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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
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* |
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* ***** BEGIN LICENSE BLOCK ***** |
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
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* |
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* The contents of this file are subject to the Mozilla Public License Version |
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* 1.1 (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* http://www.mozilla.org/MPL/ |
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* |
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* Software distributed under the License is distributed on an "AS IS" basis, |
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
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* for the specific language governing rights and limitations under the |
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* License. |
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* |
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* The Original Code is Mozilla Communicator client code, released |
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* March 31, 1998. |
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* |
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* The Initial Developer of the Original Code is |
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* Netscape Communications Corporation. |
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* Portions created by the Initial Developer are Copyright (C) 1998 |
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* the Initial Developer. All Rights Reserved. |
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* |
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* Contributor(s): |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* either of the GNU General Public License Version 2 or later (the "GPL"), |
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
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* in which case the provisions of the GPL or the LGPL are applicable instead |
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* of those above. If you wish to allow use of your version of this file only |
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* under the terms of either the GPL or the LGPL, and not to allow others to |
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* use your version of this file under the terms of the MPL, indicate your |
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* decision by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL or the LGPL. If you do not delete |
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* the provisions above, a recipient may use your version of this file under |
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* the terms of any one of the MPL, the GPL or the LGPL. |
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* |
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* ***** END LICENSE BLOCK ***** */ |
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#ifndef jslock_h__ |
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#define jslock_h__ |
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|
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#include "jstypes.h" |
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#include "jsprvtd.h" /* for JSScope, etc. */ |
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#include "jspubtd.h" /* for JSRuntime, etc. */ |
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|
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#ifdef JS_THREADSAFE |
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# include "pratom.h" |
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# include "prlock.h" |
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# include "prcvar.h" |
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# include "prthread.h" |
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#endif |
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|
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JS_BEGIN_EXTERN_C |
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|
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#ifdef JS_THREADSAFE |
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|
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#if (defined(_WIN32) && defined(_M_IX86)) || \ |
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(defined(__GNUC__) && defined(__i386__)) || \ |
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(defined(__GNUC__) && defined(__x86_64__)) || \ |
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(defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \ |
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defined(AIX) || \ |
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defined(USE_ARM_KUSER) |
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# define JS_HAS_NATIVE_COMPARE_AND_SWAP 1 |
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#else |
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# define JS_HAS_NATIVE_COMPARE_AND_SWAP 0 |
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#endif |
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|
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#if defined(JS_USE_ONLY_NSPR_LOCKS) || !JS_HAS_NATIVE_COMPARE_AND_SWAP |
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# define NSPR_LOCK 1 |
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#else |
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# undef NSPR_LOCK |
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#endif |
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|
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#define Thin_GetWait(W) ((jsword)(W) & 0x1) |
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#define Thin_SetWait(W) ((jsword)(W) | 0x1) |
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#define Thin_RemoveWait(W) ((jsword)(W) & ~0x1) |
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|
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typedef struct JSFatLock JSFatLock; |
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|
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typedef struct JSThinLock { |
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jsword owner; |
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JSFatLock *fat; |
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} JSThinLock; |
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|
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#define CX_THINLOCK_ID(cx) ((jsword)(cx)->thread) |
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#define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId()) |
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|
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typedef PRLock JSLock; |
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|
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typedef struct JSTitle JSTitle; |
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|
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struct JSTitle { |
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JSContext *ownercx; /* creating context, NULL if shared */ |
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JSThinLock lock; /* binary semaphore protecting title */ |
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union { /* union lockful and lock-free state: */ |
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jsrefcount count; /* lock entry count for reentrancy */ |
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JSTitle *link; /* next link in rt->titleSharingTodo */ |
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} u; |
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#ifdef JS_DEBUG_TITLE_LOCKS |
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const char *file[4]; /* file where lock was (re-)taken */ |
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unsigned int line[4]; /* line where lock was (re-)taken */ |
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#endif |
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}; |
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|
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/* |
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* Title structure is always allocated as a field of JSScope. |
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*/ |
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#define TITLE_TO_SCOPE(title) \ |
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((JSScope *)((uint8 *) (title) - offsetof(JSScope, title))) |
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|
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/* |
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* Atomic increment and decrement for a reference counter, given jsrefcount *p. |
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* NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work. |
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*/ |
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#define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p)) |
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#define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p)) |
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#define JS_ATOMIC_ADD(p,v) PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v)) |
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#define JS_ATOMIC_SET(p,v) PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v)) |
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|
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#define js_CurrentThreadId() (jsword)PR_GetCurrentThread() |
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#define JS_NEW_LOCK() PR_NewLock() |
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#define JS_DESTROY_LOCK(l) PR_DestroyLock(l) |
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#define JS_ACQUIRE_LOCK(l) PR_Lock(l) |
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#define JS_RELEASE_LOCK(l) PR_Unlock(l) |
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|
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#define JS_NEW_CONDVAR(l) PR_NewCondVar(l) |
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#define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv) |
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#define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to) |
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#define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT |
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#define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv) |
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#define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv) |
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|
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#ifdef JS_DEBUG_TITLE_LOCKS |
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|
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#define JS_SET_OBJ_INFO(obj_, file_, line_) \ |
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JS_SET_SCOPE_INFO(OBJ_SCOPE(obj_), file_, line_) |
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|
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#define JS_SET_SCOPE_INFO(scope_, file_, line_) \ |
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js_SetScopeInfo(scope_, file_, line_) |
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|
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#endif |
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|
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#define JS_LOCK(cx, tl) js_Lock(cx, tl) |
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#define JS_UNLOCK(cx, tl) js_Unlock(cx, tl) |
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|
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#define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt) |
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#define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt) |
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|
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/* |
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* NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects |
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* (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in |
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* the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses |
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* are for optimizations above the JSObjectOps layer, under which object locks |
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* normally hide. |
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*/ |
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#define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \ |
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? (void)0 \ |
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: (js_LockObj(cx, obj), \ |
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JS_SET_OBJ_INFO(obj,__FILE__,__LINE__))) |
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#define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->title.ownercx == (cx)) \ |
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? (void)0 : js_UnlockObj(cx, obj)) |
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|
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#define JS_LOCK_TITLE(cx,title) \ |
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((title)->ownercx == (cx) ? (void)0 \ |
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: (js_LockTitle(cx, (title)), \ |
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JS_SET_TITLE_INFO(title,__FILE__,__LINE__))) |
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|
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#define JS_UNLOCK_TITLE(cx,title) ((title)->ownercx == (cx) ? (void)0 \ |
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: js_UnlockTitle(cx, title)) |
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|
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#define JS_LOCK_SCOPE(cx,scope) JS_LOCK_TITLE(cx,&(scope)->title) |
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#define JS_UNLOCK_SCOPE(cx,scope) JS_UNLOCK_TITLE(cx,&(scope)->title) |
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|
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#define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \ |
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js_TransferTitle(cx, &scope->title, &newscope->title) |
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|
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|
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extern void js_Lock(JSContext *cx, JSThinLock *tl); |
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extern void js_Unlock(JSContext *cx, JSThinLock *tl); |
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extern void js_LockRuntime(JSRuntime *rt); |
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extern void js_UnlockRuntime(JSRuntime *rt); |
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extern void js_LockObj(JSContext *cx, JSObject *obj); |
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extern void js_UnlockObj(JSContext *cx, JSObject *obj); |
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extern void js_InitTitle(JSContext *cx, JSTitle *title); |
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extern void js_FinishTitle(JSContext *cx, JSTitle *title); |
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extern void js_LockTitle(JSContext *cx, JSTitle *title); |
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extern void js_UnlockTitle(JSContext *cx, JSTitle *title); |
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extern int js_SetupLocks(int,int); |
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extern void js_CleanupLocks(); |
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extern void js_TransferTitle(JSContext *, JSTitle *, JSTitle *); |
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extern JS_FRIEND_API(jsval) |
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js_GetSlotThreadSafe(JSContext *, JSObject *, uint32); |
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extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval); |
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extern void js_InitLock(JSThinLock *); |
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extern void js_FinishLock(JSThinLock *); |
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|
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/* |
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* This function must be called with the GC lock held. |
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*/ |
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extern void |
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js_ShareWaitingTitles(JSContext *cx); |
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|
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extern void |
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js_NudgeOtherContexts(JSContext *cx); |
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|
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#ifdef DEBUG |
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|
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#define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt) |
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#define JS_IS_OBJ_LOCKED(cx,obj) js_IsObjLocked(cx,obj) |
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#define JS_IS_TITLE_LOCKED(cx,title) js_IsTitleLocked(cx,title) |
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|
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extern JSBool js_IsRuntimeLocked(JSRuntime *rt); |
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extern JSBool js_IsObjLocked(JSContext *cx, JSObject *obj); |
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extern JSBool js_IsTitleLocked(JSContext *cx, JSTitle *title); |
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#ifdef JS_DEBUG_TITLE_LOCKS |
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extern void js_SetScopeInfo(JSScope *scope, const char *file, int line); |
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#endif |
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|
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#else |
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|
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#define JS_IS_RUNTIME_LOCKED(rt) 0 |
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#define JS_IS_OBJ_LOCKED(cx,obj) 1 |
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#define JS_IS_TITLE_LOCKED(cx,title) 1 |
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|
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#endif /* DEBUG */ |
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|
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#define JS_LOCK_OBJ_VOID(cx, obj, e) \ |
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JS_BEGIN_MACRO \ |
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JS_LOCK_OBJ(cx, obj); \ |
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e; \ |
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JS_UNLOCK_OBJ(cx, obj); \ |
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JS_END_MACRO |
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|
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#define JS_LOCK_VOID(cx, e) \ |
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JS_BEGIN_MACRO \ |
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JSRuntime *_rt = (cx)->runtime; \ |
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JS_LOCK_RUNTIME_VOID(_rt, e); \ |
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JS_END_MACRO |
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|
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#else /* !JS_THREADSAFE */ |
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|
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#define JS_ATOMIC_INCREMENT(p) (++*(p)) |
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#define JS_ATOMIC_DECREMENT(p) (--*(p)) |
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#define JS_ATOMIC_ADD(p,v) (*(p) += (v)) |
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#define JS_ATOMIC_SET(p,v) (*(p) = (v)) |
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|
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#define JS_CurrentThreadId() 0 |
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#define JS_NEW_LOCK() NULL |
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#define JS_DESTROY_LOCK(l) ((void)0) |
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#define JS_ACQUIRE_LOCK(l) ((void)0) |
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#define JS_RELEASE_LOCK(l) ((void)0) |
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#define JS_LOCK(cx, tl) ((void)0) |
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#define JS_UNLOCK(cx, tl) ((void)0) |
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|
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#define JS_NEW_CONDVAR(l) NULL |
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#define JS_DESTROY_CONDVAR(cv) ((void)0) |
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#define JS_WAIT_CONDVAR(cv,to) ((void)0) |
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#define JS_NOTIFY_CONDVAR(cv) ((void)0) |
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#define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0) |
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|
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#define JS_LOCK_RUNTIME(rt) ((void)0) |
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#define JS_UNLOCK_RUNTIME(rt) ((void)0) |
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#define JS_LOCK_OBJ(cx,obj) ((void)0) |
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#define JS_UNLOCK_OBJ(cx,obj) ((void)0) |
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#define JS_LOCK_OBJ_VOID(cx,obj,e) (e) |
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#define JS_LOCK_SCOPE(cx,scope) ((void)0) |
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#define JS_UNLOCK_SCOPE(cx,scope) ((void)0) |
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#define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0) |
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|
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#define JS_IS_RUNTIME_LOCKED(rt) 1 |
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#define JS_IS_OBJ_LOCKED(cx,obj) 1 |
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#define JS_IS_TITLE_LOCKED(cx,title) 1 |
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#define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e) |
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|
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#endif /* !JS_THREADSAFE */ |
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|
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#define JS_LOCK_RUNTIME_VOID(rt,e) \ |
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JS_BEGIN_MACRO \ |
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JS_LOCK_RUNTIME(rt); \ |
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e; \ |
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JS_UNLOCK_RUNTIME(rt); \ |
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JS_END_MACRO |
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|
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#define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock) |
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#define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock) |
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#define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt)) |
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#define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT) |
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#define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone) |
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#define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \ |
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JS_NO_TIMEOUT) |
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#define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone) |
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|
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#ifndef JS_SET_OBJ_INFO |
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#define JS_SET_OBJ_INFO(obj,f,l) ((void)0) |
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#endif |
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#ifndef JS_SET_TITLE_INFO |
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#define JS_SET_TITLE_INFO(title,f,l) ((void)0) |
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#endif |
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|
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#ifdef JS_THREADSAFE |
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|
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extern JSBool |
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js_CompareAndSwap(jsword *w, jsword ov, jsword nv); |
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|
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/* Atomically bitwise-or the mask into the word *w using compare and swap. */ |
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extern void |
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js_AtomicSetMask(jsword *w, jsword mask); |
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|
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#define JS_ATOMIC_SET_MASK(w, mask) js_AtomicSetMask(w, mask) |
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|
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#else |
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|
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static inline JSBool |
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js_CompareAndSwap(jsword *w, jsword ov, jsword nv) |
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{ |
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return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE; |
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} |
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|
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#define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask)) |
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|
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#endif /* JS_THREADSAFE */ |
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|
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JS_END_EXTERN_C |
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|
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#endif /* jslock_h___ */ |
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