LCOV - code coverage report
Current view: directory - ipc/glue - SharedMemory.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 35 0 0.0 %
Date: 2012-06-02 Functions: 28 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=8 et :
       3                 :  */
       4                 : /* ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at:
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is Mozilla Code.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  *   The Mozilla Foundation
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *   Chris Jones <jones.chris.g@gmail.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : #include <math.h>
      42                 : 
      43                 : #include "nsString.h"
      44                 : #include "nsIMemoryReporter.h"
      45                 : #include "mozilla/ipc/SharedMemory.h"
      46                 : 
      47                 : namespace mozilla {
      48                 : namespace ipc {
      49                 : 
      50                 : static PRInt64 gShmemAllocated;
      51                 : static PRInt64 gShmemMapped;
      52               0 : static PRInt64 GetShmemAllocated() { return gShmemAllocated; }
      53               0 : static PRInt64 GetShmemMapped() { return gShmemMapped; }
      54                 : 
      55               0 : NS_MEMORY_REPORTER_IMPLEMENT(ShmemAllocated,
      56                 :     "shmem-allocated",
      57                 :     KIND_OTHER,
      58                 :     UNITS_BYTES,
      59                 :     GetShmemAllocated,
      60                 :     "Memory shared with other processes that is accessible (but not "
      61               0 :     "necessarily mapped).")
      62               0 : NS_MEMORY_REPORTER_IMPLEMENT(ShmemMapped,
      63                 :     "shmem-mapped",
      64                 :     KIND_OTHER,
      65                 :     UNITS_BYTES,
      66                 :     GetShmemMapped,
      67               0 :     "Memory shared with other processes that is mapped into the address space.")
      68                 : 
      69               0 : SharedMemory::SharedMemory()
      70                 :   : mAllocSize(0)
      71               0 :   , mMappedSize(0)
      72                 : {
      73                 :   // NB: SharedMemory is main-thread-only at the moment, but that may
      74                 :   // change soon
      75                 :   static bool registered;
      76               0 :   if (!registered) {
      77               0 :     NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemAllocated));
      78               0 :     NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemMapped));
      79               0 :     registered = true;
      80                 :   }
      81               0 : }
      82                 : 
      83                 : /*static*/ size_t
      84               0 : SharedMemory::PageAlignedSize(size_t aSize)
      85                 : {
      86               0 :   size_t pageSize = SystemPageSize();
      87               0 :   size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize)));
      88               0 :   return pageSize * nPagesNeeded;
      89                 : }
      90                 : 
      91                 : void
      92               0 : SharedMemory::Created(size_t aNBytes)
      93                 : {
      94               0 :   mAllocSize = aNBytes;
      95               0 :   gShmemAllocated += mAllocSize;
      96               0 : }
      97                 : 
      98                 : void
      99               0 : SharedMemory::Mapped(size_t aNBytes)
     100                 : {
     101               0 :   mMappedSize = aNBytes;
     102               0 :   gShmemMapped += mMappedSize;
     103               0 : }
     104                 : 
     105                 : void
     106               0 : SharedMemory::Unmapped()
     107                 : {
     108               0 :   NS_ABORT_IF_FALSE(gShmemMapped >= PRInt64(mMappedSize),
     109                 :                     "Can't unmap more than mapped");
     110               0 :   gShmemMapped -= mMappedSize;
     111               0 :   mMappedSize = 0;
     112               0 : }
     113                 : 
     114                 : /*static*/ void
     115               0 : SharedMemory::Destroyed()
     116                 : {
     117               0 :   NS_ABORT_IF_FALSE(gShmemAllocated >= PRInt64(mAllocSize),
     118                 :                     "Can't destroy more than allocated");
     119               0 :   gShmemAllocated -= mAllocSize;
     120               0 :   mAllocSize = 0;
     121               0 : }
     122                 : 
     123                 : } // namespace ipc
     124                 : } // namespace mozilla

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