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

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Sun Jan 10 07:23:34 2010 UTC (10 years, 4 months ago) by siliconforks
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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 siliconforks 507 (defined(_WIN64) && (defined(_M_AMD64) || defined(_M_X64))) || \
59     (defined(__i386) && (defined(__GNUC__) || defined(__SUNPRO_CC))) || \
60     (defined(__x86_64) && (defined(__GNUC__) || defined(__SUNPRO_CC))) || \
61     (defined(__sparc) && (defined(__GNUC__) || defined(__SUNPRO_CC))) || \
62 siliconforks 332 defined(AIX) || \
63     defined(USE_ARM_KUSER)
64     # define JS_HAS_NATIVE_COMPARE_AND_SWAP 1
65     #else
66     # define JS_HAS_NATIVE_COMPARE_AND_SWAP 0
67     #endif
68    
69     #if defined(JS_USE_ONLY_NSPR_LOCKS) || !JS_HAS_NATIVE_COMPARE_AND_SWAP
70     # define NSPR_LOCK 1
71     #else
72     # undef NSPR_LOCK
73     #endif
74    
75     #define Thin_GetWait(W) ((jsword)(W) & 0x1)
76     #define Thin_SetWait(W) ((jsword)(W) | 0x1)
77     #define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
78    
79     typedef struct JSFatLock JSFatLock;
80    
81     typedef struct JSThinLock {
82     jsword owner;
83     JSFatLock *fat;
84     } JSThinLock;
85    
86     #define CX_THINLOCK_ID(cx) ((jsword)(cx)->thread)
87     #define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId())
88    
89     typedef PRLock JSLock;
90    
91     typedef struct JSTitle JSTitle;
92    
93     struct JSTitle {
94     JSContext *ownercx; /* creating context, NULL if shared */
95     JSThinLock lock; /* binary semaphore protecting title */
96     union { /* union lockful and lock-free state: */
97     jsrefcount count; /* lock entry count for reentrancy */
98     JSTitle *link; /* next link in rt->titleSharingTodo */
99     } u;
100     #ifdef JS_DEBUG_TITLE_LOCKS
101     const char *file[4]; /* file where lock was (re-)taken */
102     unsigned int line[4]; /* line where lock was (re-)taken */
103     #endif
104     };
105    
106     /*
107 siliconforks 460 * Title structure is always allocated as a field of JSScope.
108 siliconforks 332 */
109 siliconforks 460 #define TITLE_TO_SCOPE(title) \
110     ((JSScope *)((uint8 *) (title) - offsetof(JSScope, title)))
111 siliconforks 332
112     /*
113     * Atomic increment and decrement for a reference counter, given jsrefcount *p.
114     * NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
115     */
116     #define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
117     #define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
118     #define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
119 siliconforks 460 #define JS_ATOMIC_SET(p,v) PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v))
120 siliconforks 332
121     #define js_CurrentThreadId() (jsword)PR_GetCurrentThread()
122     #define JS_NEW_LOCK() PR_NewLock()
123     #define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
124     #define JS_ACQUIRE_LOCK(l) PR_Lock(l)
125     #define JS_RELEASE_LOCK(l) PR_Unlock(l)
126    
127     #define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
128     #define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
129     #define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
130     #define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
131     #define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
132     #define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
133    
134     #ifdef JS_DEBUG_TITLE_LOCKS
135    
136 siliconforks 460 #define JS_SET_OBJ_INFO(obj_, file_, line_) \
137     JS_SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_)
138 siliconforks 332
139 siliconforks 460 #define JS_SET_SCOPE_INFO(scope_, file_, line_) \
140 siliconforks 332 js_SetScopeInfo(scope_, file_, line_)
141    
142     #endif
143    
144     #define JS_LOCK(cx, tl) js_Lock(cx, tl)
145     #define JS_UNLOCK(cx, tl) js_Unlock(cx, tl)
146    
147     #define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
148     #define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
149    
150     /*
151     * NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
152     * (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
153     * the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
154     * are for optimizations above the JSObjectOps layer, under which object locks
155     * normally hide.
