mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-08-30 01:20:43 +02:00
484 lines
11 KiB
C++
484 lines
11 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 "nsIEventQueueService.h"
|
|
#include "nsIObserverService.h"
|
|
#include "nsIRunnable.h"
|
|
#include "nsIServiceManager.h"
|
|
#include "nsISupportsArray.h"
|
|
#include "nsIThread.h"
|
|
|
|
#include "prmem.h"
|
|
#include "plevent.h"
|
|
|
|
#include "nsAlgorithm.h"
|
|
#include "nsAutoLock.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsString.h"
|
|
|
|
#if defined(XP_WIN) && !defined(WINCE)
|
|
#include <windows.h>
|
|
#define NS_MEMORY_FLUSHER_THREAD
|
|
#else
|
|
// Need to implement the nsIMemory::IsLowMemory() predicate
|
|
#undef NS_MEMORY_FLUSHER_THREAD
|
|
#endif
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Define NS_OUT_OF_MEMORY_TESTER if you want to force memory failures
|
|
|
|
#ifdef DEBUG_xwarren
|
|
#define NS_OUT_OF_MEMORY_TESTER
|
|
#endif
|
|
|
|
#ifdef NS_OUT_OF_MEMORY_TESTER
|
|
|
|
// flush memory one in this number of times:
|
|
#define NS_FLUSH_FREQUENCY 100000
|
|
|
|
// fail allocation one in this number of flushes:
|
|
#define NS_FAIL_FREQUENCY 10
|
|
|
|
PRUint32 gFlushFreq = 0;
|
|
PRUint32 gFailFreq = 0;
|
|
|
|
static void*
|
|
mallocator(PRSize size, PRUint32& counter, PRUint32 max)
|
|
{
|
|
if (counter++ >= max) {
|
|
counter = 0;
|
|
NS_ASSERTION(0, "about to fail allocation... watch out");
|
|
return nsnull;
|
|
}
|
|
return PR_Malloc(size);
|
|
}
|
|
|
|
static void*
|
|
reallocator(void* ptr, PRSize size, PRUint32& counter, PRUint32 max)
|
|
{
|
|
if (counter++ >= max) {
|
|
counter = 0;
|
|
NS_ASSERTION(0, "about to fail reallocation... watch out");
|
|
return nsnull;
|
|
}
|
|
return PR_Realloc(ptr, size);
|
|
}
|
|
|
|
#define MALLOC1(s) mallocator(s, gFlushFreq, NS_FLUSH_FREQUENCY)
|
|
#define REALLOC1(p, s) reallocator(p, s, gFlushFreq, NS_FLUSH_FREQUENCY)
|
|
|
|
#else
|
|
|
|
#define MALLOC1(s) PR_Malloc(s)
|
|
#define REALLOC1(p, s) PR_Realloc(p, s)
|
|
|
|
#endif // NS_OUT_OF_MEMORY_TESTER
|
|
|
|
#if defined(XDEBUG_waterson)
|
|
#define NS_TEST_MEMORY_FLUSHER
|
|
#endif
|
|
|
|
#ifdef NS_MEMORY_FLUSHER_THREAD
|
|
/**
|
|
* A runnable that is used to periodically check the status
|
|
* of the system, determine if too much memory is in use,
|
|
* and if so, trigger a "memory flush".
|
|
*/
|
|
|
|
class MemoryFlusher : public nsIRunnable
|
|
{
|
|
public:
|
|
// We don't use the generic macros because we are a special static object
|
|
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult);
|
|
NS_IMETHOD_(nsrefcnt) AddRef(void) { return 1; }
|
|
NS_IMETHOD_(nsrefcnt) Release(void) { return 1; }
|
|
|
|
NS_DECL_NSIRUNNABLE
|
|
|
|
nsresult Init();
|
|
void StopAndJoin();
|
|
|
|
private:
|
|
static PRBool sRunning;
|
|
static PRIntervalTime sTimeout;
|
|
static PRLock* sLock;
|
|
static PRCondVar* sCVar;
|
|
static nsIThread* sThread;
|
|
|
|
enum {
|
|
kInitialTimeout = 60 /*seconds*/
|
|
};
|
|
};
|
|
|
|
static MemoryFlusher sGlobalMemoryFlusher;
|
|
|
|
#endif // NS_MEMORY_FLUSHER_THREAD
|
|
|
|
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)
|
|
{
|
|
#if defined(WINCE)
|
|
MEMORYSTATUS stat;
|
|
GlobalMemoryStatus(&stat);
|
|
*result = ((float)stat.dwAvailPhys / stat.dwTotalPhys) < 0.1;
|
|
#elif defined(XP_WIN)
|
|
MEMORYSTATUS stat;
|
|
GlobalMemoryStatus(&stat);
|
|
*result = ((float)stat.dwAvailPageFile / stat.dwTotalPageFile) < 0.1;
|
|
#else
|
|
*result = PR_FALSE;
|
|
#endif
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
nsresult
|
|
nsMemoryImpl::Startup()
|
|
{
|
|
sFlushLock = PR_NewLock();
|
|
if (!sFlushLock) return NS_ERROR_FAILURE;
|
|
|
|
#ifdef NS_MEMORY_FLUSHER_THREAD
|
|
return sGlobalMemoryFlusher.Init();
|
|
#else
|
|
return NS_OK;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
nsMemoryImpl::Shutdown()
|
|
{
|
|
#ifdef NS_MEMORY_FLUSHER_THREAD
|
|
sGlobalMemoryFlusher.StopAndJoin();
|
|
#endif
|
|
|
|
if (sFlushLock) PR_DestroyLock(sFlushLock);
|
|
sFlushLock = nsnull;
|
|
}
|
|
|
|
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;
|
|
|
|
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?
|
|
PRBool isOnUIThread = PR_FALSE;
|
|
|
|
nsCOMPtr<nsIThread> main;
|
|
rv = nsIThread::GetMainThread(getter_AddRefs(main));
|
|
if (NS_SUCCEEDED(rv)) {
|
|
nsCOMPtr<nsIThread> current;
|
|
rv = nsIThread::GetCurrent(getter_AddRefs(current));
|
|
if (NS_SUCCEEDED(rv)) {
|
|
if (current == main)
|
|
isOnUIThread = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
if (! isOnUIThread) {
|
|
NS_ERROR("can't synchronously flush memory: not on UI thread");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
}
|
|
|
|
{
|
|
// Are we already flushing?
|
|
nsAutoLock l(sFlushLock);
|
|
if (sIsFlushing)
|
|
return NS_OK;
|
|
|
|
// Well, we are now!
|
|
sIsFlushing = PR_TRUE;
|
|
}
|
|
|
|
// Run the flushers immediately if we can; otherwise, proxy to the
|
|
// UI thread an run 'em asynchronously.
|
|
if (aImmediate) {
|
|
rv = RunFlushers(aReason);
|
|
}
|
|
else {
|
|
nsCOMPtr<nsIEventQueueService> eqs = do_GetService(NS_EVENTQUEUESERVICE_CONTRACTID, &rv);
|
|
if (eqs) {
|
|
nsCOMPtr<nsIEventQueue> eq;
|
|
rv = eqs->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eq));
|
|
if (NS_SUCCEEDED(rv)) {
|
|
PL_InitEvent(&sFlushEvent.mEvent, this, HandleFlushEvent, DestroyFlushEvent);
|
|
sFlushEvent.mReason = aReason;
|
|
|
|
rv = eq->PostEvent(NS_REINTERPRET_CAST(PLEvent*, &sFlushEvent));
|
|
}
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
nsMemoryImpl::RunFlushers(const PRUnichar* aReason)
|
|
{
|
|
nsCOMPtr<nsIObserverService> os = do_GetService("@mozilla.org/observer-service;1");
|
|
if (os) {
|
|
os->NotifyObservers(this, "memory-pressure", aReason);
|
|
}
|
|
|
|
{
|
|
// Done flushing
|
|
nsAutoLock l(sFlushLock);
|
|
sIsFlushing = PR_FALSE;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void*
|
|
nsMemoryImpl::HandleFlushEvent(PLEvent* aEvent)
|
|
{
|
|
FlushEvent* event = NS_REINTERPRET_CAST(FlushEvent*, aEvent);
|
|
|
|
sGlobalMemory.RunFlushers(event->mReason);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
nsMemoryImpl::DestroyFlushEvent(PLEvent* aEvent)
|
|
{
|
|
// no-op, since mEvent is a member of nsMemoryImpl
|
|
}
|
|
|
|
PRLock*
|
|
nsMemoryImpl::sFlushLock;
|
|
|
|
PRBool
|
|
nsMemoryImpl::sIsFlushing = PR_FALSE;
|
|
|
|
nsMemoryImpl::FlushEvent
|
|
nsMemoryImpl::sFlushEvent;
|
|
|
|
extern "C" NS_EXPORT void*
|
|
NS_Alloc(PRSize size)
|
|
{
|
|
NS_ASSERTION(size, "NS_Alloc of size 0");
|
|
if (size > PR_INT32_MAX)
|
|
return nsnull;
|
|
|
|
void* result = MALLOC1(size);
|
|
if (! result) {
|
|
// Request an asynchronous flush
|
|
sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
extern "C" NS_EXPORT void*
|
|
NS_Realloc(void* ptr, PRSize size)
|
|
{
|
|
NS_ASSERTION(size, "NS_Realloc of size 0");
|
|
if (size > PR_INT32_MAX)
|
|
return nsnull;
|
|
|
|
void* result = REALLOC1(ptr, size);
|
|
if (! result) {
|
|
// Request an asynchronous flush
|
|
sGlobalMemory.FlushMemory(NS_LITERAL_STRING("alloc-failure").get(), PR_FALSE);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
extern "C" NS_EXPORT void
|
|
NS_Free(void* ptr)
|
|
{
|
|
PR_Free(ptr);
|
|
}
|
|
|
|
#ifdef NS_MEMORY_FLUSHER_THREAD
|
|
|
|
NS_IMPL_QUERY_INTERFACE1(MemoryFlusher, nsIRunnable)
|
|
|
|
NS_IMETHODIMP
|
|
MemoryFlusher::Run()
|
|
{
|
|
nsresult rv;
|
|
|
|
sRunning = PR_TRUE;
|
|
|
|
while (1) {
|
|
PRStatus status;
|
|
|
|
{
|
|
nsAutoLock l(sLock);
|
|
if (! sRunning) {
|
|
rv = NS_OK;
|
|
break;
|
|
}
|
|
|
|
status = PR_WaitCondVar(sCVar, sTimeout);
|
|
}
|
|
|
|
if (status != PR_SUCCESS) {
|
|
rv = NS_ERROR_FAILURE;
|
|
break;
|
|
}
|
|
|
|
if (! sRunning) {
|
|
rv = NS_OK;
|
|
break;
|
|
}
|
|
|
|
PRBool isLowMemory;
|
|
rv = sGlobalMemory.IsLowMemory(&isLowMemory);
|
|
if (NS_FAILED(rv))
|
|
break;
|
|
|
|
#ifdef NS_TEST_MEMORY_FLUSHER
|
|
// Fire the flusher *every* time
|
|
isLowMemory = PR_TRUE;
|
|
#endif
|
|
|
|
if (isLowMemory) {
|
|
sGlobalMemory.FlushMemory(NS_LITERAL_STRING("low-memory").get(), PR_FALSE);
|
|
}
|
|
}
|
|
|
|
sRunning = PR_FALSE;
|
|
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
MemoryFlusher::Init()
|
|
{
|
|
sTimeout = PR_SecondsToInterval(kInitialTimeout);
|
|
sLock = PR_NewLock();
|
|
if (!sLock) return NS_ERROR_FAILURE;
|
|
|
|
sCVar = PR_NewCondVar(sLock);
|
|
if (!sCVar) return NS_ERROR_FAILURE;
|
|
|
|
return NS_NewThread(&sThread,
|
|
this,
|
|
0, /* XXX use default stack size? */
|
|
PR_JOINABLE_THREAD);
|
|
}
|
|
|
|
void
|
|
MemoryFlusher::StopAndJoin()
|
|
{
|
|
if (sRunning) {
|
|
{
|
|
nsAutoLock l(sLock);
|
|
sRunning = PR_FALSE;
|
|
PR_NotifyCondVar(sCVar);
|
|
}
|
|
|
|
if (sThread)
|
|
sThread->Join();
|
|
}
|
|
|
|
NS_IF_RELEASE(sThread);
|
|
|
|
if (sLock)
|
|
PR_DestroyLock(sLock);
|
|
|
|
if (sCVar)
|
|
PR_DestroyCondVar(sCVar);
|
|
}
|
|
|
|
|
|
PRBool
|
|
MemoryFlusher::sRunning;
|
|
|
|
PRIntervalTime
|
|
MemoryFlusher::sTimeout;
|
|
|
|
PRLock*
|
|
MemoryFlusher::sLock;
|
|
|
|
PRCondVar*
|
|
MemoryFlusher::sCVar;
|
|
|
|
nsIThread*
|
|
MemoryFlusher::sThread;
|
|
|
|
#endif // NS_MEMORY_FLUSHER_THREAD
|
|
|
|
nsresult
|
|
NS_GetMemoryManager(nsIMemory* *result)
|
|
{
|
|
return sGlobalMemory.QueryInterface(NS_GET_IID(nsIMemory), (void**) result);
|
|
}
|