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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "base/shared_memory.h" | |
6 | |
7 #include <sys/mman.h> | |
8 | |
9 #include "base/logging.h" | |
10 #include "third_party/ashmem/ashmem.h" | |
11 | |
12 namespace base { | |
13 | |
14 // For Android, we use ashmem to implement SharedMemory. ashmem_create_region | |
15 // will automatically pin the region. We never explicitly call pin/unpin. When | |
16 // all the file descriptors from different processes associated with the region | |
17 // are closed, the memory buffer will go away. | |
18 | |
19 bool SharedMemory::CreateNamed(const std::string& name, | |
20 bool open_existing, uint32 size) { | |
21 DCHECK_EQ(-1, mapped_file_ ); | |
22 | |
23 // "name" is just a label in ashmem. It is visible in /proc/pid/maps. | |
24 mapped_file_ = ashmem_create_region(name.c_str(), size); | |
25 if (-1 == mapped_file_) { | |
26 DLOG(ERROR) << "Shared memory creation failed"; | |
27 return false; | |
28 } | |
29 | |
30 int err = ashmem_set_prot_region(mapped_file_, | |
31 PROT_READ | PROT_WRITE | PROT_EXEC); | |
32 if (err < 0) { | |
33 DLOG(ERROR) << "Error " << err << " when setting protection of ashmem"; | |
34 return false; | |
35 } | |
36 created_size_ = size; | |
37 | |
38 return true; | |
39 } | |
40 | |
41 bool SharedMemory::Delete(const std::string& name) { | |
42 // ashmem doesn't support name mapping | |
43 NOTIMPLEMENTED(); | |
44 return false; | |
45 } | |
46 | |
47 bool SharedMemory::Open(const std::string& name, bool read_only) { | |
48 // ashmem doesn't support name mapping | |
49 NOTIMPLEMENTED(); | |
50 return false; | |
51 } | |
52 | |
53 int SharedMemory::GetAshmenSizeRegion() { | |
54 return ashmem_get_size_region(mapped_file_); | |
55 } | |
56 } // namespace base | |
brettw
2011/06/20 03:50:40
Nit: extra blank line before this.
michaelbai
2011/06/20 22:50:36
Done.
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