156     */
157 siliconforks 460 #define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
158     ? (void)0 \
159     : (js_LockObj(cx, obj), \
160     JS_SET_OBJ_INFO(obj,__FILE__,__LINE__)))
161     #define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \
162 siliconforks 332 ? (void)0 : js_UnlockObj(cx, obj))
163    
164 siliconforks 507 /*
165     * Lock object only if its scope has the given shape.
166     */
167     #define JS_LOCK_OBJ_IF_SHAPE(cx,obj,shape) \
168     (OBJ_SHAPE(obj) == (shape) \
169     ? (OBJ_SCOPE(obj)->title.ownercx == (cx) \
170     ? true \
171     : js_LockObjIfShape(cx, obj, shape)) \
172     : false)
173    
174 siliconforks 460 #define JS_LOCK_TITLE(cx,title) \
175     ((title)->ownercx == (cx) ? (void)0 \
176     : (js_LockTitle(cx, (title)), \
177     JS_SET_TITLE_INFO(title,__FILE__,__LINE__)))
178 siliconforks 332
179 siliconforks 460 #define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \
180 siliconforks 332 : js_UnlockTitle(cx, title))
181    
182     #define JS_LOCK_SCOPE(cx,scope) JS_LOCK_TITLE(cx,&(scope)->title)
183     #define JS_UNLOCK_SCOPE(cx,scope) JS_UNLOCK_TITLE(cx,&(scope)->title)
184    
185 siliconforks 460 #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
186 siliconforks 332 js_TransferTitle(cx, &scope->title, &newscope->title)
187    
188    
189     extern void js_Lock(JSContext *cx, JSThinLock *tl);
190     extern void js_Unlock(JSContext *cx, JSThinLock *tl);
191     extern void js_LockRuntime(JSRuntime *rt);
192     extern void js_UnlockRuntime(JSRuntime *rt);
193     extern void js_LockObj(JSContext *cx, JSObject *obj);
194     extern void js_UnlockObj(JSContext *cx, JSObject *obj);
195 siliconforks 507 #ifdef __cplusplus /* Allow inclusion from LiveConnect C files. */
196     extern bool js_LockObjIfShape(JSContext *cx, JSObject *obj, uint32 shape);
197     #else
198     extern JSBool js_LockObjIfShape(JSContext *cx, JSObject *obj, uint32 shape);
199     #endif
200 siliconforks 332 extern void js_InitTitle(JSContext *cx, JSTitle *title);
201     extern void js_FinishTitle(JSContext *cx, JSTitle *title);
202     extern void js_LockTitle(JSContext *cx, JSTitle *title);
203     extern void js_UnlockTitle(JSContext *cx, JSTitle *title);
204     extern int js_SetupLocks(int,int);
205     extern void js_CleanupLocks();
206     extern void js_TransferTitle(JSContext *, JSTitle *, JSTitle *);
207     extern JS_FRIEND_API(jsval)
208     js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
209     extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
210     extern void js_InitLock(JSThinLock *);
211     extern void js_FinishLock(JSThinLock *);
212    
213 siliconforks 460 /*
214     * This function must be called with the GC lock held.
215     */
216     extern void
217     js_ShareWaitingTitles(JSContext *cx);
218    
219     extern void
220     js_NudgeOtherContexts(JSContext *cx);
221    
222 siliconforks 332 #ifdef DEBUG
223    
224     #define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
225     #define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
226     #define JS_IS_TITLE_LOCKED(cx,title) js_IsTitleLocked(cx,title)
227    
228     extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
229     extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
230     extern JSBool js_IsTitleLocked(JSContext *cx, JSTitle *title);
231     #ifdef JS_DEBUG_TITLE_LOCKS
232     extern void js_SetScopeInfo(JSScope *scope, const char *file, int line);
233     #endif
234    
235     #else
236    
237     #define JS_IS_RUNTIME_LOCKED(rt) 0
238     #define JS_IS_OBJ_LOCKED(cx,obj) 1
239     #define JS_IS_TITLE_LOCKED(cx,title) 1
240    
241     #endif /* DEBUG */
242    
243     #else /* !JS_THREADSAFE */
244    
245     #define JS_ATOMIC_INCREMENT(p) (++*(p))
246     #define JS_ATOMIC_DECREMENT(p) (--*(p))
247     #define JS_ATOMIC_ADD(p,v) (*(p) += (v))
248 siliconforks 460 #define JS_ATOMIC_SET(p,v) (*(p) = (v))
249 siliconforks 332
250     #define JS_CurrentThreadId() 0
251     #define JS_NEW_LOCK() NULL
252     #define JS_DESTROY_LOCK(l) ((void)0)
253     #define JS_ACQUIRE_LOCK(l) ((void)0)
254     #define JS_RELEASE_LOCK(l) ((void)0)
255     #define JS_LOCK(cx, tl) ((void)0)
256     #define JS_UNLOCK(cx, tl) ((void)0)
257    
258     #define JS_NEW_CONDVAR(l) NULL
259     #define JS_DESTROY_CONDVAR(cv) ((void)0)
260     #define JS_WAIT_CONDVAR(cv,to) ((void)0)
261     #define JS_NOTIFY_CONDVAR(cv) ((void)0)
262     #define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
263    
264     #define JS_LOCK_RUNTIME(rt) ((void)0)
265     #define JS_UNLOCK_RUNTIME(rt) ((void)0)
266     #define JS_LOCK_OBJ(cx,obj) ((void)0)
267     #define JS_UNLOCK_OBJ(cx,obj) ((void)0)
268 siliconforks 507 #define JS_LOCK_OBJ_IF_SHAPE(cx,obj,shape) (OBJ_SHAPE(obj) == (shape))
269    
270 siliconforks 332 #define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
271     #define JS_LOCK_SCOPE(cx,scope) ((void)0)
272     #define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
273     #define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
274    
275     #define JS_IS_RUNTIME_LOCKED(rt) 1
276     #define JS_IS_OBJ_LOCKED(cx,obj) 1
277     #define JS_IS_TITLE_LOCKED(cx,title) 1
278    
279     #endif /* !JS_THREADSAFE */
280    
281     #define JS_LOCK_RUNTIME_VOID(rt,e) \
282     JS_BEGIN_MACRO \
283     JS_LOCK_RUNTIME(rt); \
284     e; \
285     JS_UNLOCK_RUNTIME(rt); \
286     JS_END_MACRO
287    
288     #define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
289     #define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
290     #define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
291     #define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
292     #define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
293     JS_NO_TIMEOUT)
294     #define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
295    
296 siliconforks 460 #ifndef JS_SET_OBJ_INFO
297     #define JS_SET_OBJ_INFO(obj,f,l) ((void)0)
298 siliconforks 332 #endif
299 siliconforks 460 #ifndef JS_SET_TITLE_INFO
300     #define JS_SET_TITLE_INFO(title,f,l) ((void)0)
301 siliconforks 332 #endif
302    
303     #ifdef JS_THREADSAFE
304    
305     extern JSBool
306     js_CompareAndSwap(jsword *w, jsword ov, jsword nv);
307    
308 siliconforks 460 /* Atomically bitwise-or the mask into the word *w using compare and swap. */
309     extern void
310     js_AtomicSetMask(jsword *w, jsword mask);
311    
312     #define JS_ATOMIC_SET_MASK(w, mask) js_AtomicSetMask(w, mask)
313    
314 siliconforks 332 #else
315    
316     static inline JSBool
317     js_CompareAndSwap(jsword *w, jsword ov, jsword nv)
318     {
319     return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE;
320     }
321    
322 siliconforks 460 #define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask))
323 siliconforks 332
324 siliconforks 460 #endif /* JS_THREADSAFE */
325    
326 siliconforks 332 JS_END_EXTERN_C
327    
328     #endif /* jslock_h___ */

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