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1.1 root 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: #ifdef JS_THREADSAFE
43:
44: #include "jstypes.h"
45: #include "pratom.h"
46: #include "prlock.h"
47: #include "prcvar.h"
48:
49: #include "jsprvtd.h" /* for JSScope, etc. */
50: #include "jspubtd.h" /* for JSRuntime, etc. */
51:
52: #define Thin_GetWait(W) ((jsword)(W) & 0x1)
53: #define Thin_SetWait(W) ((jsword)(W) | 0x1)
54: #define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
55:
56: typedef struct JSFatLock JSFatLock;
57:
58: struct JSFatLock {
59: int susp;
60: PRLock *slock;
61: PRCondVar *svar;
62: JSFatLock *next;
63: JSFatLock **prevp;
64: };
65:
66: typedef struct JSThinLock {
67: jsword owner;
68: JSFatLock *fat;
69: } JSThinLock;
70:
71: typedef PRLock JSLock;
72:
73: typedef struct JSFatLockTable {
74: JSFatLock *free;
75: JSFatLock *taken;
76: } JSFatLockTable;
77:
78: /*
79: * Atomic increment and decrement for a reference counter, given jsrefcount *p.
80: * NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
81: */
82: #define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
83: #define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
84: #define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
85:
86: #define CurrentThreadId() (jsword)PR_GetCurrentThread()
87: #define JS_CurrentThreadId() js_CurrentThreadId()
88: #define JS_NEW_LOCK() PR_NewLock()
89: #define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
90: #define JS_ACQUIRE_LOCK(l) PR_Lock(l)
91: #define JS_RELEASE_LOCK(l) PR_Unlock(l)
92: #define JS_LOCK0(P,M) js_Lock(P,M)
93: #define JS_UNLOCK0(P,M) js_Unlock(P,M)
94:
95: #define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
96: #define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
97: #define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
98: #define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
99: #define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
100: #define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
101:
102: /*
103: * Include jsscope.h so JS_LOCK_OBJ macro callers don't have to include it.
104: * Since there is a JSThinLock member in JSScope, we can't nest this include
105: * much earlier (see JSThinLock's typedef, above). Yes, that means there is
106: * an #include cycle between jslock.h and jsscope.h: moderate-sized XXX here,
107: * to be fixed by moving JS_LOCK_SCOPE to jsscope.h, JS_LOCK_OBJ to jsobj.h,
108: * and so on.
109: *
110: * We also need jsscope.h #ifdef DEBUG for SET_OBJ_INFO and SET_SCOPE_INFO,
111: * but we do not want any nested includes that depend on DEBUG. Those lead
112: * to build bustage when someone makes a change that depends in a subtle way
113: * on jsscope.h being included directly or indirectly, but does not test by
114: * building optimized as well as DEBUG.
115: */
116: #include "jsscope.h"
117:
118: #ifdef DEBUG
119:
120: #define SET_OBJ_INFO(obj_,file_,line_) \
121: SET_SCOPE_INFO(OBJ_SCOPE(obj_),file_,line_)
122:
123: #define SET_SCOPE_INFO(scope_,file_,line_) \
124: ((scope_)->ownercx ? (void)0 : \
125: (JS_ASSERT((0 < (scope_)->u.count && (scope_)->u.count <= 4) || \
126: SCOPE_IS_SEALED(scope_)), \
127: (void)((scope_)->file[(scope_)->u.count-1] = (file_), \
128: (scope_)->line[(scope_)->u.count-1] = (line_))))
129: #endif /* DEBUG */
130:
131: #define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
132: #define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
133:
134: /*
135: * NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
136: * (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
137: * the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
138: * are for optimizations above the JSObjectOps layer, under which object locks
139: * normally hide.
140: */
141: #define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
142: ? (void)0 \
143: : (js_LockObj(cx, obj), \
144: SET_OBJ_INFO(obj,__FILE__,__LINE__)))
145: #define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
146: ? (void)0 : js_UnlockObj(cx, obj))
147:
148: #define JS_LOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 : \
149: (js_LockScope(cx, scope), \
150: SET_SCOPE_INFO(scope,__FILE__,__LINE__)))
151: #define JS_UNLOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 : \
152: js_UnlockScope(cx, scope))
153: #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
154: js_TransferScopeLock(cx, scope, newscope)
155:
156: extern jsword js_CurrentThreadId();
157: extern void js_LockRuntime(JSRuntime *rt);
158: extern void js_UnlockRuntime(JSRuntime *rt);
159: extern void js_LockObj(JSContext *cx, JSObject *obj);
160: extern void js_UnlockObj(JSContext *cx, JSObject *obj);
161: extern void js_LockScope(JSContext *cx, JSScope *scope);
162: extern void js_UnlockScope(JSContext *cx, JSScope *scope);
163: extern int js_SetupLocks(int,int);
164: extern void js_CleanupLocks();
165: extern void js_InitContextForLocking(JSContext *);
166: extern void js_TransferScopeLock(JSContext *, JSScope *, JSScope *);
167: extern JS_FRIEND_API(jsval)
168: js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
169: extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
170: extern void js_InitLock(JSThinLock *);
171: extern void js_FinishLock(JSThinLock *);
172: extern void js_FinishSharingScope(JSRuntime *rt, JSScope *scope);
173:
174: #ifdef DEBUG
175:
176: #define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
177: #define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
178: #define JS_IS_SCOPE_LOCKED(cx,scope) js_IsScopeLocked(cx,scope)
179:
180: extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
181: extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
182: extern JSBool js_IsScopeLocked(JSContext *cx, JSScope *scope);
183:
184: #else
185:
186: #define JS_IS_RUNTIME_LOCKED(rt) 0
187: #define JS_IS_OBJ_LOCKED(cx,obj) 1
188: #define JS_IS_SCOPE_LOCKED(cx,scope) 1
189:
190: #endif /* DEBUG */
191:
192: #define JS_LOCK_OBJ_VOID(cx, obj, e) \
193: JS_BEGIN_MACRO \
194: JS_LOCK_OBJ(cx, obj); \
195: e; \
196: JS_UNLOCK_OBJ(cx, obj); \
197: JS_END_MACRO
198:
199: #define JS_LOCK_VOID(cx, e) \
200: JS_BEGIN_MACRO \
201: JSRuntime *_rt = (cx)->runtime; \
202: JS_LOCK_RUNTIME_VOID(_rt, e); \
203: JS_END_MACRO
204:
205: #if defined(JS_USE_ONLY_NSPR_LOCKS) || \
206: !( (defined(_WIN32) && defined(_M_IX86)) || \
207: (defined(__GNUC__) && defined(__i386__)) || \
208: (defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \
209: defined(AIX) )
210:
211: #define NSPR_LOCK 1
212:
213: #undef JS_LOCK0
214: #undef JS_UNLOCK0
215: #define JS_LOCK0(P,M) (JS_ACQUIRE_LOCK(((JSLock*)(P)->fat)), (P)->owner = (M))
216: #define JS_UNLOCK0(P,M) ((P)->owner = 0, JS_RELEASE_LOCK(((JSLock*)(P)->fat)))
217:
218: #else /* arch-tests */
219:
220: #undef NSPR_LOCK
221:
222: extern JS_INLINE void js_Lock(JSThinLock *tl, jsword me);
223: extern JS_INLINE void js_Unlock(JSThinLock *tl, jsword me);
224:
225: #endif /* arch-tests */
226:
227: #else /* !JS_THREADSAFE */
228:
229: #define JS_ATOMIC_INCREMENT(p) (++*(p))
230: #define JS_ATOMIC_DECREMENT(p) (--*(p))
231: #define JS_ATOMIC_ADD(p,v) (*(p) += (v))
232:
233: #define JS_CurrentThreadId() 0
234: #define JS_NEW_LOCK() NULL
235: #define JS_DESTROY_LOCK(l) ((void)0)
236: #define JS_ACQUIRE_LOCK(l) ((void)0)
237: #define JS_RELEASE_LOCK(l) ((void)0)
238: #define JS_LOCK0(P,M) ((void)0)
239: #define JS_UNLOCK0(P,M) ((void)0)
240:
241: #define JS_NEW_CONDVAR(l) NULL
242: #define JS_DESTROY_CONDVAR(cv) ((void)0)
243: #define JS_WAIT_CONDVAR(cv,to) ((void)0)
244: #define JS_NOTIFY_CONDVAR(cv) ((void)0)
245: #define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
246:
247: #define JS_LOCK_RUNTIME(rt) ((void)0)
248: #define JS_UNLOCK_RUNTIME(rt) ((void)0)
249: #define JS_LOCK_OBJ(cx,obj) ((void)0)
250: #define JS_UNLOCK_OBJ(cx,obj) ((void)0)
251: #define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
252: #define JS_LOCK_SCOPE(cx,scope) ((void)0)
253: #define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
254: #define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
255:
256: #define JS_IS_RUNTIME_LOCKED(rt) 1
257: #define JS_IS_OBJ_LOCKED(cx,obj) 1
258: #define JS_IS_SCOPE_LOCKED(cx,scope) 1
259: #define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
260:
261: #endif /* !JS_THREADSAFE */
262:
263: #define JS_LOCK_RUNTIME_VOID(rt,e) \
264: JS_BEGIN_MACRO \
265: JS_LOCK_RUNTIME(rt); \
266: e; \
267: JS_UNLOCK_RUNTIME(rt); \
268: JS_END_MACRO
269:
270: #define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
271: #define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
272: #define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
273: #define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
274: #define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
275: #define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
276: JS_NO_TIMEOUT)
277: #define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
278:
279: #define JS_LOCK(P,CX) JS_LOCK0(P,(CX)->thread)
280: #define JS_UNLOCK(P,CX) JS_UNLOCK0(P,(CX)->thread)
281:
282: #ifndef SET_OBJ_INFO
283: #define SET_OBJ_INFO(obj,f,l) ((void)0)
284: #endif
285: #ifndef SET_SCOPE_INFO
286: #define SET_SCOPE_INFO(scope,f,l) ((void)0)
287: #endif
288:
289: #endif /* jslock_h___ */
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