1 /* src/threads/native/lock.h - lock implementation
3 Copyright (C) 1996-2005, 2006, 2007, 2008
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
35 #include "native/llni.h"
37 #include "toolbox/list.h"
39 #include "vm/global.h"
43 /* typedefs *******************************************************************/
45 typedef struct lock_record_t lock_record_t;
46 typedef struct lock_waiter_t lock_waiter_t;
47 typedef struct lock_hashtable_t lock_hashtable_t;
50 /* lock_waiter_t ***************************************************************
52 List node for storing a waiting thread.
54 *******************************************************************************/
56 struct lock_waiter_t {
57 struct threadobject *thread; /* the waiting thread */
62 /* lock_record_t ***************************************************************
64 Lock record struct representing an inflated ("fat") lock.
66 *******************************************************************************/
68 struct lock_record_t {
69 java_object_t *object; /* object for which this lock is */
70 struct threadobject *owner; /* current owner of this monitor */
71 s4 count; /* recursive lock count */
72 pthread_mutex_t mutex; /* mutex for synchronizing */
73 list_t *waiters; /* list of threads waiting */
74 lock_record_t *hashlink; /* next record in hash chain */
78 /* lock_hashtable_t ************************************************************
80 The global hashtable mapping objects to lock records.
82 *******************************************************************************/
84 struct lock_hashtable_t {
85 pthread_mutex_t mutex; /* mutex for synch. access to the table */
86 u4 size; /* number of slots */
87 u4 entries; /* current number of entries */
88 lock_record_t **ptr; /* the table of slots, uses ext. chain. */
92 /* defines ********************************************************************/
94 #define LOCK_INIT_OBJECT_LOCK(o) lock_init_object_lock((java_object_t *) (o))
96 #define LOCK_MONITOR_ENTER(o) lock_monitor_enter((java_handle_t *) LLNI_QUICKWRAP(o))
97 #define LOCK_MONITOR_EXIT(o) lock_monitor_exit((java_handle_t *) LLNI_QUICKWRAP(o))
99 #define LOCK_WAIT_FOREVER(o) lock_wait_for_object((java_handle_t *) LLNI_QUICKWRAP(o), 0, 0)
100 #define LOCK_NOTIFY(o) lock_notify_object((java_handle_t *) LLNI_QUICKWRAP(o))
106 * These are local overrides for various environment variables in Emacs.
107 * Please do not remove this and leave it at the end of the file, where
108 * Emacs will automagically detect them.
109 * ---------------------------------------------------------------------
112 * indent-tabs-mode: t
116 * vim:noexpandtab:sw=4:ts=4: