1 /* src/threads/native/lock.h - lock implementation
3 Copyright (C) 1996-2005, 2006 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 Contact: cacao@cacaojvm.org
29 Changes: Christian Thalinger
32 $Id: threads.h 4866 2006-05-01 21:40:38Z edwin $
44 #include <semaphore.h>
46 #include "vm/global.h"
48 /* typedefs *******************************************************************/
50 typedef struct lock_execution_env_t lock_execution_env_t;
51 typedef struct lock_record_t lock_record_t;
52 typedef struct lock_record_pool_header_t lock_record_pool_header_t;
53 typedef struct lock_record_pool_t lock_record_pool_t;
54 typedef struct lock_waiter_t lock_waiter_t;
57 /* lock_execution_env_t ********************************************************
59 Execution environment. Contains the lock record freelist and pools.
61 *******************************************************************************/
63 struct lock_execution_env_t {
64 lock_record_t *firstfree; /* lock record freelist */
65 lock_record_pool_t *lockrecordpools; /* list of per-thread pools */
66 int lockrecordcount; /* # of records for this thread */
70 /* lock_waiter_t ***************************************************************
72 List node for storing a waiting thread.
74 *******************************************************************************/
76 struct lock_waiter_t {
77 struct threadobject *waiter; /* the waiting thread */
78 lock_waiter_t *next; /* next in list */
82 /* lock_record_t ***************************************************************
84 Lock record struct representing an inflated ("fat") lock.
86 *******************************************************************************/
88 struct lock_record_t {
89 struct threadobject *owner; /* current owner of this monitor */
90 s4 count; /* recursive lock count */
91 pthread_mutex_t mutex; /* mutex for synchronizing */
92 lock_waiter_t *waiters; /* list of threads waiting */
93 lock_record_t *nextfree; /* next in free list */
97 /* XXXXXXXXXXXXXXXXX ***********************************************************
99 *******************************************************************************/
101 struct lock_record_pool_header_t {
102 lock_record_pool_t *next; /* next pool */
103 int size; /* records in this pool */
107 /* XXXXXXXXXXXXXXXXX ***********************************************************
109 *******************************************************************************/
111 struct lock_record_pool_t {
112 lock_record_pool_header_t header; /* pool header (see above) */
113 lock_record_t lr[1]; /* variable array of records */
117 /* functions ******************************************************************/
119 void lock_init(void);
121 void lock_init_execution_env(struct threadobject *thread);
122 void lock_record_free_pools(lock_record_pool_t *pool);
124 void lock_init_object_lock(java_objectheader *);
125 lock_record_t *lock_get_initial_lock_word(void);
127 lock_record_t *lock_monitor_enter(struct threadobject *, java_objectheader *);
128 bool lock_monitor_exit(struct threadobject *, java_objectheader *);
130 bool lock_does_thread_hold_lock(struct threadobject *t, java_objectheader *o);
132 void lock_wait_for_object(java_objectheader *o, s8 millis, s4 nanos);
133 void lock_notify_object(java_objectheader *o);
134 void lock_notify_all_object(java_objectheader *o);
140 * These are local overrides for various environment variables in Emacs.
141 * Please do not remove this and leave it at the end of the file, where
142 * Emacs will automagically detect them.
143 * ---------------------------------------------------------------------
146 * indent-tabs-mode: t
150 * vim:noexpandtab:sw=4:ts=4: