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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "GCActivityCallback.h"
     31 
     32 #include "APIShims.h"
     33 #include "Heap.h"
     34 #include "JSGlobalData.h"
     35 #include "JSLock.h"
     36 #include "JSObject.h"
     37 #include "ScopeChain.h"
     38 #include <wtf/RetainPtr.h>
     39 #include <wtf/WTFThreadData.h>
     40 
     41 #if !USE(CF)
     42 #error "This file should only be used on CF platforms."
     43 #endif
     44 
     45 namespace JSC {
     46 
     47 struct DefaultGCActivityCallbackPlatformData {
     48     static void trigger(CFRunLoopTimerRef, void *info);
     49 
     50     RetainPtr<CFRunLoopTimerRef> timer;
     51     RetainPtr<CFRunLoopRef> runLoop;
     52     CFRunLoopTimerContext context;
     53 };
     54 
     55 const CFTimeInterval decade = 60 * 60 * 24 * 365 * 10;
     56 const CFTimeInterval triggerInterval = 2; // seconds
     57 
     58 void DefaultGCActivityCallbackPlatformData::trigger(CFRunLoopTimerRef timer, void *info)
     59 {
     60     Heap* heap = static_cast<Heap*>(info);
     61     APIEntryShim shim(heap->globalData());
     62     heap->collectAllGarbage();
     63     CFRunLoopTimerSetNextFireDate(timer, CFAbsoluteTimeGetCurrent() + decade);
     64 }
     65 
     66 DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
     67 {
     68     commonConstructor(heap, CFRunLoopGetCurrent());
     69 }
     70 
     71 DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef runLoop)
     72 {
     73     commonConstructor(heap, runLoop);
     74 }
     75 
     76 DefaultGCActivityCallback::~DefaultGCActivityCallback()
     77 {
     78     CFRunLoopRemoveTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
     79     CFRunLoopTimerInvalidate(d->timer.get());
     80     d->context.info = 0;
     81     d->runLoop = 0;
     82     d->timer = 0;
     83 }
     84 
     85 void DefaultGCActivityCallback::commonConstructor(Heap* heap, CFRunLoopRef runLoop)
     86 {
     87     d = adoptPtr(new DefaultGCActivityCallbackPlatformData);
     88 
     89     memset(&d->context, 0, sizeof(CFRunLoopTimerContext));
     90     d->context.info = heap;
     91     d->runLoop = runLoop;
     92     d->timer.adoptCF(CFRunLoopTimerCreate(0, decade, decade, 0, 0, DefaultGCActivityCallbackPlatformData::trigger, &d->context));
     93     CFRunLoopAddTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
     94 }
     95 
     96 void DefaultGCActivityCallback::operator()()
     97 {
     98     CFRunLoopTimerSetNextFireDate(d->timer.get(), CFAbsoluteTimeGetCurrent() + triggerInterval);
     99 }
    100 
    101 void DefaultGCActivityCallback::synchronize()
    102 {
    103     if (CFRunLoopGetCurrent() == d->runLoop.get())
    104         return;
    105     CFRunLoopRemoveTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
    106     d->runLoop = CFRunLoopGetCurrent();
    107     CFRunLoopAddTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
    108 }
    109 
    110 }
    111