1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jslock_h__
#define jslock_h__
#include "jstypes.h"
#include "jsprvtd.h" /* for JSScope, etc. */
#include "jspubtd.h" /* for JSRuntime, etc. */
#ifdef JS_THREADSAFE
# include "pratom.h"
# include "prlock.h"
# include "prcvar.h"
# include "prthread.h"
#endif
JS_BEGIN_EXTERN_C
#ifdef JS_THREADSAFE
#if (defined(_WIN32) && defined(_M_IX86)) || \
(defined(__GNUC__) && defined(__i386__)) || \
(defined(__GNUC__) && defined(__x86_64__)) || \
(defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \
defined(AIX) || \
defined(USE_ARM_KUSER)
# define JS_HAS_NATIVE_COMPARE_AND_SWAP 1
#else
# define JS_HAS_NATIVE_COMPARE_AND_SWAP 0
#endif
#if defined(JS_USE_ONLY_NSPR_LOCKS) || !JS_HAS_NATIVE_COMPARE_AND_SWAP
# define NSPR_LOCK 1
#else
# undef NSPR_LOCK
#endif
#define Thin_GetWait(W) ((jsword)(W) & 0x1)
#define Thin_SetWait(W) ((jsword)(W) | 0x1)
#define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
typedef struct JSFatLock JSFatLock;
typedef struct JSThinLock {
jsword owner;
JSFatLock *fat;
} JSThinLock;
#define CX_THINLOCK_ID(cx) ((jsword)(cx)->thread)
#define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId())
typedef PRLock JSLock;
typedef struct JSTitle JSTitle;
struct JSTitle {
JSContext *ownercx; /* creating context, NULL if shared */
JSThinLock lock; /* binary semaphore protecting title */
union { /* union lockful and lock-free state: */
jsrefcount count; /* lock entry count for reentrancy */
JSTitle *link; /* next link in rt->titleSharingTodo */
} u;
#ifdef JS_DEBUG_TITLE_LOCKS
const char *file[4]; /* file where lock was (re-)taken */
unsigned int line[4]; /* line where lock was (re-)taken */
#endif
};
/*
* Title structures must be immediately preceded by JSObjectMap structures for
* maps that use titles for threadsafety. This is enforced by assertion in
* jsscope.h; see bug 408416 for future remedies to this somewhat fragile
* architecture.
*/
#define TITLE_TO_MAP(title) \
((JSObjectMap *)((char *)(title) - sizeof(JSObjectMap)))
/*
* Atomic increment and decrement for a reference counter, given jsrefcount *p.
* NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
*/
#define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
#define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
#define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
#define js_CurrentThreadId() (jsword)PR_GetCurrentThread()
#define JS_NEW_LOCK() PR_NewLock()
#define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
#define JS_ACQUIRE_LOCK(l) PR_Lock(l)
#define JS_RELEASE_LOCK(l) PR_Unlock(l)
#define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
#define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
#define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
#define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
#define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
#define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
#ifdef JS_DEBUG_TITLE_LOCKS
#define SET_OBJ_INFO(obj_, file_, line_) \
SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_)
#define SET_SCOPE_INFO(scope_, file_, line_) \
js_SetScopeInfo(scope_, file_, line_)
#endif
#define JS_LOCK(cx, tl) js_Lock(cx, tl)
#define JS_UNLOCK(cx, tl) js_Unlock(cx, tl)
#define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
#define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
/*
* NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
* (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
* the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
* are for optimizations above the JSObjectOps layer, under which object locks
* normally hide.
