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gecko-dev/js/src/jslock.h

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C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
#ifndef jslock_h__
#define jslock_h__
#ifdef JS_THREADSAFE
#include "jstypes.h"
#include "pratom.h"
#include "prlock.h"
#include "prcvar.h"
#include "jshash.h" /* Added by JSIFY */
#include "jsprvtd.h" /* for JSScope, etc. */
#include "jspubtd.h" /* for JSRuntime, etc. */
#define Thin_GetWait(W) ((jsword)(W) & 0x1)
#define Thin_SetWait(W) ((jsword)(W) | 0x1)
#define Thin_RemoveWait(W) ((jsword)(W) & ~0x1)
typedef struct JSFatLock JSFatLock;
struct JSFatLock {
int susp;
PRLock *slock;
PRCondVar *svar;
JSFatLock *next;
JSFatLock **prevp;
};
typedef struct JSThinLock {
jsword owner;
JSFatLock *fat;
} JSThinLock;
typedef PRLock JSLock;
typedef struct JSFatLockTable {
JSFatLock *free;
JSFatLock *taken;
} JSFatLockTable;
/*
* Atomic increment and decrement for a reference counter, given jsrefcount *p.
* NB: jsrefcount is int32, aka PRInt32, so that pratom.h functions work.
*/
#define JS_ATOMIC_INCREMENT(p) PR_AtomicIncrement((PRInt32 *)(p))
#define JS_ATOMIC_DECREMENT(p) PR_AtomicDecrement((PRInt32 *)(p))
#define CurrentThreadId() (jsword)PR_GetCurrentThread()
#define JS_CurrentThreadId() js_CurrentThreadId()
#define JS_NEW_LOCK() PR_NewLock()
#define JS_DESTROY_LOCK(l) PR_DestroyLock(l)
#define JS_ACQUIRE_LOCK(l) PR_Lock(l)
#define JS_RELEASE_LOCK(l) PR_Unlock(l)
#define JS_LOCK0(P,M) js_Lock(P,M)
#define JS_UNLOCK0(P,M) js_Unlock(P,M)
#define JS_NEW_CONDVAR(l) PR_NewCondVar(l)
#define JS_DESTROY_CONDVAR(cv) PR_DestroyCondVar(cv)
#define JS_WAIT_CONDVAR(cv,to) PR_WaitCondVar(cv,to)
#define JS_NO_TIMEOUT PR_INTERVAL_NO_TIMEOUT
#define JS_NOTIFY_CONDVAR(cv) PR_NotifyCondVar(cv)
#define JS_NOTIFY_ALL_CONDVAR(cv) PR_NotifyAllCondVar(cv)
/*
* Include jsscope.h so JS_LOCK_OBJ macro callers don't have to include it.
* Since there is a JSThinLock member in JSScope, we can't nest this include
* much earlier (see JSThinLock's typedef, above). Yes, that means there is
* an #include cycle between jslock.h and jsscope.h: moderate-sized XXX here,
* to be fixed by moving JS_LOCK_SCOPE to jsscope.h, JS_LOCK_OBJ to jsobj.h,
* and so on.
*
* We also need jsscope.h #ifdef DEBUG for SET_OBJ_INFO and SET_SCOPE_INFO,
* but we do not want any nested includes that depend on DEBUG. Those lead
* to build bustage when someone makes a change that depends in a subtle way
* on jsscope.h being included directly or indirectly, but does not test by
* building optimized as well as DEBUG.
*/
#include "jsscope.h"
#ifdef DEBUG
#define SET_OBJ_INFO(obj_,file_,line_) \
SET_SCOPE_INFO(OBJ_SCOPE(obj_),file_,line_)
#define SET_SCOPE_INFO(scope_,file_,line_) \
((scope_)->ownercx ? (void)0 : \
(JS_ASSERT((scope_)->u.count > 0 && (scope_)->u.count <= 4), \
(void)((scope_)->file[(scope_)->u.count-1] = (file_), \
(scope_)->line[(scope_)->u.count-1] = (line_))))
#endif /* DEBUG */
#define JS_LOCK_RUNTIME(rt) js_LockRuntime(rt)
#define JS_UNLOCK_RUNTIME(rt) js_UnlockRuntime(rt)
/*
* NB: The JS_LOCK_OBJ and JS_UNLOCK_OBJ macros work *only* on native objects
* (objects for which OBJ_IS_NATIVE returns true). All uses of these macros in
* the engine are predicated on OBJ_IS_NATIVE or equivalent checks. These uses
* are for optimizations above the JSObjectOps layer, under which object locks
* normally hide.
*/
#define JS_LOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
? (void)0 \
: (js_LockObj(cx, obj), \
SET_OBJ_INFO(obj,__FILE__,__LINE__)))
#define JS_UNLOCK_OBJ(cx,obj) ((OBJ_SCOPE(obj)->ownercx == (cx)) \
? (void)0 : js_UnlockObj(cx, obj))
#define JS_LOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 : \
(js_LockScope(cx, scope), \
SET_SCOPE_INFO(scope,__FILE__,__LINE__)))
#define JS_UNLOCK_SCOPE(cx,scope) ((scope)->ownercx == (cx) ? (void)0 : \
js_UnlockScope(cx, scope))
#define JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope) \
js_TransferScopeLock(cx, scope, newscope)
extern jsword js_CurrentThreadId();
extern void js_LockRuntime(JSRuntime *rt);
extern void js_UnlockRuntime(JSRuntime *rt);
extern void js_LockObj(JSContext *cx, JSObject *obj);
extern void js_UnlockObj(JSContext *cx, JSObject *obj);
extern void js_LockScope(JSContext *cx, JSScope *scope);
extern void js_UnlockScope(JSContext *cx, JSScope *scope);
extern int js_SetupLocks(int,int);
extern void js_CleanupLocks();
extern void js_InitContextForLocking(JSContext *);
extern void js_TransferScopeLock(JSContext *, JSScope *, JSScope *);
extern JS_FRIEND_API(jsval)
js_GetSlotThreadSafe(JSContext *, JSObject *, uint32);
extern void js_SetSlotThreadSafe(JSContext *, JSObject *, uint32, jsval);
extern void js_InitLock(JSThinLock *);
extern void js_FinishLock(JSThinLock *);
#ifdef DEBUG
#define JS_IS_RUNTIME_LOCKED(rt) js_IsRuntimeLocked(rt)
#define JS_IS_OBJ_LOCKED(obj) js_IsObjLocked(obj)
#define JS_IS_SCOPE_LOCKED(scope) js_IsScopeLocked(scope)
extern JSBool js_IsRuntimeLocked(JSRuntime *rt);
extern JSBool js_IsObjLocked(JSObject *obj);
extern JSBool js_IsScopeLocked(JSScope *scope);
#else
#define JS_IS_RUNTIME_LOCKED(rt) 0
#define JS_IS_OBJ_LOCKED(obj) 1
#define JS_IS_SCOPE_LOCKED(scope) 1
#endif /* DEBUG */
#define JS_LOCK_OBJ_VOID(cx, obj, e) \
JS_BEGIN_MACRO \
JS_LOCK_OBJ(cx, obj); \
e; \
JS_UNLOCK_OBJ(cx, obj); \
JS_END_MACRO
#define JS_LOCK_VOID(cx, e) \
JS_BEGIN_MACRO \
JSRuntime *_rt = (cx)->runtime; \
JS_LOCK_RUNTIME_VOID(_rt, e); \
JS_END_MACRO
#if defined(JS_USE_ONLY_NSPR_LOCKS) || \
!( (defined(_WIN32) && defined(_M_IX86)) || \
(defined(__GNUC__) && defined(__i386__)) || \
(defined(SOLARIS) && defined(sparc) && defined(ULTRA_SPARC)) || \
defined(AIX) )
#define NSPR_LOCK 1
#undef JS_LOCK0
#undef JS_UNLOCK0
#define JS_LOCK0(P,M) (JS_ACQUIRE_LOCK(((JSLock*)(P)->fat)), (P)->owner = (M))
#define JS_UNLOCK0(P,M) ((P)->owner = 0, JS_RELEASE_LOCK(((JSLock*)(P)->fat)))
#else /* arch-tests */
#undef NSPR_LOCK
extern JS_INLINE void js_Lock(JSThinLock *tl, jsword me);
extern JS_INLINE void js_Unlock(JSThinLock *tl, jsword me);
#endif /* arch-tests */
#else /* !JS_THREADSAFE */
#define JS_ATOMIC_INCREMENT(p) (++*(p))
#define JS_ATOMIC_DECREMENT(p) (--*(p))
#define JS_CurrentThreadId() 0
#define JS_NEW_LOCK() NULL
#define JS_DESTROY_LOCK(l) ((void)0)
#define JS_ACQUIRE_LOCK(l) ((void)0)
#define JS_RELEASE_LOCK(l) ((void)0)
#define JS_LOCK0(P,M) ((void)0)
#define JS_UNLOCK0(P,M) ((void)0)
#define JS_NEW_CONDVAR(l) NULL
#define JS_DESTROY_CONDVAR(cv) ((void)0)
#define JS_WAIT_CONDVAR(cv,to) ((void)0)
#define JS_NOTIFY_CONDVAR(cv) ((void)0)
#define JS_NOTIFY_ALL_CONDVAR(cv) ((void)0)
#define JS_LOCK_RUNTIME(rt) ((void)0)
#define JS_UNLOCK_RUNTIME(rt) ((void)0)
#define JS_LOCK_OBJ(cx,obj) ((void)0)
#define JS_UNLOCK_OBJ(cx,obj) ((void)0)
#define JS_LOCK_OBJ_VOID(cx,obj,e) (e)
#define JS_LOCK_SCOPE(cx,scope) ((void)0)
#define JS_UNLOCK_SCOPE(cx,scope) ((void)0)
#define JS_TRANSFER_SCOPE_LOCK(c,o,n) ((void)0)
#define JS_IS_RUNTIME_LOCKED(rt) 1
#define JS_IS_OBJ_LOCKED(obj) 1
#define JS_IS_SCOPE_LOCKED(scope) 1
#define JS_LOCK_VOID(cx, e) JS_LOCK_RUNTIME_VOID((cx)->runtime, e)
#endif /* !JS_THREADSAFE */
#define JS_LOCK_RUNTIME_VOID(rt,e) \
JS_BEGIN_MACRO \
JS_LOCK_RUNTIME(rt); \
e; \
JS_UNLOCK_RUNTIME(rt); \
JS_END_MACRO
#define JS_LOCK_GC(rt) JS_ACQUIRE_LOCK((rt)->gcLock)
#define JS_UNLOCK_GC(rt) JS_RELEASE_LOCK((rt)->gcLock)
#define JS_LOCK_GC_VOID(rt,e) (JS_LOCK_GC(rt), (e), JS_UNLOCK_GC(rt))
#define JS_AWAIT_GC_DONE(rt) JS_WAIT_CONDVAR((rt)->gcDone, JS_NO_TIMEOUT)
#define JS_NOTIFY_GC_DONE(rt) JS_NOTIFY_ALL_CONDVAR((rt)->gcDone)
#define JS_AWAIT_REQUEST_DONE(rt) JS_WAIT_CONDVAR((rt)->requestDone, \
JS_NO_TIMEOUT)
#define JS_NOTIFY_REQUEST_DONE(rt) JS_NOTIFY_CONDVAR((rt)->requestDone)
#define JS_LOCK(P,CX) JS_LOCK0(P,(CX)->thread)
#define JS_UNLOCK(P,CX) JS_UNLOCK0(P,(CX)->thread)
#ifndef SET_OBJ_INFO
#define SET_OBJ_INFO(obj,f,l) ((void)0)
#endif
#ifndef SET_SCOPE_INFO
#define SET_SCOPE_INFO(scope,f,l) ((void)0)
#endif
#endif /* jslock_h___ */
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