mirror of
https://github.com/mozilla/gecko-dev.git
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595 lines
14 KiB
C++
595 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsMemoryImpl.h"
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#include "prmem.h"
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#include "nsAlgorithm.h"
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#include "nsIServiceManager.h"
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#include "nsIObserverService.h"
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#include "nsAutoLock.h"
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#include "nsIThread.h"
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#include "nsIEventQueueService.h"
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#include "nsString.h"
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#if defined(XP_WIN)
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#include <windows.h>
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#define NS_MEMORY_FLUSHER_THREAD
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#elif defined(XP_MAC)
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#include <MacMemory.h>
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#define NS_MEMORY_FLUSHER_THREAD
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#else
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// Need to implement the nsIMemory::IsLowMemory() predicate
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#undef NS_MEMORY_FLUSHER_THREAD
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#endif
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//----------------------------------------------------------------------
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#if defined(XDEBUG_waterson)
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#define NS_TEST_MEMORY_FLUSHER
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#endif
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/**
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* A runnable that is used to periodically check the status
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* of the system, determine if too much memory is in use,
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* and if so, trigger a "memory flush".
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*/
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class MemoryFlusher : public nsIRunnable
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{
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protected:
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nsMemoryImpl* mMemoryImpl; // WEAK, it owns us.
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PRBool mRunning;
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PRIntervalTime mTimeout;
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PRLock* mLock;
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PRCondVar* mCVar;
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MemoryFlusher(nsMemoryImpl* aMemoryImpl);
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virtual ~MemoryFlusher();
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enum {
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kInitialTimeout = 60 /*seconds*/
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};
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public:
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/**
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* Create a memory flusher.
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* @param aResult the memory flusher
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* @param aMemoryImpl the owning nsMemoryImpl object
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* @return NS_OK if the memory flusher was created successfully
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*/
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static nsresult
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Create(MemoryFlusher** aResult, nsMemoryImpl* aMemoryImpl);
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NS_DECL_ISUPPORTS
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NS_DECL_NSIRUNNABLE
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/**
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* Stop the memory flusher.
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*/
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nsresult Stop();
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};
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MemoryFlusher::MemoryFlusher(nsMemoryImpl* aMemoryImpl)
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: mMemoryImpl(aMemoryImpl),
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mRunning(PR_FALSE),
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mTimeout(PR_SecondsToInterval(kInitialTimeout)),
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mLock(nsnull),
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mCVar(nsnull)
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{
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NS_INIT_REFCNT();
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}
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MemoryFlusher::~MemoryFlusher()
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{
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if (mLock)
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PR_DestroyLock(mLock);
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if (mCVar)
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PR_DestroyCondVar(mCVar);
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}
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nsresult
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MemoryFlusher::Create(MemoryFlusher** aResult, nsMemoryImpl* aMemoryImpl)
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{
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MemoryFlusher* result = new MemoryFlusher(aMemoryImpl);
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if (! result)
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return NS_ERROR_OUT_OF_MEMORY;
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do {
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if ((result->mLock = PR_NewLock()) == nsnull)
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break;
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if ((result->mCVar = PR_NewCondVar(result->mLock)) == nsnull)
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break;
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NS_ADDREF(*aResult = result);
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return NS_OK;
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} while (0);
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// Something bad happened if we get here...
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delete result;
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return NS_ERROR_OUT_OF_MEMORY;
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}
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NS_IMPL_THREADSAFE_ISUPPORTS1(MemoryFlusher, nsIRunnable)
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NS_IMETHODIMP
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MemoryFlusher::Run()
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{
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nsresult rv;
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mRunning = PR_TRUE;
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while (1) {
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PRStatus status;
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{
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nsAutoLock l(mLock);
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if (! mRunning) {
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rv = NS_OK;
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break;
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}
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status = PR_WaitCondVar(mCVar, mTimeout);
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}
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if (status != PR_SUCCESS) {
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rv = NS_ERROR_FAILURE;
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break;
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}
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if (! mRunning) {
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rv = NS_OK;
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break;
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}
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PRBool isLowMemory;
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rv = mMemoryImpl->IsLowMemory(&isLowMemory);
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if (NS_FAILED(rv))
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break;
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#ifdef NS_TEST_MEMORY_FLUSHER
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// Fire the flusher *every* time
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isLowMemory = PR_TRUE;
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#endif
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if (isLowMemory) {
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mMemoryImpl->FlushMemory(NS_MEMORY_PRESSURE_LOW_MEMORY, PR_FALSE);
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}
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}
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mRunning = PR_FALSE;
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return rv;
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}
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nsresult
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MemoryFlusher::Stop()
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{
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if (mRunning) {
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nsAutoLock l(mLock);
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mRunning = PR_FALSE;
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PR_NotifyCondVar(mCVar);
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}
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return NS_OK;
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}
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//----------------------------------------------------------------------
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsMemoryImpl, nsIMemory)
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NS_METHOD
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nsMemoryImpl::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
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{
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NS_ENSURE_ARG_POINTER(aInstancePtr);
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NS_ENSURE_PROPER_AGGREGATION(outer, aIID);
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nsMemoryImpl* mm = new nsMemoryImpl();
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if (mm == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv;
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do {
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rv = mm->QueryInterface(aIID, aInstancePtr);
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if (NS_FAILED(rv))
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break;
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rv = NS_ERROR_OUT_OF_MEMORY;
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mm->mFlushLock = PR_NewLock();
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if (! mm->mFlushLock)
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break;
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rv = NS_OK;
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} while (0);
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if (NS_FAILED(rv))
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delete mm;
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return rv;
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}
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nsMemoryImpl::nsMemoryImpl()
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: mFlusher(nsnull),
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mFlushLock(nsnull),
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mIsFlushing(PR_FALSE)
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{
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NS_INIT_REFCNT();
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}
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nsMemoryImpl::~nsMemoryImpl()
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{
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if (mFlushLock)
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PR_DestroyLock(mFlushLock);
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}
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////////////////////////////////////////////////////////////////////////////////
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// Define NS_OUT_OF_MEMORY_TESTER if you want to force memory failures
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#ifdef DEBUG_xwarren
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#define NS_OUT_OF_MEMORY_TESTER
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#endif
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#ifdef NS_OUT_OF_MEMORY_TESTER
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// flush memory one in this number of times:
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#define NS_FLUSH_FREQUENCY 100000
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// fail allocation one in this number of flushes:
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#define NS_FAIL_FREQUENCY 10
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PRUint32 gFlushFreq = 0;
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PRUint32 gFailFreq = 0;
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static void*
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mallocator(PRSize size, PRUint32& counter, PRUint32 max)
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{
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if (counter++ >= max) {
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counter = 0;
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NS_ASSERTION(0, "about to fail allocation... watch out");
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return nsnull;
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}
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return PR_Malloc(size);
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}
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static void*
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reallocator(void* ptr, PRSize size, PRUint32& counter, PRUint32 max)
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{
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if (counter++ >= max) {
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counter = 0;
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NS_ASSERTION(0, "about to fail reallocation... watch out");
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return nsnull;
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}
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return PR_Realloc(ptr, size);
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}
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#define MALLOC1(s) mallocator(s, gFlushFreq, NS_FLUSH_FREQUENCY)
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#define REALLOC1(p, s) reallocator(p, s, gFlushFreq, NS_FLUSH_FREQUENCY)
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#else
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#define MALLOC1(s) PR_Malloc(s)
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#define REALLOC1(p, s) PR_Realloc(p, s)
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#endif // NS_OUT_OF_MEMORY_TESTER
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////////////////////////////////////////////////////////////////////////////////
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NS_IMETHODIMP_(void *)
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nsMemoryImpl::Alloc(PRSize size)
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{
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void* result = MALLOC1(size);
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if (! result) {
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// Request an asynchronous flush
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FlushMemory(NS_MEMORY_PRESSURE_ALLOC_FAILURE, PR_FALSE);
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}
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return result;
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}
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NS_IMETHODIMP_(void *)
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nsMemoryImpl::Realloc(void * ptr, PRSize size)
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{
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void* result = REALLOC1(ptr, size);
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if (! result) {
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// Request an asynchronous flush
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FlushMemory(NS_MEMORY_PRESSURE_ALLOC_FAILURE, PR_FALSE);
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}
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return result;
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}
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NS_IMETHODIMP_(void)
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nsMemoryImpl::Free(void * ptr)
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{
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PR_Free(ptr);
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}
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NS_IMETHODIMP
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nsMemoryImpl::HeapMinimize(PRBool aImmediate)
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{
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return FlushMemory(NS_MEMORY_PRESSURE_HEAP_MINIMIZE, aImmediate);
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}
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NS_IMETHODIMP
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nsMemoryImpl::IsLowMemory(PRBool *result)
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{
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#if defined(XP_WIN)
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MEMORYSTATUS stat;
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GlobalMemoryStatus(&stat);
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*result = ((float)stat.dwAvailPageFile / stat.dwTotalPageFile) < 0.1;
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#elif defined(XP_MAC)
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const long kReserveHeapFreeSpace = (256 * 1024);
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const long kReserveHeapContigSpace = (128 * 1024);
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long totalSpace, contiguousSpace;
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// this call measures how much memory would be available if the OS
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// purged. Despite the name, it does not purge (that happens
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// automatically when heap space is low).
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::PurgeSpace(&totalSpace, &contiguousSpace);
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if (totalSpace < kReserveHeapFreeSpace || contiguousSpace < kReserveHeapContigSpace)
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{
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NS_WARNING("Found that heap mem is low");
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*result = PR_TRUE;
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return NS_OK;
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}
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// see how much temp mem is available (since our allocators allocate 1Mb chunks
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// in temp mem. We don't use TempMaxMem() (to get contig space) here, because it
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// compacts the application heap, so can be slow.
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const long kReserveTempFreeSpace = (2 * 1024 * 1024); // 2Mb
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long totalTempSpace = ::TempFreeMem();
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if (totalTempSpace < kReserveTempFreeSpace)
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{
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NS_WARNING("Found that temp mem is low");
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*result = PR_TRUE;
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return NS_OK;
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}
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*result = PR_FALSE;
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#else
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*result = PR_FALSE;
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#endif
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return NS_OK;
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}
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nsresult
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nsMemoryImpl::FlushMemory(const PRUnichar* aReason, PRBool aImmediate)
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{
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nsresult rv;
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if (aImmediate) {
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// They've asked us to run the flusher *immediately*. We've
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// got to be on the UI main thread for us to be able to do
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// that...are we?
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PRBool isOnUIThread = PR_FALSE;
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nsCOMPtr<nsIThread> main;
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rv = nsIThread::GetMainThread(getter_AddRefs(main));
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if (NS_SUCCEEDED(rv)) {
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nsCOMPtr<nsIThread> current;
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rv = nsIThread::GetCurrent(getter_AddRefs(current));
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if (NS_SUCCEEDED(rv)) {
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if (current == main)
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isOnUIThread = PR_TRUE;
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}
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}
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if (! isOnUIThread) {
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NS_ERROR("can't synchronously flush memory: not on UI thread");
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return NS_ERROR_FAILURE;
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}
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}
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{
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// Are we already flushing?
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nsAutoLock l(mFlushLock);
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if (mIsFlushing)
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return NS_OK;
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// Well, we are now!
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mIsFlushing = PR_TRUE;
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}
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// Run the flushers immediately if we can; otherwise, proxy to the
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// UI thread an run 'em asynchronously.
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if (aImmediate) {
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rv = RunFlushers(this, aReason);
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}
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else {
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nsCOMPtr<nsIEventQueueService> eqs = do_GetService(NS_EVENTQUEUESERVICE_CONTRACTID, &rv);
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if (eqs) {
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nsCOMPtr<nsIEventQueue> eq;
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rv = eqs->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eq));
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if (NS_SUCCEEDED(rv)) {
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PL_InitEvent(&mFlushEvent.mEvent, this, HandleFlushEvent, DestroyFlushEvent);
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mFlushEvent.mReason = aReason;
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rv = eq->PostEvent(NS_REINTERPRET_CAST(PLEvent*, &mFlushEvent));
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}
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}
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}
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return rv;
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}
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nsresult
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nsMemoryImpl::RunFlushers(nsMemoryImpl* aSelf, const PRUnichar* aReason)
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{
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nsCOMPtr<nsIObserverService> os = do_GetService(NS_OBSERVERSERVICE_CONTRACTID);
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if (os) {
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os->Notify(aSelf, NS_MEMORY_PRESSURE_TOPIC, aReason);
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}
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{
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// Done flushing
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nsAutoLock l(aSelf->mFlushLock);
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aSelf->mIsFlushing = PR_FALSE;
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}
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return NS_OK;
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}
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void*
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nsMemoryImpl::HandleFlushEvent(PLEvent* aEvent)
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{
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nsMemoryImpl* self = NS_STATIC_CAST(nsMemoryImpl*, PL_GetEventOwner(aEvent));
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FlushEvent* event = NS_REINTERPRET_CAST(FlushEvent*, aEvent);
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RunFlushers(self, event->mReason);
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return 0;
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}
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void
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nsMemoryImpl::DestroyFlushEvent(PLEvent* aEvent)
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{
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// no-op, since mEvent is a member of nsMemoryImpl
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}
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nsMemoryImpl* gMemory = nsnull;
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static void
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EnsureGlobalMemoryService()
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{
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if (gMemory) return;
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nsresult rv = nsMemoryImpl::Create(nsnull, NS_GET_IID(nsIMemory), (void**)&gMemory);
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NS_ASSERTION(NS_SUCCEEDED(rv), "nsMemoryImpl::Create failed");
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NS_ASSERTION(gMemory, "improper xpcom initialization");
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}
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nsresult
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nsMemoryImpl::Startup()
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{
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EnsureGlobalMemoryService();
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if (! gMemory)
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return NS_ERROR_FAILURE;
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#ifdef NS_MEMORY_FLUSHER_THREAD
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nsresult rv;
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// Create and start a memory flusher thread
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rv = MemoryFlusher::Create(&gMemory->mFlusher, gMemory);
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if (NS_FAILED(rv)) return rv;
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rv = NS_NewThread(getter_AddRefs(gMemory->mFlusherThread),
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gMemory->mFlusher,
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0, /* XXX use default stack size? */
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PR_JOINABLE_THREAD);
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if (NS_FAILED(rv)) return rv;
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#endif
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return NS_OK;
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}
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nsresult
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nsMemoryImpl::Shutdown()
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{
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if (gMemory) {
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#ifdef NS_MEMORY_FLUSHER_THREAD
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if (gMemory->mFlusher) {
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// Stop the runnable...
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gMemory->mFlusher->Stop();
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NS_RELEASE(gMemory->mFlusher);
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// ...and wait for the thread to exit
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if (gMemory->mFlusherThread)
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gMemory->mFlusherThread->Join();
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}
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#endif
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NS_RELEASE(gMemory);
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gMemory = nsnull;
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}
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// nsMemory static helper routines
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NS_EXPORT void*
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nsMemory::Alloc(PRSize size)
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{
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if (gMemory == nsnull) {
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EnsureGlobalMemoryService();
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}
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return gMemory->Alloc(size);
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}
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NS_EXPORT void*
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nsMemory::Realloc(void* ptr, PRSize size)
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{
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if (gMemory == nsnull) {
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EnsureGlobalMemoryService();
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}
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return gMemory->Realloc(ptr, size);
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}
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NS_EXPORT void
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nsMemory::Free(void* ptr)
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{
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if (gMemory == nsnull) {
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EnsureGlobalMemoryService();
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}
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gMemory->Free(ptr);
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}
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NS_EXPORT nsresult
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nsMemory::HeapMinimize(PRBool aImmediate)
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{
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if (gMemory == nsnull) {
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EnsureGlobalMemoryService();
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}
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return gMemory->HeapMinimize(aImmediate);
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}
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NS_EXPORT void*
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nsMemory::Clone(const void* ptr, PRSize size)
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{
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if (gMemory == nsnull) {
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EnsureGlobalMemoryService();
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}
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void* newPtr = gMemory->Alloc(size);
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|
if (newPtr)
|
|
memcpy(newPtr, ptr, size);
|
|
return newPtr;
|
|
}
|
|
|
|
NS_EXPORT nsIMemory*
|
|
nsMemory::GetGlobalMemoryService()
|
|
{
|
|
if (gMemory == nsnull) {
|
|
EnsureGlobalMemoryService();
|
|
}
|
|
NS_ADDREF(gMemory);
|
|
return gMemory;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
|