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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"
1.1.1.2 ! root 48: #include "prthread.h"
1.1 root 49:
50: #include "jsprvtd.h" /* for JSScope, etc. */
51: #include "jspubtd.h" /* for JSRuntime, etc. */
52:
53: #define Thin_GetWait(W) ((jsword)(W) & 0x1)
54: #define Thin_SetWait(W) ((jsword)(W) | 0x1)
55: #define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
56:
57: typedef struct JSFatLock JSFatLock;
58:
59: struct JSFatLock {
60: int susp;
61: PRLock *slock;
62: PRCondVar *svar;
63: JSFatLock *next;
64: JSFatLock **prevp;
65: };
66:
67: typedef struct JSThinLock {
68: jsword owner;
69: JSFatLock *fat;
70: } JSThinLock;
71:
1.1.1.2 ! root 72: #define CX_THINLOCK_ID(cx) ((jsword)(cx)->thread)
! 73: #define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId())
! 74:
1.1 root 75: typedef PRLock JSLock;
76:
77: typedef struct JSFatLockTable {
78: JSFatLock *free;
79: JSFatLock *taken;
80: } JSFatLockTable;
81:
82: /*
83: * Atomic increment and decrement for a reference counter, given jsrefcount *p.
84: * NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
85: */
86: #define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
87: #define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
88: #define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
89:
1.1.1.2 ! root 90: #define js_CurrentThreadId() (jsword)PR_GetCurrentThread()
1.1 root 91: #define JS_NEW_LOCK() PR_NewLock()
92: #define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
93: #define JS_ACQUIRE_LOCK(l) PR_Lock(l)
94: #define JS_RELEASE_LOCK(l) PR_Unlock(l)
95: #define JS_LOCK0(P,M) js_Lock(P,M)
96: #define JS_UNLOCK0(P,M) js_Unlock(P,M)
97:
98: #define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
99: #define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
100: #define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
101: #define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
102: #define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
103: #define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
104:
105: /*
106: * Include jsscope.h so JS_LOCK_OBJ macro callers don't have to include it.
107: * Since there is a JSThinLock member in JSScope, we can't nest this include
108: * much earlier (see JSThinLock's typedef, above). Yes, that means there is
109: * an #include cycle between jslock.h and jsscope.h: moderate-sized XXX here,
110: * to be fixed by moving JS_LOCK_SCOPE to jsscope.h, JS_LOCK_OBJ to jsobj.h,
111: * and so on.
112: */
113: #include "jsscope.h"
114:
115: #define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
116: #define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
117:
118: /*
119: * NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
120: * (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
121: * the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
122: * are for optimizations above the JSObjectOps layer, under which object locks
123: * normally hide.
124: */
125: #define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
126: ? (void)0 \
1.1.1.2 ! root 127: : (js_LockObj(cx, obj)))
1.1 root 128: #define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
129: ? (void)0 : js_UnlockObj(cx, obj))
130:
1.1.1.2 ! root 131: #define JS_LOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 \
! 132: : js_LockScope(cx, scope))
! 133: #define JS_UNLOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 \
! 134: : js_UnlockScope(cx, scope))
1.1 root 135: #define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
136: js_TransferScopeLock(cx, scope, newscope)
137:
138: extern void js_LockRuntime(JSRuntime *rt);
139: extern void js_UnlockRuntime(JSRuntime *rt);
140: extern void js_LockObj(JSContext *cx, JSObject *obj);
141: extern void js_UnlockObj(JSContext *cx, JSObject *obj);
142: extern void js_LockScope(JSContext *cx, JSScope *scope);
143: extern void js_UnlockScope(JSContext *cx, JSScope *scope);
144: extern int js_SetupLocks(int,int);
145: extern void js_CleanupLocks();
146: extern void js_TransferScopeLock(JSContext *, JSScope *, JSScope *);
147: extern JS_FRIEND_API(jsval)
148: js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
149: extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
