
-/* critical_section_register ***************************************************
-
- Register a critical section.
-
- IN:
- csn....node for the critical section
-
-*******************************************************************************/
-
-void critical_section_register(critical_section_node_t *csn)
-{
- (void) avl_insert(criticaltree, csn);
-}
-
-
-/* critical_find_restart_point *************************************************
-
- Find a restart point for the given PC, in case it is in a critical
- section.
-
- IN:
- pc.........PC
-
- OUT:
- PC of the restart point, or
- NULL if the given mcodeptr is not in a critical section
-
-*******************************************************************************/
-
-u1 *critical_find_restart_point(u1 *pc)
-{
- critical_section_node_t csnpc;
- const critical_section_node_t *csn;
-
- /* fill the temporary node for comparison */
-
- csnpc.start = pc;
-
- /* see if there's an entry for that PC */
-
- csn = avl_find(criticaltree, &csnpc);
-
- if (csn == NULL)
- return NULL;
-
- return csn->restart;
-}
-
-
-/*
- * These are local overrides for various environment variables in Emacs.
- * Please do not remove this and leave it at the end of the file, where
- * Emacs will automagically detect them.
- * ---------------------------------------------------------------------
- * Local variables:
- * mode: c
- * indent-tabs-mode: t
- * c-basic-offset: 4
- * tab-width: 4
- * End:
- * vim:noexpandtab:sw=4:ts=4:
- */