Line data Source code
1 : /* src/threads/lock.hpp - lock implementation
2 :
3 : Copyright (C) 1996-2013
4 : CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
5 :
6 : This file is part of CACAO.
7 :
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.
12 :
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.
17 :
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
21 : 02110-1301, USA.
22 :
23 : */
24 :
25 :
26 : #ifndef LOCK_HPP_
27 : #define LOCK_HPP_ 1
28 :
29 : #include "native/llni.hpp"
30 :
31 : #include "threads/mutex.hpp"
32 :
33 : #include "vm/global.hpp"
34 :
35 20333 : template <class T> class List;
36 :
37 : /* typedefs *******************************************************************/
38 :
39 : typedef struct lock_record_t lock_record_t;
40 : typedef struct lock_hashtable_t lock_hashtable_t;
41 :
42 :
43 : /* lock_record_t ***************************************************************
44 :
45 : Lock record struct representing an inflated ("fat") lock.
46 :
47 : *******************************************************************************/
48 :
49 : struct lock_record_t {
50 : java_object_t *object; /* object for which this lock is */
51 : struct threadobject *owner; /* current owner of this monitor */
52 : s4 count; /* recursive lock count */
53 : Mutex* mutex; /* mutex for synchronizing */
54 : List<threadobject*>* waiters; /* list of threads waiting */
55 : lock_record_t *hashlink; /* next record in hash chain */
56 : };
57 :
58 :
59 : /* lock_hashtable_t ************************************************************
60 :
61 : The global hashtable mapping objects to lock records.
62 :
63 : *******************************************************************************/
64 :
65 : struct lock_hashtable_t {
66 : Mutex* mutex; /* mutex for synch. access to the table */
67 : u4 size; /* number of slots */
68 : u4 entries; /* current number of entries */
69 : lock_record_t **ptr; /* the table of slots, uses ext. chain. */
70 : };
71 :
72 :
73 : /* functions ******************************************************************/
74 :
75 : void lock_init(void);
76 :
77 : bool lock_monitor_enter(java_handle_t *);
78 : bool lock_monitor_exit(java_handle_t *);
79 :
80 : bool lock_is_held_by_current_thread(java_handle_t *o);
81 :
82 : void lock_wait_for_object(java_handle_t *o, s8 millis, s4 nanos);
83 : void lock_notify_object(java_handle_t *o);
84 : void lock_notify_all_object(java_handle_t *o);
85 :
86 : #if defined(ENABLE_GC_BOEHM)
87 : void lock_schedule_lockrecord_removal(java_handle_t *o);
88 : #endif
89 :
90 :
91 : /* defines ********************************************************************/
92 :
93 : #define LOCK_MONITOR_ENTER(o) lock_monitor_enter((java_handle_t *) LLNI_QUICKWRAP(o))
94 : #define LOCK_MONITOR_EXIT(o) lock_monitor_exit((java_handle_t *) LLNI_QUICKWRAP(o))
95 :
96 : #endif // LOCK_HPP_
97 :
98 :
99 : /*
100 : * These are local overrides for various environment variables in Emacs.
101 : * Please do not remove this and leave it at the end of the file, where
102 : * Emacs will automagically detect them.
103 : * ---------------------------------------------------------------------
104 : * Local variables:
105 : * mode: c++
106 : * indent-tabs-mode: t
107 : * c-basic-offset: 4
108 : * tab-width: 4
109 : * End:
110 : * vim:noexpandtab:sw=4:ts=4:
111 : */
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