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 IPC.
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 : *
26 : * Alternatively, the contents of this file may be used under the terms of
27 : * either the GNU General Public License Version 2 or later (the "GPL"), or
28 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 : * in which case the provisions of the GPL or the LGPL are applicable instead
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35 : * the provisions above, a recipient may use your version of this file under
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37 : *
38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : #ifndef mozilla_ipc_SharedMemoryBasic_chromium_h
41 : #define mozilla_ipc_SharedMemoryBasic_chromium_h
42 :
43 : #include "base/shared_memory.h"
44 : #include "SharedMemory.h"
45 :
46 : #include "nsDebug.h"
47 :
48 : //
49 : // This is a low-level wrapper around platform shared memory. Don't
50 : // use it directly; use Shmem allocated through IPDL interfaces.
51 : //
52 :
53 : namespace mozilla {
54 : namespace ipc {
55 :
56 : class SharedMemoryBasic : public SharedMemory
57 0 : {
58 : public:
59 : typedef base::SharedMemoryHandle Handle;
60 :
61 0 : SharedMemoryBasic()
62 0 : {
63 0 : }
64 :
65 0 : SharedMemoryBasic(const Handle& aHandle)
66 0 : : mSharedMemory(aHandle, false)
67 : {
68 0 : }
69 :
70 : NS_OVERRIDE
71 0 : virtual bool Create(size_t aNbytes)
72 : {
73 0 : bool ok = mSharedMemory.Create("", false, false, aNbytes);
74 0 : if (ok) {
75 0 : Created(aNbytes);
76 : }
77 0 : return ok;
78 : }
79 :
80 : NS_OVERRIDE
81 0 : virtual bool Map(size_t nBytes)
82 : {
83 0 : bool ok = mSharedMemory.Map(nBytes);
84 0 : if (ok) {
85 0 : Mapped(nBytes);
86 : }
87 0 : return ok;
88 : }
89 :
90 : NS_OVERRIDE
91 0 : virtual void* memory() const
92 : {
93 0 : return mSharedMemory.memory();
94 : }
95 :
96 : NS_OVERRIDE
97 0 : virtual SharedMemoryType Type() const
98 : {
99 0 : return TYPE_BASIC;
100 : }
101 :
102 0 : static Handle NULLHandle()
103 : {
104 0 : return base::SharedMemory::NULLHandle();
105 : }
106 :
107 0 : static bool IsHandleValid(const Handle &aHandle)
108 : {
109 0 : return base::SharedMemory::IsHandleValid(aHandle);
110 : }
111 :
112 0 : bool ShareToProcess(base::ProcessHandle process,
113 : Handle* new_handle)
114 : {
115 0 : base::SharedMemoryHandle handle;
116 0 : bool ret = mSharedMemory.ShareToProcess(process, &handle);
117 0 : if (ret)
118 0 : *new_handle = handle;
119 0 : return ret;
120 : }
121 :
122 : private:
123 : base::SharedMemory mSharedMemory;
124 : };
125 :
126 : } // namespace ipc
127 : } // namespace mozilla
128 :
129 :
130 : #endif // ifndef mozilla_ipc_SharedMemoryBasic_chromium_h
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