mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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312 lines
8.2 KiB
C++
312 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsXPCOM.h"
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#include "nsMemoryImpl.h"
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#include "nsThreadUtils.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "nsIServiceManager.h"
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#include "nsISupportsArray.h"
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#include "prmem.h"
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#include "prcvar.h"
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#include "pratom.h"
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#include "nsAlgorithm.h"
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#include "nsAutoLock.h"
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#include "nsCOMPtr.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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#endif
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#if defined (NS_OSSO)
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#include <osso-mem.h>
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#include <fcntl.h>
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#include <unistd.h>
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static const char kHighMark[] = "/sys/kernel/high_watermark";
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#endif
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// Some platforms notify you when system memory is low, others do not.
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// In the case of those that do not, we want to post low memory
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// notifications from IsLowMemory(). For those that can notify us, that
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// code usually lives in toolkit.
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#ifdef WINCE
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#define NOTIFY_LOW_MEMORY
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#endif
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#ifdef WINCE_WINDOWS_MOBILE
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#include "aygshell.h"
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#endif
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#include "nsITimer.h"
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static nsMemoryImpl sGlobalMemory;
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NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl, nsIMemory)
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NS_IMETHODIMP_(void*)
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nsMemoryImpl::Alloc(PRSize size)
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{
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return NS_Alloc(size);
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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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return NS_Realloc(ptr, size);
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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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NS_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_LITERAL_STRING("heap-minimize").get(), aImmediate);
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}
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/* this magic number is something greater than 40mb
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* and after all, 40mb should be good enough for any web app
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* unless it's part of an office suite.
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*/
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static const int kRequiredMemory = 0x3000000;
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NS_IMETHODIMP
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nsMemoryImpl::IsLowMemory(PRBool *result)
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{
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#if defined(WINCE_WINDOWS_MOBILE)
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MEMORYSTATUS stat;
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GlobalMemoryStatus(&stat);
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*result = (stat.dwMemoryLoad >= 98);
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#elif defined(WINCE)
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// Bug 525323 - GlobalMemoryStatus kills perf on WinCE.
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*result = PR_FALSE;
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#elif defined(XP_WIN)
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MEMORYSTATUSEX stat;
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stat.dwLength = sizeof stat;
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GlobalMemoryStatusEx(&stat);
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*result = (stat.ullAvailPageFile < kRequiredMemory) &&
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((float)stat.ullAvailPageFile / stat.ullTotalPageFile) < 0.1;
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#elif defined(NS_OSSO)
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static int osso_highmark_fd = -1;
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if (osso_highmark_fd == -1) {
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osso_highmark_fd = open (kHighMark, O_RDONLY);
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if (osso_highmark_fd == -1) {
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NS_ERROR("can't find the osso highmark file");
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*result = PR_FALSE;
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return NS_OK;
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}
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}
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// be kind, rewind.
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lseek(osso_highmark_fd, 0L, SEEK_SET);
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int c = 0;
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read (osso_highmark_fd, &c, 1);
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*result = (c == '1');
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#else
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*result = PR_FALSE;
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#endif
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#ifdef NOTIFY_LOW_MEMORY
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if (*result) {
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sGlobalMemory.FlushMemory(NS_LITERAL_STRING("low-memory").get(), PR_FALSE);
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}
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#endif
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return NS_OK;
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}
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/*static*/ nsresult
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nsMemoryImpl::Create(nsISupports* outer, const nsIID& aIID, void **aResult)
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{
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NS_ENSURE_NO_AGGREGATION(outer);
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return sGlobalMemory.QueryInterface(aIID, aResult);
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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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if (!NS_IsMainThread()) {
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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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PRInt32 lastVal = PR_AtomicSet(&sIsFlushing, 1);
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if (lastVal)
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return NS_OK;
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PRIntervalTime now = PR_IntervalNow();
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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(aReason);
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}
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else {
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// Don't broadcast more than once every 1000ms to avoid being noisy
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if (PR_IntervalToMicroseconds(now - sLastFlushTime) > 1000) {
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sFlushEvent.mReason = aReason;
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rv = NS_DispatchToMainThread(&sFlushEvent, NS_DISPATCH_NORMAL);
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}
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}
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sLastFlushTime = now;
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return rv;
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}
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nsresult
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nsMemoryImpl::RunFlushers(const PRUnichar* aReason)
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{
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nsCOMPtr<nsIObserverService> os = do_GetService("@mozilla.org/observer-service;1");
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if (os) {
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// Instead of:
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// os->NotifyObservers(this, "memory-pressure", aReason);
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// we are going to do this manually to see who/what is
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// deallocating.
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nsCOMPtr<nsISimpleEnumerator> e;
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os->EnumerateObservers("memory-pressure", getter_AddRefs(e));
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if ( e ) {
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nsCOMPtr<nsIObserver> observer;
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PRBool loop = PR_TRUE;
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while (NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop)
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{
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e->GetNext(getter_AddRefs(observer));
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if (!observer)
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continue;
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observer->Observe(observer, "memory-pressure", aReason);
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}
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}
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}
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// Run built-in system flushers
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#ifdef WINCE_WINDOWS_MOBILE
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// This function tries to free up memory for an application.
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// If necessary, the shell closes down other applications by
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// sending WM_CLOSE messages. We ask for 4MB.
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SHCloseApps(1024 * 1024 * 4);
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#endif
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sIsFlushing = 0;
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return NS_OK;
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}
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// XXX need NS_IMPL_STATIC_ADDREF/RELEASE
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NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::AddRef() { return 2; }
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NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::Release() { return 1; }
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NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl::FlushEvent, nsIRunnable)
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NS_IMETHODIMP
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nsMemoryImpl::FlushEvent::Run()
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{
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sGlobalMemory.RunFlushers(mReason);
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return NS_OK;
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}
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PRInt32
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nsMemoryImpl::sIsFlushing = 0;
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PRIntervalTime
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nsMemoryImpl::sLastFlushTime = 0;
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nsMemoryImpl::FlushEvent
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nsMemoryImpl::sFlushEvent;
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XPCOM_API(void*)
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NS_Alloc(PRSize size)
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{
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if (size > PR_INT32_MAX)
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return nsnull;
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void* result = PR_Malloc(size);
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if (! result) {
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// Request an asynchronous flush
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sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
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}
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return result;
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}
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XPCOM_API(void*)
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NS_Realloc(void* ptr, PRSize size)
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{
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if (size > PR_INT32_MAX)
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return nsnull;
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void* result = PR_Realloc(ptr, size);
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if (! result && size != 0) {
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// Request an asynchronous flush
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sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
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}
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return result;
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}
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XPCOM_API(void)
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NS_Free(void* ptr)
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{
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PR_Free(ptr);
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}
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nsresult
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NS_GetMemoryManager(nsIMemory* *result)
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{
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return sGlobalMemory.QueryInterface(NS_GET_IID(nsIMemory), (void**) result);
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}
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