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
35 #include "threads/critical.h"
37 #include "toolbox/avl.h"
40 /* the AVL tree containing the critical sections */
42 static avl_tree_t *criticaltree;
45 /* prototypes *****************************************************************/
47 static int critical_comparator(const void *treenode, const void *node);
50 /* critical_init ***************************************************************
52 Init global data structures.
54 *******************************************************************************/
56 void critical_init(void)
58 criticaltree = avl_create(&critical_comparator);
62 /* critical_comparator *********************************************************
64 Comparison function for AVL tree of critical section.
67 treenode....node in the tree
68 node........node to compare with tree-node
71 -1, 0, +1 for (pa <, ==, > pb)
73 *******************************************************************************/
75 static int critical_comparator(const void *treenode, const void *node)
77 const critical_section_node_t *treecsn;
78 const critical_section_node_t *csn;
84 # define ADDR_MASK(x) ((u1 *)((s4)(x) & 0x7FFFFFFF))
86 # define ADDR_MASK(x) (x)
89 /* compare for avl_find if we have found an entry */
92 (ADDR_MASK(treecsn->start) <= ADDR_MASK(csn->start)) &&
93 (ADDR_MASK(csn->start) < ADDR_MASK(treecsn->end))
97 /* these are for walking the tree */
99 if (ADDR_MASK(treecsn->start) < ADDR_MASK(csn->start))
108 /* critical_section_register ***************************************************
110 Register a critical section.
113 csn....node for the critical section
115 *******************************************************************************/
117 void critical_section_register(critical_section_node_t *csn)
119 (void) avl_insert(criticaltree, csn);
123 /* critical_find_restart_point *************************************************
125 Find a restart point for the given PC, in case it is in a critical
132 PC of the restart point, or
133 NULL if the given mcodeptr is not in a critical section
135 *******************************************************************************/
137 u1 *critical_find_restart_point(u1 *pc)
139 critical_section_node_t csnpc;
140 const critical_section_node_t *csn;
142 /* fill the temporary node for comparison */
146 /* see if there's an entry for that PC */
148 csn = avl_find(criticaltree, &csnpc);
158 * These are local overrides for various environment variables in Emacs.
159 * Please do not remove this and leave it at the end of the file, where
160 * Emacs will automagically detect them.
161 * ---------------------------------------------------------------------
164 * indent-tabs-mode: t
168 * vim:noexpandtab:sw=4:ts=4: