DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (5216dd412535)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or 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 the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#ifndef jslock_h__
#define jslock_h__

#include "jstypes.h"
#include "jsapi.h"
#include "jsprvtd.h"

#ifdef JS_THREADSAFE
# include "pratom.h"
# include "prlock.h"
# include "prcvar.h"
# include "prthread.h"
#endif

JS_BEGIN_EXTERN_C

#ifdef JS_THREADSAFE

#if (defined(_WIN32) && defined(_M_IX86)) ||                                  \
    (defined(_WIN64) && (defined(_M_AMD64) || defined(_M_X64))) ||            \
    (defined(__i386) && (defined(__GNUC__) || defined(__SUNPRO_CC))) ||       \
    (defined(__x86_64) && (defined(__GNUC__) || defined(__SUNPRO_CC))) ||     \
    (defined(__sparc) && (defined(__GNUC__) || defined(__SUNPRO_CC))) ||      \
    defined(AIX) ||                                                           \
    defined(USE_ARM_KUSER)
# define JS_HAS_NATIVE_COMPARE_AND_SWAP 1
#else
# define JS_HAS_NATIVE_COMPARE_AND_SWAP 0
#endif

#if defined(JS_USE_ONLY_NSPR_LOCKS) || !JS_HAS_NATIVE_COMPARE_AND_SWAP
# define NSPR_LOCK 1
#else
# undef NSPR_LOCK
#endif

#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;

typedef struct JSThinLock {
    jsword      owner;
    JSFatLock   *fat;
} JSThinLock;

#define CX_THINLOCK_ID(cx)       ((jsword)(cx)->thread)
#define CURRENT_THREAD_IS_ME(me) (((JSThread *)me)->id == js_CurrentThreadId())

typedef PRLock JSLock;

/*
 * 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 JS_ATOMIC_ADD(p,v)          PR_AtomicAdd((PRInt32 *)(p), (PRInt32)(v))
#define JS_ATOMIC_SET(p,v)          PR_AtomicSet((PRInt32 *)(p), (PRInt32)(v))

#define js_CurrentThreadId()        PR_GetCurrentThread()
#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_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)

#define JS_LOCK(cx, tl)             js_Lock(cx, tl)
#define JS_UNLOCK(cx, tl)           js_Unlock(cx, tl)

#define JS_LOCK_RUNTIME(rt)         js_LockRuntime(rt)
#define JS_UNLOCK_RUNTIME(rt)       js_UnlockRuntime(rt)

extern void js_Lock(JSContext *cx, JSThinLock *tl);
extern void js_Unlock(JSContext *cx, JSThinLock *tl);
extern void js_LockRuntime(JSRuntime *rt);
extern void js_UnlockRuntime(JSRuntime *rt);
extern int js_SetupLocks(int,int);
extern void js_CleanupLocks();
extern void js_InitLock(JSThinLock *);
extern void js_FinishLock(JSThinLock *);

#ifdef DEBUG

#define JS_IS_RUNTIME_LOCKED(rt)        js_IsRuntimeLocked(rt)

extern JSBool js_IsRuntimeLocked(JSRuntime *rt);

#else

#define JS_IS_RUNTIME_LOCKED(rt)        0

#endif /* DEBUG */

#else  /* !JS_THREADSAFE */

#define JS_ATOMIC_INCREMENT(p)      (++*(p))
#define JS_ATOMIC_DECREMENT(p)      (--*(p))
#define JS_ATOMIC_ADD(p,v)          (*(p) += (v))
#define JS_ATOMIC_SET(p,v)          (*(p) = (v))

#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_LOCK(cx, tl)             ((void)0)
#define JS_UNLOCK(cx, tl)           ((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_IS_RUNTIME_LOCKED(rt)        1

#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_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)

#ifndef JS_SET_OBJ_INFO
#define JS_SET_OBJ_INFO(obj,f,l)        ((void)0)
#endif
#ifndef JS_SET_TITLE_INFO
#define JS_SET_TITLE_INFO(title,f,l)    ((void)0)
#endif

#ifdef JS_THREADSAFE

extern JSBool
js_CompareAndSwap(volatile jsword *w, jsword ov, jsword nv);

/* Atomically bitwise-or the mask into the word *w using compare and swap. */
extern void
js_AtomicSetMask(volatile jsword *w, jsword mask);

/*
 * Atomically bitwise-and the complement of the mask into the word *w using
 * compare and swap.
 */
extern void
js_AtomicClearMask(volatile jsword *w, jsword mask);

#define JS_ATOMIC_SET_MASK(w, mask) js_AtomicSetMask(w, mask)
#define JS_ATOMIC_CLEAR_MASK(w, mask) js_AtomicClearMask(w, mask)

#else

static inline JSBool
js_CompareAndSwap(jsword *w, jsword ov, jsword nv)
{
    return (*w == ov) ? *w = nv, JS_TRUE : JS_FALSE;
}

#define JS_ATOMIC_SET_MASK(w, mask) (*(w) |= (mask))
#define JS_ATOMIC_CLEAR_MASK(w, mask) (*(w) &= ~(mask))

#endif /* JS_THREADSAFE */

JS_END_EXTERN_C

#if defined JS_THREADSAFE && defined __cplusplus
namespace js {

class AutoLock {
  private:
    JSLock *lock;

  public:
    AutoLock(JSLock *lock) : lock(lock) { JS_ACQUIRE_LOCK(lock); }
    ~AutoLock() { JS_RELEASE_LOCK(lock); }
};

}
#endif

#endif /* jslock_h___ */