1 /* src/threads/critical.c - restartable critical sections
3 Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 $Id: threads.c 4903 2006-05-11 12:48:43Z edwin $
37 #include "threads/critical.h"
39 #include "toolbox/avl.h"
42 /* the AVL tree containing the critical sections */
44 static avl_tree_t *criticaltree;
47 /* prototypes *****************************************************************/
49 static int critical_comparator(const void *treenode, const void *node);
52 /* critical_init ***************************************************************
54 Init global data structures.
56 *******************************************************************************/
58 void critical_init(void)
60 criticaltree = avl_create(&critical_comparator);
64 /* critical_comparator *********************************************************
66 Comparison function for AVL tree of critical section.
69 treenode....node in the tree
70 node........node to compare with tree-node
73 -1, 0, +1 for (pa <, ==, > pb)
75 *******************************************************************************/
77 static int critical_comparator(const void *treenode, const void *node)
79 const critical_section_node_t *treecsn;
80 const critical_section_node_t *csn;
86 # define ADDR_MASK(x) ((u1 *)((s4)(x) & 0x7FFFFFFF))
88 # define ADDR_MASK(x) (x)
91 /* compare for avl_find if we have found an entry */
94 (ADDR_MASK(treecsn->start) <= ADDR_MASK(csn->start)) &&
95 (ADDR_MASK(csn->start) < ADDR_MASK(treecsn->end))
99 /* these are for walking the tree */
101 if (ADDR_MASK(treecsn->start) < ADDR_MASK(csn->start))
110 /* critical_section_register ***************************************************
112 Register a critical section.
115 csn....node for the critical section
117 *******************************************************************************/
119 void critical_section_register(critical_section_node_t *csn)
121 (void) avl_insert(criticaltree, csn);
125 /* critical_find_restart_point *************************************************
127 Find a restart point for the given PC, in case it is in a critical
134 PC of the restart point, or
135 NULL if the given mcodeptr is not in a critical section
137 *******************************************************************************/
139 u1 *critical_find_restart_point(u1 *pc)
141 critical_section_node_t csnpc;
142 const critical_section_node_t *csn;
144 /* fill the temporary node for comparison */
148 /* see if there's an entry for that PC */
150 csn = avl_find(criticaltree, &csnpc);
160 * These are local overrides for various environment variables in Emacs.
161 * Please do not remove this and leave it at the end of the file, where
162 * Emacs will automagically detect them.
163 * ---------------------------------------------------------------------
166 * indent-tabs-mode: t
170 * vim:noexpandtab:sw=4:ts=4: