/[jscoverage]/trunk/js/jslock.h
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Annotation of /trunk/js/jslock.h

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Revision 332 - (hide annotations)
Thu Oct 23 19:03:33 2008 UTC (11 years, 5 months ago) by siliconforks
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File size: 12394 byte(s)
Add SpiderMonkey from Firefox 3.1b1.

The following directories and files were removed:
correct/, correct.js
liveconnect/
nanojit/
t/
v8/
vprof/
xpconnect/
all JavaScript files (Y.js, call.js, if.js, math-partial-sums.js, md5.js, perfect.js, trace-test.js, trace.js)


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     * Title structures must be immediately preceded by JSObjectMap structures for
107     * maps that use titles for threadsafety. This is enforced by assertion in
108     * jsscope.h; see bug 408416 for future remedies to this somewhat fragile
109     * architecture.
110     */
111    
112     #define TITLE_TO_MAP(title) \
113     ((JSObjectMap *)((char *)(title) - sizeof(JSObjectMap)))
114    
115     /*
116     * Atomic increment and decrement for a reference counter, given jsrefcount *p.
117     * NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
118     */
119     #define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
120     #define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
121     #define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
122    
123     #define js_CurrentThreadId() (jsword)PR_GetCurrentThread()
124     #define JS_NEW_LOCK() PR_NewLock()
125     #define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
126     #define JS_ACQUIRE_LOCK(l) PR_Lock(l)
127     #define JS_RELEASE_LOCK(l) PR_Unlock(l)
128    
129     #define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
130     #define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
131     #define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
132     #define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
133     #define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
134     #define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
135    
136     #ifdef JS_DEBUG_TITLE_LOCKS
137    
138     #define SET_OBJ_INFO(obj_, file_, line_) \
139     SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_)
140    
141     #define SET_SCOPE_INFO(scope_, file_, line_) \
142     js_SetScopeInfo(scope_, file_, line_)
143    
144     #endif
145    
146     #define JS_LOCK(cx, tl) js_Lock(cx, tl)
147     #define JS_UNLOCK(cx, tl) js_Unlock(cx, tl)
148    
149     #define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
150     #define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
151    
152     /*
153     * NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
154     * (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
155     * the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
156     * are for optimizations above the JSObjectOps layer, under which object locks
157     * normally hide.
158     */
159     #define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
160     ? (void)0 \
161     : (js_LockObj(cx, obj), \
162     SET_OBJ_INFO(obj,__FILE__,__LINE__)))
163     #define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
164     ? (void)0 : js_UnlockObj(cx, obj))
165    
166     #define JS_LOCK_TITLE(cx,title) \
167     ((title)->ownercx == (cx) ? (void)0 \
168     : (js_LockTitle(cx, (title)), \
169     SET_TITLE_INFO(title,__FILE__,__LINE__)))
170    
171     #define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \
172     : js_UnlockTitle(cx, title))
173    
174     #define JS_LOCK_SCOPE(cx,scope) JS_LOCK_TITLE(cx,&(scope)->title)
175     #define JS_UNLOCK_SCOPE(cx,scope) JS_UNLOCK_TITLE(cx,&(scope)->title)
176    
177     #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
178     js_TransferTitle(cx, &scope->title, &newscope->title)
179    
180    
181     extern void js_Lock(JSContext *cx, JSThinLock *tl);
182     extern void js_Unlock(JSContext *cx, JSThinLock *tl);
183     extern void js_LockRuntime(JSRuntime *rt);
184     extern void js_UnlockRuntime(JSRuntime *rt);
185     extern void js_LockObj(JSContext *cx, JSObject *obj);
186     extern void js_UnlockObj(JSContext *cx, JSObject *obj);
187     extern void js_InitTitle(JSContext *cx, JSTitle *title);
188     extern void js_FinishTitle(JSContext *cx, JSTitle *title);
189     extern void js_LockTitle(JSContext *cx, JSTitle *title);