150: extern void js_InitLock(JSThinLock *);
151: extern void js_FinishLock(JSThinLock *);
152: extern void js_FinishSharingScope(JSRuntime *rt, JSScope *scope);
153:
154: #ifdef DEBUG
155:
156: #define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
157: #define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj)
158: #define JS_IS_SCOPE_LOCKED(cx,scope) js_IsScopeLocked(cx,scope)
159:
160: extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
161: extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj);
162: extern JSBool js_IsScopeLocked(JSContext *cx, JSScope *scope);
163:
164: #else
165:
166: #define JS_IS_RUNTIME_LOCKED(rt) 0
167: #define JS_IS_OBJ_LOCKED(cx,obj) 1
168: #define JS_IS_SCOPE_LOCKED(cx,scope) 1
169:
170: #endif /* DEBUG */
171:
172: #define JS_LOCK_OBJ_VOID(cx, obj, e) \
173: JS_BEGIN_MACRO \
174: JS_LOCK_OBJ(cx, obj); \
175: e; \
176: JS_UNLOCK_OBJ(cx, obj); \
177: JS_END_MACRO
178:
179: #define JS_LOCK_VOID(cx, e) \
180: JS_BEGIN_MACRO \
181: JSRuntime *_rt = (cx)->runtime; \
182: JS_LOCK_RUNTIME_VOID(_rt, e); \
183: JS_END_MACRO
184:
1.1.1.2 ! root 185: /* FIXME: bug 353962 hackaround */
! 186: #define JS_USE_ONLY_NSPR_LOCKS 1
! 187:
1.1 root 188: #if defined(JS_USE_ONLY_NSPR_LOCKS) || \
189: !( (defined(_WIN32) && defined(_M_IX86)) || \
190: (defined(__GNUC__) && defined(__i386__)) || \
1.1.1.2 ! root 191: ((defined(__USLC__) || defined(_SCO_DS)) && defined(i386)) || \
1.1 root 192: (defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \
193: defined(AIX) )
194:
195: #define NSPR_LOCK 1
196:
197: #undef JS_LOCK0
198: #undef JS_UNLOCK0
199: #define JS_LOCK0(P,M) (JS_ACQUIRE_LOCK(((JSLock*)(P)->fat)), (P)->owner = (M))
200: #define JS_UNLOCK0(P,M) ((P)->owner = 0, JS_RELEASE_LOCK(((JSLock*)(P)->fat)))
201:
202: #else /* arch-tests */
203:
204: #undef NSPR_LOCK
205:
206: extern JS_INLINE void js_Lock(JSThinLock *tl, jsword me);
207: extern JS_INLINE void js_Unlock(JSThinLock *tl, jsword me);
208:
209: #endif /* arch-tests */
210:
211: #else /* !JS_THREADSAFE */
212:
213: #define JS_ATOMIC_INCREMENT(p) (++*(p))
214: #define JS_ATOMIC_DECREMENT(p) (--*(p))
215: #define JS_ATOMIC_ADD(p,v) (*(p) += (v))
216:
217: #define JS_CurrentThreadId() 0
218: #define JS_NEW_LOCK() NULL
219: #define JS_DESTROY_LOCK(l) ((void)0)
220: #define JS_ACQUIRE_LOCK(l) ((void)0)
221: #define JS_RELEASE_LOCK(l) ((void)0)
222: #define JS_LOCK0(P,M) ((void)0)
223: #define JS_UNLOCK0(P,M) ((void)0)
224:
225: #define JS_NEW_CONDVAR(l) NULL
226: #define JS_DESTROY_CONDVAR(cv) ((void)0)
227: #define JS_WAIT_CONDVAR(cv,to) ((void)0)
228: #define JS_NOTIFY_CONDVAR(cv) ((void)0)
229: #define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
230:
231: #define JS_LOCK_RUNTIME(rt) ((void)0)
232: #define JS_UNLOCK_RUNTIME(rt) ((void)0)
233: #define JS_LOCK_OBJ(cx,obj) ((void)0)
234: #define JS_UNLOCK_OBJ(cx,obj) ((void)0)
235: #define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
236: #define JS_LOCK_SCOPE(cx,scope) ((void)0)
237: #define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
238: #define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
239:
240: #define JS_IS_RUNTIME_LOCKED(rt) 1
241: #define JS_IS_OBJ_LOCKED(cx,obj) 1
242: #define JS_IS_SCOPE_LOCKED(cx,scope) 1
243: #define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
244:
245: #endif /* !JS_THREADSAFE */
246:
247: #define JS_LOCK_RUNTIME_VOID(rt,e) \
248: JS_BEGIN_MACRO \
249: JS_LOCK_RUNTIME(rt); \
250: e; \
251: JS_UNLOCK_RUNTIME(rt); \
252: JS_END_MACRO
253:
254: #define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
255: #define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
256: #define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
257: #define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
258: #define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
259: #define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
260: JS_NO_TIMEOUT)
261: #define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
262:
1.1.1.2 ! root 263: #define JS_LOCK(P,CX) JS_LOCK0(P, CX_THINLOCK_ID(CX))
! 264: #define JS_UNLOCK(P,CX) JS_UNLOCK0(P, CX_THINLOCK_ID(CX))
1.1 root 265:
266: #endif /* jslock_h___ */
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