gecko/xpcom/base/nsMemoryImpl.cpp
2011-03-28 15:58:49 -04:00

243 lines
6.5 KiB
C++

/* -*- Mode: C++; tab-width: 4; 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.org code.
*
* 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 ***** */
#include "nsXPCOM.h"
#include "nsMemoryImpl.h"
#include "nsThreadUtils.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIServiceManager.h"
#include "nsISupportsArray.h"
#include "prmem.h"
#include "prcvar.h"
#include "pratom.h"
#include "nsAlgorithm.h"
#include "nsAutoLock.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "mozilla/Services.h"
static nsMemoryImpl sGlobalMemory;
NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl, nsIMemory)
NS_IMETHODIMP_(void*)
nsMemoryImpl::Alloc(PRSize size)
{
return NS_Alloc(size);
}
NS_IMETHODIMP_(void*)
nsMemoryImpl::Realloc(void* ptr, PRSize size)
{
return NS_Realloc(ptr, size);
}
NS_IMETHODIMP_(void)
nsMemoryImpl::Free(void* ptr)
{
NS_Free(ptr);
}
NS_IMETHODIMP
nsMemoryImpl::HeapMinimize(PRBool aImmediate)
{
return FlushMemory(NS_LITERAL_STRING("heap-minimize").get(), aImmediate);
}
NS_IMETHODIMP
nsMemoryImpl::IsLowMemory(PRBool *result)
{
NS_ERROR("IsLowMemory is deprecated. See bug 592308.");
*result = PR_FALSE;
return NS_OK;
}
/*static*/ nsresult
nsMemoryImpl::Create(nsISupports* outer, const nsIID& aIID, void **aResult)
{
NS_ENSURE_NO_AGGREGATION(outer);
return sGlobalMemory.QueryInterface(aIID, aResult);
}
nsresult
nsMemoryImpl::FlushMemory(const PRUnichar* aReason, PRBool aImmediate)
{
nsresult rv = NS_OK;
if (aImmediate) {
// They've asked us to run the flusher *immediately*. We've
// got to be on the UI main thread for us to be able to do
// that...are we?
if (!NS_IsMainThread()) {
NS_ERROR("can't synchronously flush memory: not on UI thread");
return NS_ERROR_FAILURE;
}
}
PRInt32 lastVal = PR_ATOMIC_SET(&sIsFlushing, 1);
if (lastVal)
return NS_OK;
PRIntervalTime now = PR_IntervalNow();
// Run the flushers immediately if we can; otherwise, proxy to the
// UI thread an run 'em asynchronously.
if (aImmediate) {
rv = RunFlushers(aReason);
}
else {
// Don't broadcast more than once every 1000ms to avoid being noisy
if (PR_IntervalToMicroseconds(now - sLastFlushTime) > 1000) {
sFlushEvent.mReason = aReason;
rv = NS_DispatchToMainThread(&sFlushEvent, NS_DISPATCH_NORMAL);
}
}
sLastFlushTime = now;
return rv;
}
nsresult
nsMemoryImpl::RunFlushers(const PRUnichar* aReason)
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
// Instead of:
// os->NotifyObservers(this, "memory-pressure", aReason);
// we are going to do this manually to see who/what is
// deallocating.
nsCOMPtr<nsISimpleEnumerator> e;
os->EnumerateObservers("memory-pressure", getter_AddRefs(e));
if ( e ) {
nsCOMPtr<nsIObserver> observer;
PRBool loop = PR_TRUE;
while (NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop)
{
e->GetNext(getter_AddRefs(observer));
if (!observer)
continue;
observer->Observe(observer, "memory-pressure", aReason);
}
}
}
// Run built-in system flushers
#ifdef WINCE_WINDOWS_MOBILE
// This function tries to free up memory for an application.
// If necessary, the shell closes down other applications by
// sending WM_CLOSE messages. We ask for 4MB.
SHCloseApps(1024 * 1024 * 4);
#endif
sIsFlushing = 0;
return NS_OK;
}
// XXX need NS_IMPL_STATIC_ADDREF/RELEASE
NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::AddRef() { return 2; }
NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::Release() { return 1; }
NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl::FlushEvent, nsIRunnable)
NS_IMETHODIMP
nsMemoryImpl::FlushEvent::Run()
{
sGlobalMemory.RunFlushers(mReason);
return NS_OK;
}
PRInt32
nsMemoryImpl::sIsFlushing = 0;
PRIntervalTime
nsMemoryImpl::sLastFlushTime = 0;
nsMemoryImpl::FlushEvent
nsMemoryImpl::sFlushEvent;
XPCOM_API(void*)
NS_Alloc(PRSize size)
{
if (size > PR_INT32_MAX)
return nsnull;
void* result = moz_malloc(size);
if (! result) {
// Request an asynchronous flush
sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
}
return result;
}
XPCOM_API(void*)
NS_Realloc(void* ptr, PRSize size)
{
if (size > PR_INT32_MAX)
return nsnull;
void* result = moz_realloc(ptr, size);
if (! result && size != 0) {
// Request an asynchronous flush
sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
}
return result;
}
XPCOM_API(void)
NS_Free(void* ptr)
{
moz_free(ptr);
}
nsresult
NS_GetMemoryManager(nsIMemory* *result)
{
return sGlobalMemory.QueryInterface(NS_GET_IID(nsIMemory), (void**) result);
}