*/
#define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
? (void)0 \
: (js_LockObj(cx, obj), \
SET_OBJ_INFO(obj,__FILE__,__LINE__)))
#define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
? (void)0 : js_UnlockObj(cx, obj))
#define JS_LOCK_TITLE(cx,title) \
((title)->ownercx == (cx) ? (void)0 \
: (js_LockTitle(cx, (title)), \
SET_TITLE_INFO(title,__FILE__,__LINE__)))
#define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \
: js_UnlockTitle(cx, title))
#define JS_LOCK_SCOPE(cx,scope) JS_LOCK_TITLE(cx,&(scope)->title)
#define JS_UNLOCK_SCOPE(cx,scope) JS_UNLOCK_TITLE(cx,&(scope)->title)
#define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
js_TransferTitle(cx, &scope->title, &newscope->title)
extern void js_Lock(JSContext *cx, JSThinLock *tl);
extern void js_Unlock(JSContext *cx, JSThinLock *tl);
extern void js_LockRuntime(JSRuntime *rt);
extern void js_UnlockRuntime(JSRuntime *rt);
extern void js_LockObj(JSContext *cx, JSObject *obj);
extern void js_UnlockObj(JSContext *cx, JSObject *obj);
extern void js_InitTitle(JSContext *cx, JSTitle *title);
extern void js_FinishTitle(JSContext *cx, JSTitle *title);
extern void js_LockTitle(JSContext *cx, JSTitle *title);
extern void js_UnlockTitle(JSContext *cx, JSTitle *title);
extern int js_SetupLocks(int,int);
extern void js_CleanupLocks();
extern void js_TransferTitle(JSContext *, JSTitle *, JSTitle *);
extern JS_FRIEND_API(jsval)
js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
extern void js_InitLock(JSThinLock *);
extern void js_FinishLock(JSThinLock *);
extern void js_FinishSharingTitle(JSContext *cx, JSTitle *title);
#ifdef DEBUG
#define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
#define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
#define JS_IS_TITLE_LOCKED(cx,title) js_IsTitleLocked(cx,title)
extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
extern JSBool js_IsTitleLocked(JSContext *cx, JSTitle *title);
#ifdef JS_DEBUG_TITLE_LOCKS
extern void js_SetScopeInfo(JSScope *scope, const char *file, int line);
#endif
#else
#define JS_IS_RUNTIME_LOCKED(rt) 0
#define JS_IS_OBJ_LOCKED(cx,obj) 1
#define JS_IS_TITLE_LOCKED(cx,title) 1
#endif /* DEBUG */
#define JS_LOCK_OBJ_VOID(cx, obj, e) \
JS_BEGIN_MACRO \
JS_LOCK_OBJ(cx, obj); \
e; \
JS_UNLOCK_OBJ(cx, obj); \
JS_END_MACRO
#define JS_LOCK_VOID(cx, e) \
JS_BEGIN_MACRO \
JSRuntime *_rt = (cx)->runtime; \
JS_LOCK_RUNTIME_VOID(_rt, e); \
JS_END_MACRO
#else /* !JS_THREADSAFE */
#define JS_ATOMIC_INCREMENT(p) (++*(p))
#define JS_ATOMIC_DECREMENT(p) (--*(p))
#define JS_ATOMIC_ADD(p,v) (*(p) += (v))
#define JS_CurrentThreadId() 0
#define JS_NEW_LOCK() NULL
#define JS_DESTROY_LOCK(l) ((void)0)
#define JS_ACQUIRE_LOCK(l) ((void)0)
#define JS_RELEASE_LOCK(l) ((void)0)
#define JS_LOCK(cx, tl) ((void)0)
#define JS_UNLOCK(cx, tl) ((void)0)
#define JS_NEW_CONDVAR(l) NULL
#define JS_DESTROY_CONDVAR(cv) ((void)0)
#define JS_WAIT_CONDVAR(cv,to) ((void)0)
#define JS_NOTIFY_CONDVAR(cv) ((void)0)
#define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
#define JS_LOCK_RUNTIME(rt) ((void)0)
#define JS_UNLOCK_RUNTIME(rt) ((void)0)
#define JS_LOCK_OBJ(cx,obj) ((void)0)
#define JS_UNLOCK_OBJ(cx,obj) ((void)0)
#define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
#define JS_LOCK_SCOPE(cx,scope) ((void)0)
#define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
#define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
#define JS_IS_RUNTIME_LOCKED(rt) 1
#define JS_IS_OBJ_LOCKED(cx,obj) 1
#define JS_IS_TITLE_LOCKED(cx,title) 1
#define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
#endif /* !JS_THREADSAFE */
#define JS_LOCK_RUNTIME_VOID(rt,e) \
JS_BEGIN_MACRO \
JS_LOCK_RUNTIME(rt); \
e; \
JS_UNLOCK_RUNTIME(rt); \
JS_END_MACRO
#define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
#define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
#define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
#define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
#define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
#define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
JS_NO_TIMEOUT)
#define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
#ifndef SET_OBJ_INFO
#define SET_OBJ_INFO(obj,f,l) ((void)0)
#endif
#ifndef SET_TITLE_INFO
#define SET_TITLE_INFO(title,f,l) ((void)0)
#endif
#ifdef JS_THREADSAFE
extern JSBool
js_CompareAndSwap(jsword *w, jsword ov, jsword nv);
#else
static inline JSBool
js_CompareAndSwap(jsword *w, jsword ov, jsword nv)
{
return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE;
}
#endif
JS_END_EXTERN_C
#endif /* jslock_h___ */
|
