1 /* src/threads/native/lock.h - lock implementation
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.h 4866 2006-05-01 21:40:38Z edwin $
39 #include "vm/global.h"
43 /* typedefs *******************************************************************/
45 typedef struct lock_execution_env_t lock_execution_env_t;
46 typedef struct lock_record_t lock_record_t;
47 typedef struct lock_record_pool_header_t lock_record_pool_header_t;
48 typedef struct lock_record_pool_t lock_record_pool_t;
49 typedef struct lock_waiter_t lock_waiter_t;
50 typedef struct lock_hashtable_t lock_hashtable_t;
53 /* lock_execution_env_t ********************************************************
55 Execution environment. Contains the lock record freelist and pools.
57 *******************************************************************************/
59 struct lock_execution_env_t {
60 lock_record_t *firstfree; /* lock record freelist */
61 lock_record_pool_t *lockrecordpools; /* list of per-thread pools */
62 int lockrecordcount; /* # of records for this thread */
66 /* lock_waiter_t ***************************************************************
68 List node for storing a waiting thread.
70 *******************************************************************************/
72 struct lock_waiter_t {
73 struct threadobject *waiter; /* the waiting thread */
74 lock_waiter_t *next; /* next in list */
78 /* lock_record_t ***************************************************************
80 Lock record struct representing an inflated ("fat") lock.
82 *******************************************************************************/
84 struct lock_record_t {
85 java_objectheader *obj; /* object for which this lock is */
86 struct threadobject *owner; /* current owner of this monitor */
87 s4 count; /* recursive lock count */
88 pthread_mutex_t mutex; /* mutex for synchronizing */
89 lock_waiter_t *waiters; /* list of threads waiting */
90 lock_record_t *nextfree; /* next in free list */
91 lock_record_t *hashlink; /* next record in hash chain */
95 /* lock_hashtable_t ************************************************************
97 The global hashtable mapping objects to lock records.
99 *******************************************************************************/
101 struct lock_hashtable_t {
102 pthread_mutex_t mutex; /* mutex for synch. access to the table */
103 u4 size; /* number of slots */
104 u4 entries; /* current number of entries */
105 lock_record_t **ptr; /* the table of slots, uses ext. chain. */
109 /* lock_record_pool_header_t ***************************************************
111 Lock records are allocated in pools. Each pool has on of these headers.
113 *******************************************************************************/
115 struct lock_record_pool_header_t {
116 lock_record_pool_t *next; /* next pool */
117 int size; /* records in this pool */
121 /* lock_record_pool_t **********************************************************
123 Lock records are allocated in such pools.
125 *******************************************************************************/
127 struct lock_record_pool_t {
128 lock_record_pool_header_t header; /* pool header (see above) */
129 lock_record_t lr[1]; /* variable array of records */
132 #if defined(ENABLE_JVMTI)
133 extern pthread_mutex_t lock_global_pool_lock;
134 extern lock_record_pool_t *lock_global_pool;
138 /* functions ******************************************************************/
140 void lock_init(void);
142 void lock_init_execution_env(struct threadobject *thread);
143 void lock_record_free_pools(lock_record_pool_t *pool);
145 void lock_init_object_lock(java_objectheader *);
146 lock_record_t *lock_get_initial_lock_word(void);
148 ptrint lock_pre_compute_thinlock(s4 index);
150 bool lock_monitor_enter(java_objectheader *);
151 bool lock_monitor_exit(java_objectheader *);
153 #define LOCK_monitor_enter (functionptr) lock_monitor_enter
154 #define LOCK_monitor_exit (functionptr) lock_monitor_exit
156 #define LOCK_MONITOR_ENTER(o) lock_monitor_enter((java_objectheader *) (o))
157 #define LOCK_MONITOR_EXIT(o) lock_monitor_exit((java_objectheader *) (o))
159 bool lock_is_held_by_current_thread(java_objectheader *o);
161 void lock_wait_for_object(java_objectheader *o, s8 millis, s4 nanos);
162 void lock_notify_object(java_objectheader *o);
163 void lock_notify_all_object(java_objectheader *o);
169 * These are local overrides for various environment variables in Emacs.
170 * Please do not remove this and leave it at the end of the file, where
171 * Emacs will automagically detect them.
172 * ---------------------------------------------------------------------
175 * indent-tabs-mode: t
179 * vim:noexpandtab:sw=4:ts=4: