mirror of
https://github.com/rn10950/RetroZilla.git
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484 lines
11 KiB
C++
484 lines
11 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 "nsIEventQueueService.h"
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#include "nsIObserverService.h"
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#include "nsIRunnable.h"
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#include "nsIServiceManager.h"
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#include "nsISupportsArray.h"
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#include "nsIThread.h"
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#include "prmem.h"
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#include "plevent.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) && !defined(WINCE)
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#include <windows.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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// 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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#if defined(XDEBUG_waterson)
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#define NS_TEST_MEMORY_FLUSHER
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#endif
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#ifdef NS_MEMORY_FLUSHER_THREAD
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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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public:
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// We don't use the generic macros because we are a special static object
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult);
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NS_IMETHOD_(nsrefcnt) AddRef(void) { return 1; }
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NS_IMETHOD_(nsrefcnt) Release(void) { return 1; }
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NS_DECL_NSIRUNNABLE
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nsresult Init();
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void StopAndJoin();
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private:
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static PRBool sRunning;
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static PRIntervalTime sTimeout;
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static PRLock* sLock;
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static PRCondVar* sCVar;
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static nsIThread* sThread;
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enum {
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kInitialTimeout = 60 /*seconds*/
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};
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};
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static MemoryFlusher sGlobalMemoryFlusher;
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#endif // NS_MEMORY_FLUSHER_THREAD
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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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NS_IMETHODIMP
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nsMemoryImpl::IsLowMemory(PRBool *result)
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{
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#if defined(WINCE)
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MEMORYSTATUS stat;
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GlobalMemoryStatus(&stat);
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*result = ((float)stat.dwAvailPhys / stat.dwTotalPhys) < 0.1;
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#elif 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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#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::Startup()
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{
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sFlushLock = PR_NewLock();
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if (!sFlushLock) return NS_ERROR_FAILURE;
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#ifdef NS_MEMORY_FLUSHER_THREAD
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return sGlobalMemoryFlusher.Init();
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#else
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return NS_OK;
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#endif
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}
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void
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nsMemoryImpl::Shutdown()
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{
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#ifdef NS_MEMORY_FLUSHER_THREAD
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sGlobalMemoryFlusher.StopAndJoin();
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#endif
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if (sFlushLock) PR_DestroyLock(sFlushLock);
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sFlushLock = nsnull;
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}
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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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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(sFlushLock);
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if (sIsFlushing)
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return NS_OK;
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// Well, we are now!
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sIsFlushing = 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(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(&sFlushEvent.mEvent, this, HandleFlushEvent, DestroyFlushEvent);
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sFlushEvent.mReason = aReason;
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rv = eq->PostEvent(NS_REINTERPRET_CAST(PLEvent*, &sFlushEvent));
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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(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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os->NotifyObservers(this, "memory-pressure", aReason);
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}
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{
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// Done flushing
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nsAutoLock l(sFlushLock);
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sIsFlushing = 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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FlushEvent* event = NS_REINTERPRET_CAST(FlushEvent*, aEvent);
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sGlobalMemory.RunFlushers(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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PRLock*
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nsMemoryImpl::sFlushLock;
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PRBool
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nsMemoryImpl::sIsFlushing = PR_FALSE;
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nsMemoryImpl::FlushEvent
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nsMemoryImpl::sFlushEvent;
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extern "C" NS_EXPORT void*
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NS_Alloc(PRSize size)
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{
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NS_ASSERTION(size, "NS_Alloc of size 0");
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if (size > PR_INT32_MAX)
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return nsnull;
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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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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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extern "C" NS_EXPORT void*
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NS_Realloc(void* ptr, PRSize size)
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{
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NS_ASSERTION(size, "NS_Realloc of size 0");
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if (size > PR_INT32_MAX)
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return nsnull;
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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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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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extern "C" NS_EXPORT 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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#ifdef NS_MEMORY_FLUSHER_THREAD
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NS_IMPL_QUERY_INTERFACE1(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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sRunning = PR_TRUE;
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while (1) {
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PRStatus status;
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{
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nsAutoLock l(sLock);
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if (! sRunning) {
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rv = NS_OK;
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break;
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}
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status = PR_WaitCondVar(sCVar, sTimeout);
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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 (! sRunning) {
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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 = sGlobalMemory.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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sGlobalMemory.FlushMemory(NS_LITERAL_STRING("low-memory").get(), PR_FALSE);
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}
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}
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sRunning = PR_FALSE;
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return rv;
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}
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nsresult
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MemoryFlusher::Init()
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{
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sTimeout = PR_SecondsToInterval(kInitialTimeout);
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sLock = PR_NewLock();
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if (!sLock) return NS_ERROR_FAILURE;
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sCVar = PR_NewCondVar(sLock);
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if (!sCVar) return NS_ERROR_FAILURE;
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return NS_NewThread(&sThread,
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this,
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0, /* XXX use default stack size? */
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PR_JOINABLE_THREAD);
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}
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void
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MemoryFlusher::StopAndJoin()
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{
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if (sRunning) {
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{
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nsAutoLock l(sLock);
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sRunning = PR_FALSE;
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PR_NotifyCondVar(sCVar);
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}
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if (sThread)
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sThread->Join();
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}
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NS_IF_RELEASE(sThread);
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if (sLock)
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PR_DestroyLock(sLock);
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if (sCVar)
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PR_DestroyCondVar(sCVar);
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}
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PRBool
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MemoryFlusher::sRunning;
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PRIntervalTime
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MemoryFlusher::sTimeout;
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PRLock*
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MemoryFlusher::sLock;
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PRCondVar*
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MemoryFlusher::sCVar;
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nsIThread*
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MemoryFlusher::sThread;
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#endif // NS_MEMORY_FLUSHER_THREAD
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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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