+++ /dev/null
-/*
- * Copyright (C) 2010 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- * its contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "GCActivityCallback.h"
-
-#include "APIShims.h"
-#include "Heap.h"
-#include "JSGlobalData.h"
-#include "JSLock.h"
-#include "JSObject.h"
-#include "ScopeChain.h"
-#include <wtf/RetainPtr.h>
-#include <wtf/WTFThreadData.h>
-
-#if !USE(CF)
-#error "This file should only be used on CF platforms."
-#endif
-
-namespace JSC {
-
-bool GCActivityCallback::s_shouldCreateGCTimer = true;
-
-struct DefaultGCActivityCallbackPlatformData {
- static void timerDidFire(CFRunLoopTimerRef, void *info);
-
- RetainPtr<CFRunLoopTimerRef> timer;
- RetainPtr<CFRunLoopRef> runLoop;
- CFRunLoopTimerContext context;
- double delay;
- DefaultGCActivityCallback* thisObject;
- JSGlobalData* globalData;
- Mutex shutdownMutex;
-};
-
-const double gcTimeSlicePerMB = 0.01; // Percentage of CPU time we will spend to reclaim 1 MB
-const double maxGCTimeSlice = 0.05; // The maximum amount of CPU time we want to use for opportunistic timer-triggered collections.
-const double timerSlop = 2.0; // Fudge factor to avoid performance cost of resetting timer.
-const double pagingTimeOut = 0.1; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out.
-const CFTimeInterval decade = 60 * 60 * 24 * 365 * 10;
-const CFTimeInterval hour = 60 * 60;
-
-void DefaultGCActivityCallbackPlatformData::timerDidFire(CFRunLoopTimerRef, void *info)
-{
- DefaultGCActivityCallbackPlatformData* d = static_cast<DefaultGCActivityCallbackPlatformData*>(info);
- d->shutdownMutex.lock();
- if (!d->globalData) {
- d->shutdownMutex.unlock();
- delete d->thisObject;
- return;
- }
- {
- // We don't ref here to prevent us from resurrecting the ref count of a "dead" JSGlobalData.
- APIEntryShim shim(d->globalData, APIEntryShimWithoutLock::DontRefGlobalData);
-
- Heap* heap = &d->globalData->heap;
- heap->collectAllGarbage();
- }
- d->shutdownMutex.unlock();
-}
-
-DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap)
-{
- commonConstructor(heap, CFRunLoopGetCurrent());
-}
-
-DefaultGCActivityCallback::DefaultGCActivityCallback(Heap* heap, CFRunLoopRef runLoop)
-{
- commonConstructor(heap, runLoop);
-}
-
-DefaultGCActivityCallback::~DefaultGCActivityCallback()
-{
- CFRunLoopRemoveTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
- CFRunLoopTimerInvalidate(d->timer.get());
-}
-
-void DefaultGCActivityCallback::commonConstructor(Heap* heap, CFRunLoopRef runLoop)
-{
- d = adoptPtr(new DefaultGCActivityCallbackPlatformData);
-
- memset(&d->context, 0, sizeof(CFRunLoopTimerContext));
- d->context.info = d.get();
- d->thisObject = this;
- d->globalData = heap->globalData();
- d->runLoop = runLoop;
- d->timer.adoptCF(CFRunLoopTimerCreate(0, decade, decade, 0, 0, DefaultGCActivityCallbackPlatformData::timerDidFire, &d->context));
- d->delay = decade;
- CFRunLoopAddTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
-}
-
-void DefaultGCActivityCallback::invalidate()
-{
- d->globalData = 0;
- // We set the next fire date in the distant past to cause the timer to immediately fire so that
- // the timer on the remote thread realizes that the VM is shutting down.
- CFRunLoopTimerSetNextFireDate(d->timer.get(), CFAbsoluteTimeGetCurrent() - decade);
-}
-
-void DefaultGCActivityCallback::didStartVMShutdown()
-{
- if (CFRunLoopGetCurrent() == d->runLoop.get()) {
- invalidate();
- delete this;
- return;
- }
- ASSERT(!d->globalData->apiLock().currentThreadIsHoldingLock());
- MutexLocker locker(d->shutdownMutex);
- invalidate();
-}
-
-static void scheduleTimer(DefaultGCActivityCallbackPlatformData* d, double newDelay)
-{
- if (newDelay * timerSlop > d->delay)
- return;
- double delta = d->delay - newDelay;
- d->delay = newDelay;
- CFRunLoopTimerSetNextFireDate(d->timer.get(), CFRunLoopTimerGetNextFireDate(d->timer.get()) - delta);
-}
-
-static void cancelTimer(DefaultGCActivityCallbackPlatformData* d)
-{
- d->delay = decade;
- CFRunLoopTimerSetNextFireDate(d->timer.get(), CFAbsoluteTimeGetCurrent() + decade);
-}
-
-void DefaultGCActivityCallback::didAllocate(size_t bytes)
-{
- // The first byte allocated in an allocation cycle will report 0 bytes to didAllocate.
- // We pretend it's one byte so that we don't ignore this allocation entirely.
- if (!bytes)
- bytes = 1;
- Heap* heap = &static_cast<DefaultGCActivityCallbackPlatformData*>(d->context.info)->globalData->heap;
- double gcTimeSlice = std::min((static_cast<double>(bytes) / MB) * gcTimeSlicePerMB, maxGCTimeSlice);
- double newDelay = heap->lastGCLength() / gcTimeSlice;
- scheduleTimer(d.get(), newDelay);
-}
-
-void DefaultGCActivityCallback::willCollect()
-{
- cancelTimer(d.get());
-}
-
-void DefaultGCActivityCallback::synchronize()
-{
- if (CFRunLoopGetCurrent() == d->runLoop.get())
- return;
- CFRunLoopRemoveTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
- d->runLoop = CFRunLoopGetCurrent();
- CFRunLoopAddTimer(d->runLoop.get(), d->timer.get(), kCFRunLoopCommonModes);
-}
-
-void DefaultGCActivityCallback::cancel()
-{
- cancelTimer(d.get());
-}
-
-}
projects / apple / javascriptcore.git / blobdiff