190     extern void js_UnlockTitle(JSContext *cx, JSTitle *title);
191     extern int js_SetupLocks(int,int);
192     extern void js_CleanupLocks();
193     extern void js_TransferTitle(JSContext *, JSTitle *, JSTitle *);
194     extern JS_FRIEND_API(jsval)
195     js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
196     extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
197     extern void js_InitLock(JSThinLock *);
198     extern void js_FinishLock(JSThinLock *);
199     extern void js_FinishSharingTitle(JSContext *cx, JSTitle *title);
200    
201     #ifdef DEBUG
202    
203     #define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
204     #define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
205     #define JS_IS_TITLE_LOCKED(cx,title) js_IsTitleLocked(cx,title)
206    
207     extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
208     extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
209     extern JSBool js_IsTitleLocked(JSContext *cx, JSTitle *title);
210     #ifdef JS_DEBUG_TITLE_LOCKS
211     extern void js_SetScopeInfo(JSScope *scope, const char *file, int line);
212     #endif
213    
214     #else
215    
216     #define JS_IS_RUNTIME_LOCKED(rt) 0
217     #define JS_IS_OBJ_LOCKED(cx,obj) 1
218     #define JS_IS_TITLE_LOCKED(cx,title) 1
219    
220     #endif /* DEBUG */
221    
222     #define JS_LOCK_OBJ_VOID(cx, obj, e) \
223     JS_BEGIN_MACRO \
224     JS_LOCK_OBJ(cx, obj); \
225     e; \
226     JS_UNLOCK_OBJ(cx, obj); \
227     JS_END_MACRO
228    
229     #define JS_LOCK_VOID(cx, e) \
230     JS_BEGIN_MACRO \
231     JSRuntime *_rt = (cx)->runtime; \
232     JS_LOCK_RUNTIME_VOID(_rt, e); \
233     JS_END_MACRO
234    
235     #else /* !JS_THREADSAFE */
236    
237     #define JS_ATOMIC_INCREMENT(p) (++*(p))
238     #define JS_ATOMIC_DECREMENT(p) (--*(p))
239     #define JS_ATOMIC_ADD(p,v) (*(p) += (v))
240    
241     #define JS_CurrentThreadId() 0
242     #define JS_NEW_LOCK() NULL
243     #define JS_DESTROY_LOCK(l) ((void)0)
244     #define JS_ACQUIRE_LOCK(l) ((void)0)
245     #define JS_RELEASE_LOCK(l) ((void)0)
246     #define JS_LOCK(cx, tl) ((void)0)
247     #define JS_UNLOCK(cx, tl) ((void)0)
248    
249     #define JS_NEW_CONDVAR(l) NULL
250     #define JS_DESTROY_CONDVAR(cv) ((void)0)
251     #define JS_WAIT_CONDVAR(cv,to) ((void)0)
252     #define JS_NOTIFY_CONDVAR(cv) ((void)0)
253     #define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
254    
255     #define JS_LOCK_RUNTIME(rt) ((void)0)
256     #define JS_UNLOCK_RUNTIME(rt) ((void)0)
257     #define JS_LOCK_OBJ(cx,obj) ((void)0)
258     #define JS_UNLOCK_OBJ(cx,obj) ((void)0)
259     #define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
260     #define JS_LOCK_SCOPE(cx,scope) ((void)0)
261     #define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
262     #define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
263    
264     #define JS_IS_RUNTIME_LOCKED(rt) 1
265     #define JS_IS_OBJ_LOCKED(cx,obj) 1
266     #define JS_IS_TITLE_LOCKED(cx,title) 1
267     #define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
268    
269     #endif /* !JS_THREADSAFE */
270    
271     #define JS_LOCK_RUNTIME_VOID(rt,e) \
272     JS_BEGIN_MACRO \
273     JS_LOCK_RUNTIME(rt); \
274     e; \
275     JS_UNLOCK_RUNTIME(rt); \
276     JS_END_MACRO
277    
278     #define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
279     #define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
280     #define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
281     #define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
282     #define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
283     #define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
284     JS_NO_TIMEOUT)
285     #define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
286    
287     #ifndef SET_OBJ_INFO
288     #define SET_OBJ_INFO(obj,f,l) ((void)0)
289     #endif
290     #ifndef SET_TITLE_INFO
291     #define SET_TITLE_INFO(title,f,l) ((void)0)
292     #endif
293    
294     #ifdef JS_THREADSAFE
295    
296     extern JSBool
297     js_CompareAndSwap(jsword *w, jsword ov, jsword nv);
298    
299     #else
300    
301     static inline JSBool
302     js_CompareAndSwap(jsword *w, jsword ov, jsword nv)
303     {
304     return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE;
305     }
306    
307     #endif
308    
309     JS_END_EXTERN_C
310    
311     #endif /* jslock_h___ */

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