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 $
36 #include "threads/critical.h"
38 #include "toolbox/avl.h"
40 #include "vm/jit/asmpart.h"
43 /* the AVL tree containing the critical sections */
45 static avl_tree_t *criticaltree;
48 /* prototypes *****************************************************************/
50 static s4 critical_comparator(const void *treenode, const void *node);
51 static void critical_register_asm_critical_sections(void);
54 /* critical_init ***************************************************************
56 Init global data structures.
58 *******************************************************************************/
60 void critical_init(void)
62 criticaltree = avl_create(&critical_comparator);
64 critical_register_asm_critical_sections();
68 /* critical_comparator *********************************************************
70 Comparison function for AVL tree of critical section.
73 treenode....node in the tree
74 node........node to compare with tree-node
77 -1, 0, +1 for (pa <, ==, > pb)
79 *******************************************************************************/
81 static s4 critical_comparator(const void *treenode, const void *node)
83 const critical_section_node_t *treecsn;
84 const critical_section_node_t *csn;
90 # define ADDR_MASK(x) ((u1 *)((s4)(x) & 0x7FFFFFFF))
92 # define ADDR_MASK(x) (x)
95 /* compare for avl_find if we have found an entry */
98 (ADDR_MASK(treecsn->start) <= ADDR_MASK(csn->start)) &&
99 (ADDR_MASK(csn->start) < ADDR_MASK(treecsn->end))
103 /* these are for walking the tree */
105 if (ADDR_MASK(treecsn->start) < ADDR_MASK(csn->start))
114 /* critical_section_register ***************************************************
116 Register a critical section.
119 csn....node for the critical section
121 *******************************************************************************/
123 void critical_section_register(critical_section_node_t *csn)
125 (void) avl_insert(criticaltree, csn);
129 /* critical_find_restart_point *************************************************
131 Find a restart point for the given PC, in case it is in a critical
138 PC of the restart point, or
139 NULL if the given mcodeptr is not in a critical section
141 *******************************************************************************/
143 u1 *critical_find_restart_point(u1 *pc)
145 critical_section_node_t csnpc;
146 const critical_section_node_t *csn;
148 /* fill the temporary node for comparison */
152 /* see if there's an entry for that PC */
154 csn = avl_find(criticaltree, &csnpc);
163 /* critical_register_asm_critical_sections *************************************
165 Register critical sections defined in the array asm_criticalsections.
167 *******************************************************************************/
169 static void critical_register_asm_critical_sections(void)
171 /* XXX TWISTI: this is just a quick hack */
172 #if defined(ENABLE_JIT) && defined(ENABLE_THREADS)
173 critical_section_node_t *n = &asm_criticalsections;
176 critical_section_register(n++);
182 * These are local overrides for various environment variables in Emacs.
183 * Please do not remove this and leave it at the end of the file, where
184 * Emacs will automagically detect them.
185 * ---------------------------------------------------------------------
188 * indent-tabs-mode: t
192 * vim:noexpandtab:sw=4:ts=4: