/[jscoverage]/trunk/js/jslock.h
ViewVC logotype

Annotation of /trunk/js/jslock.h

Parent Directory Parent Directory | Revision Log Revision Log


Revision 460 - (hide annotations)
Sat Sep 26 23:15:22 2009 UTC (10 years, 6 months ago) by siliconforks
File MIME type: text/plain
File size: 12720 byte(s)
Upgrade to SpiderMonkey from Firefox 3.5.3.

1 siliconforks 332 /* -*- 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 siliconforks 460 * Title structure is always allocated as a field of JSScope.
107 siliconforks 332 */
108 siliconforks 460 #define TITLE_TO_SCOPE(title) \
109     ((JSScope *)((uint8 *) (title) - offsetof(JSScope, title)))
110 siliconforks 332
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 siliconforks 460 #define JS_ATOMIC_SET(p,v) PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v))
119 siliconforks 332
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 siliconforks 460 #define JS_SET_OBJ_INFO(obj_, file_, line_) \
136     JS_SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_)
137 siliconforks 332
138 siliconforks 460 #define JS_SET_SCOPE_INFO(scope_, file_, line_) \
139 siliconforks 332 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 siliconforks 460 #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 siliconforks 332 ? (void)0 : js_UnlockObj(cx, obj))
162    
163 siliconforks 460 #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 siliconforks 332
168 siliconforks 460 #define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \
169 siliconforks 332 : 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 siliconforks 460 #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
175 siliconforks 332 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 siliconforks 460 /*
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 siliconforks 332 #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 siliconforks 460 #define JS_ATOMIC_SET(p,v) (*(p) = (v))
246 siliconforks 332
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 siliconforks 460 #ifndef JS_SET_OBJ_INFO
294     #define JS_SET_OBJ_INFO(obj,f,l) ((void)0)
295 siliconforks 332 #endif
296 siliconforks 460 #ifndef JS_SET_TITLE_INFO
297     #define JS_SET_TITLE_INFO(title,f,l) ((void)0)
298 siliconforks 332 #endif
299    
300     #ifdef JS_THREADSAFE
301    
302     extern JSBool
303     js_CompareAndSwap(jsword *w, jsword ov, jsword nv);
304    
305 siliconforks 460 /* 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 siliconforks 332 #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 siliconforks 460 #define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask))
320 siliconforks 332
321 siliconforks 460 #endif /* JS_THREADSAFE */
322    
323 siliconforks 332 JS_END_EXTERN_C
324    
325     #endif /* jslock_h___ */

  ViewVC Help
Powered by ViewVC 1.1.24