зеркало из https://github.com/mozilla/pjs.git
385 строки
9.9 KiB
C++
385 строки
9.9 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 "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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#define NS_MEMORY_FLUSHER
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#elif 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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const char* kHighMark = "/sys/kernel/high_watermark";
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#else
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// Need to implement the nsIMemory::IsLowMemory() predicate
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#undef NS_MEMORY_FLUSHER
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#endif
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#ifdef NS_MEMORY_FLUSHER
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#include "nsITimer.h"
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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
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/**
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* A class that is used to periodically check the status of the system,
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* determine if too much memory is in use, and if so, trigger a "memory flush".
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*/
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class MemoryFlusher : public nsITimerCallback
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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 2; }
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NS_IMETHOD_(nsrefcnt) Release(void) { return 1; }
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NS_DECL_NSITIMERCALLBACK
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nsresult Init();
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void StopAndJoin();
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private:
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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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enum {
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kTimeout = 60000 // milliseconds
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};
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};
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static MemoryFlusher sGlobalMemoryFlusher;
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#endif // NS_MEMORY_FLUSHER
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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)
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*result = PR_FALSE;
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// See bug 475595 -- this is incorrect right now, and causes a big
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// perf hit since GlobalMemoryStatus has to grab a kernel VM lock
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// and do a bunch of munging through VM pages to get the data
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// that's requested. We call IsLowMemory in some performance
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// critical code (e.g. during painting), so that's bad.
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#if 0
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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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#endif
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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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int fd = open (kHighMark, O_RDONLY);
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if (fd == -1) {
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*result = PR_FALSE;
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return NS_OK;
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}
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int c = 0;
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read (fd, &c, 1);
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close(fd);
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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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return NS_OK;
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}
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/*static*/ nsresult
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nsMemoryImpl::InitFlusher()
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{
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#ifdef NS_MEMORY_FLUSHER
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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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/*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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// 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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sFlushEvent.mReason = aReason;
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rv = NS_DispatchToMainThread(&sFlushEvent, NS_DISPATCH_NORMAL);
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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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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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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 = 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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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 = REALLOC1(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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#ifdef NS_MEMORY_FLUSHER
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NS_IMPL_QUERY_INTERFACE1(MemoryFlusher, nsITimerCallback)
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NS_IMETHODIMP
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MemoryFlusher::Notify(nsITimer *timer)
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{
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PRBool isLowMemory;
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sGlobalMemory.IsLowMemory(&isLowMemory);
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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(),
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PR_FALSE);
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return NS_OK;
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}
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nsresult
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MemoryFlusher::Init()
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{
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nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID);
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NS_ENSURE_STATE(timer);
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// There is no need to keep a reference to the timer object because we
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// don't need to kill the timer. It will be killed automatically when
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// XPCOM is shutdown.
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return timer->InitWithCallback(this, kTimeout,
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nsITimer::TYPE_REPEATING_SLACK);
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}
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#endif // NS_MEMORY_FLUSHER
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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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