| 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 |
#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(_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 |
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 |
* Title structure is always allocated as a field of JSScope. |
| 108 |
*/ |
| 109 |
#define TITLE_TO_SCOPE(title) \ |
| 110 |
((JSScope *)((uint8 *) (title) - offsetof(JSScope, title))) |
| 111 |
|
| 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 |
#define JS_ATOMIC_SET(p,v) PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v)) |
| 120 |
|
| 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 |
#define JS_SET_OBJ_INFO(obj_, file_, line_) \ |
| 137 |
JS_SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_) |
| 138 |
|
| 139 |
#define JS_SET_SCOPE_INFO(scope_, file_, line_) \ |
| 140 |
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 |
#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 |
? (void)0 : js_UnlockObj(cx, obj)) |
| 163 |
|
| 164 |
/* |
| 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 |
#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 |
|
| 179 |
#define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \ |
| 180 |
: 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 |
#define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \ |
| 186 |
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 |
#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 |
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 |
/* |
| 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 |
#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 |
#define JS_ATOMIC_SET(p,v) (*(p) = (v)) |
| 249 |
|
| 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 |
#define JS_LOCK_OBJ_IF_SHAPE(cx,obj,shape) (OBJ_SHAPE(obj) == (shape)) |
| 269 |
|
| 270 |
#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 |
#ifndef JS_SET_OBJ_INFO |
| 297 |
#define JS_SET_OBJ_INFO(obj,f,l) ((void)0) |
| 298 |
#endif |
| 299 |
#ifndef JS_SET_TITLE_INFO |
| 300 |
#define JS_SET_TITLE_INFO(title,f,l) ((void)0) |
| 301 |
#endif |
| 302 |
|
| 303 |
#ifdef JS_THREADSAFE |
| 304 |
|
| 305 |
extern JSBool |
| 306 |
js_CompareAndSwap(jsword *w, jsword ov, jsword nv); |
| 307 |
|
| 308 |
/* 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 |
#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 |
#define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask)) |
| 323 |
|
| 324 |
#endif /* JS_THREADSAFE */ |
| 325 |
|
| 326 |
JS_END_EXTERN_C |
| 327 |
|
| 328 |
#endif /* jslock_h___ */ |
Parent Directory
| 
Revision Log