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Contents of /trunk/js/jslock.h

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1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Netscape Communications Corporation.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
39 #ifndef jslock_h__
40 #define jslock_h__
41
42 #include "jstypes.h"
43 #include "jsprvtd.h" /* for JSScope, etc. */
44 #include "jspubtd.h" /* for JSRuntime, etc. */
45
46 #ifdef JS_THREADSAFE
47 # include "pratom.h"
48 # include "prlock.h"
49 # include "prcvar.h"
50 # include "prthread.h"
51 #endif
52
53 JS_BEGIN_EXTERN_C
54
55 #ifdef JS_THREADSAFE
56
57 #if (defined(_WIN32) && defined(_M_IX86)) || \
58 (defined(__GNUC__) && defined(__i386__)) || \
59 (defined(__GNUC__) && defined(__x86_64__)) || \
60 (defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \
61 defined(AIX) || \
62 defined(USE_ARM_KUSER)
63 # define JS_HAS_NATIVE_COMPARE_AND_SWAP 1
64 #else
65 # define JS_HAS_NATIVE_COMPARE_AND_SWAP 0
66 #endif
67
68 #if defined(JS_USE_ONLY_NSPR_LOCKS) || !JS_HAS_NATIVE_COMPARE_AND_SWAP
69 # define NSPR_LOCK 1
70 #else
71 # undef NSPR_LOCK
72 #endif
73
74 #define Thin_GetWait(W) ((jsword)(W) & 0x1)
75 #define Thin_SetWait(W) ((jsword)(W) | 0x1)
76 #define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
77
78 typedef struct JSFatLock JSFatLock;
79
80 typedef struct JSThinLock {
81 jsword owner;
82 JSFatLock *fat;
83 } JSThinLock;
84
85 #define CX_THINLOCK_ID(cx) ((jsword)(cx)->thread)
86 #define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId())
87
88 typedef PRLock JSLock;
89
90 typedef struct JSTitle JSTitle;
91
92 struct JSTitle {
93 JSContext *ownercx; /* creating context, NULL if shared */
94 JSThinLock lock; /* binary semaphore protecting title */
95 union { /* union lockful and lock-free state: */
96 jsrefcount count; /* lock entry count for reentrancy */
97 JSTitle *link; /* next link in rt->titleSharingTodo */
98 } u;
99 #ifdef JS_DEBUG_TITLE_LOCKS
100 const char *file[4]; /* file where lock was (re-)taken */
101 unsigned int line[4]; /* line where lock was (re-)taken */
102 #endif
103 };
104
105 /*
106 * Title structure is always allocated as a field of JSScope.
107 */
108 #define TITLE_TO_SCOPE(title) \
109 ((JSScope *)((uint8 *) (title) - offsetof(JSScope, title)))
110
111 /*
112 * Atomic increment and decrement for a reference counter, given jsrefcount *p.
113 * NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
114 */
115 #define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
116 #define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
117 #define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
118 #define JS_ATOMIC_SET(p,v) PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v))
119
120 #define js_CurrentThreadId() (jsword)PR_GetCurrentThread()
121 #define JS_NEW_LOCK() PR_NewLock()
122 #define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
123 #define JS_ACQUIRE_LOCK(l) PR_Lock(l)
124 #define JS_RELEASE_LOCK(l) PR_Unlock(l)
125
126 #define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
127 #define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
128 #define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
129 #define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
130 #define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
131 #define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
132
133 #ifdef JS_DEBUG_TITLE_LOCKS
134
135 #define JS_SET_OBJ_INFO(obj_, file_, line_) \
136 JS_SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_)
137
138 #define JS_SET_SCOPE_INFO(scope_, file_, line_) \
139 js_SetScopeInfo(scope_, file_, line_)
140
141 #endif
142
143 #define JS_LOCK(cx, tl) js_Lock(cx, tl)
144 #define JS_UNLOCK(cx, tl) js_Unlock(cx, tl)
145
146 #define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
147 #define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
148
149 /*
150 * NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
151 * (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
152 * the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
153 * are for optimizations above the JSObjectOps layer, under which object locks
154 * normally hide.
155 */
156 #define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
157 ? (void)0 \
158 : (js_LockObj(cx, obj), \
159 JS_SET_OBJ_INFO(obj,__FILE__,__LINE__)))
160 #define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
161 ? (void)0 : js_UnlockObj(cx, obj))
162
163 #define JS_LOCK_TITLE(cx,title) \
164 ((title)->ownercx == (cx) ? (void)0 \
165 : (js_LockTitle(cx, (title)), \
166 JS_SET_TITLE_INFO(title,__FILE__,__LINE__)))
167
168 #define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \
169 : js_UnlockTitle(cx, title))
170
171 #define JS_LOCK_SCOPE(cx,scope) JS_LOCK_TITLE(cx,&(scope)->title)
172 #define JS_UNLOCK_SCOPE(cx,scope) JS_UNLOCK_TITLE(cx,&(scope)->title)
173
174 #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
175 js_TransferTitle(cx, &scope->title, &newscope->title)
176
177
178 extern void js_Lock(JSContext *cx, JSThinLock *tl);
179 extern void js_Unlock(JSContext *cx, JSThinLock *tl);
180 extern void js_LockRuntime(JSRuntime *rt);
181 extern void js_UnlockRuntime(JSRuntime *rt);
182 extern void js_LockObj(JSContext *cx, JSObject *obj);
183 extern void js_UnlockObj(JSContext *cx, JSObject *obj);
184 extern void js_InitTitle(JSContext *cx, JSTitle *title);
185 extern void js_FinishTitle(JSContext *cx, JSTitle *title);
186 extern void js_LockTitle(JSContext *cx, JSTitle *title);
187 extern void js_UnlockTitle(JSContext *cx, JSTitle *title);
188 extern int js_SetupLocks(int,int);
189 extern void js_CleanupLocks();
190 extern void js_TransferTitle(JSContext *, JSTitle *, JSTitle *);
191 extern JS_FRIEND_API(jsval)
192 js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
193 extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
194 extern void js_InitLock(JSThinLock *);
195 extern void js_FinishLock(JSThinLock *);
196
197 /*
198 * This function must be called with the GC lock held.
199 */
200 extern void
201 js_ShareWaitingTitles(JSContext *cx);
202
203 extern void
204 js_NudgeOtherContexts(JSContext *cx);
205
206 #ifdef DEBUG
207
208 #define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
209 #define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
210 #define JS_IS_TITLE_LOCKED(cx,title) js_IsTitleLocked(cx,title)
211
212 extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
213 extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
214 extern JSBool js_IsTitleLocked(JSContext *cx, JSTitle *title);
215 #ifdef JS_DEBUG_TITLE_LOCKS
216 extern void js_SetScopeInfo(JSScope *scope, const char *file, int line);
217 #endif
218
219 #else
220
221 #define JS_IS_RUNTIME_LOCKED(rt) 0
222 #define JS_IS_OBJ_LOCKED(cx,obj) 1
223 #define JS_IS_TITLE_LOCKED(cx,title) 1
224
225 #endif /* DEBUG */
226
227 #define JS_LOCK_OBJ_VOID(cx, obj, e) \
228 JS_BEGIN_MACRO \
229 JS_LOCK_OBJ(cx, obj); \
230 e; \
231 JS_UNLOCK_OBJ(cx, obj); \
232 JS_END_MACRO
233
234 #define JS_LOCK_VOID(cx, e) \
235 JS_BEGIN_MACRO \
236 JSRuntime *_rt = (cx)->runtime; \
237 JS_LOCK_RUNTIME_VOID(_rt, e); \
238 JS_END_MACRO
239
240 #else /* !JS_THREADSAFE */
241
242 #define JS_ATOMIC_INCREMENT(p) (++*(p))
243 #define JS_ATOMIC_DECREMENT(p) (--*(p))
244 #define JS_ATOMIC_ADD(p,v) (*(p) += (v))
245 #define JS_ATOMIC_SET(p,v) (*(p) = (v))
246
247 #define JS_CurrentThreadId() 0
248 #define JS_NEW_LOCK() NULL
249 #define JS_DESTROY_LOCK(l) ((void)0)
250 #define JS_ACQUIRE_LOCK(l) ((void)0)
251 #define JS_RELEASE_LOCK(l) ((void)0)
252 #define JS_LOCK(cx, tl) ((void)0)
253 #define JS_UNLOCK(cx, tl) ((void)0)
254
255 #define JS_NEW_CONDVAR(l) NULL
256 #define JS_DESTROY_CONDVAR(cv) ((void)0)
257 #define JS_WAIT_CONDVAR(cv,to) ((void)0)
258 #define JS_NOTIFY_CONDVAR(cv) ((void)0)
259 #define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
260
261 #define JS_LOCK_RUNTIME(rt) ((void)0)
262 #define JS_UNLOCK_RUNTIME(rt) ((void)0)
263 #define JS_LOCK_OBJ(cx,obj) ((void)0)
264 #define JS_UNLOCK_OBJ(cx,obj) ((void)0)
265 #define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
266 #define JS_LOCK_SCOPE(cx,scope) ((void)0)
267 #define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
268 #define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
269
270 #define JS_IS_RUNTIME_LOCKED(rt) 1
271 #define JS_IS_OBJ_LOCKED(cx,obj) 1
272 #define JS_IS_TITLE_LOCKED(cx,title) 1
273 #define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
274
275 #endif /* !JS_THREADSAFE */
276
277 #define JS_LOCK_RUNTIME_VOID(rt,e) \
278 JS_BEGIN_MACRO \
279 JS_LOCK_RUNTIME(rt); \
280 e; \
281 JS_UNLOCK_RUNTIME(rt); \
282 JS_END_MACRO
283
284 #define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
285 #define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
286 #define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
287 #define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
288 #define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
289 #define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
290 JS_NO_TIMEOUT)
291 #define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
292
293 #ifndef JS_SET_OBJ_INFO
294 #define JS_SET_OBJ_INFO(obj,f,l) ((void)0)
295 #endif
296 #ifndef JS_SET_TITLE_INFO
297 #define JS_SET_TITLE_INFO(title,f,l) ((void)0)
298 #endif
299
300 #ifdef JS_THREADSAFE
301
302 extern JSBool
303 js_CompareAndSwap(jsword *w, jsword ov, jsword nv);
304
305 /* Atomically bitwise-or the mask into the word *w using compare and swap. */
306 extern void
307 js_AtomicSetMask(jsword *w, jsword mask);
308
309 #define JS_ATOMIC_SET_MASK(w, mask) js_AtomicSetMask(w, mask)
310
311 #else
312
313 static inline JSBool
314 js_CompareAndSwap(jsword *w, jsword ov, jsword nv)
315 {
316 return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE;
317 }
318
319 #define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask))
320
321 #endif /* JS_THREADSAFE */
322
323 JS_END_EXTERN_C
324
325 #endif /* jslock_h___ */

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