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Side by Side Diff: remoting/base/shared_buffer.h

Issue 11413022: DesktopSessionAgent now hosts the video capturer and provides necessary plumbing to drive it via an… (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: fixing clang compilation. Created 8 years ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef REMOTING_BASE_SHARED_BUFFER_H_ 5 #ifndef REMOTING_BASE_SHARED_BUFFER_H_
6 #define REMOTING_BASE_SHARED_BUFFER_H_ 6 #define REMOTING_BASE_SHARED_BUFFER_H_
7 7
8 #include "base/basictypes.h" 8 #include "base/basictypes.h"
9 #include "base/memory/ref_counted.h" 9 #include "base/memory/ref_counted.h"
10 #include "base/process.h" 10 #include "base/process.h"
11 #include "base/shared_memory.h" 11 #include "base/shared_memory.h"
12 12
13 namespace remoting { 13 namespace remoting {
14 14
15 // Represents a memory buffer that can be shared between multiple processes. 15 // Represents a memory buffer that can be shared between multiple processes.
16 // It is more or less a convenience wrapper around base::SharedMemory providing 16 // It is more or less a convenience wrapper around base::SharedMemory providing
17 // ref-counted lifetime management and unique buffer identifiers. 17 // ref-counted lifetime management and unique buffer identifiers.
18 class SharedBuffer 18 class SharedBuffer
19 : public base::RefCountedThreadSafe<SharedBuffer> { 19 : public base::RefCountedThreadSafe<SharedBuffer> {
20 public: 20 public:
21 // Creates a new shared memory buffer of the given size and maps it to 21 // Creates a new shared memory buffer of the given size and maps it to
22 // the memory of the calling process. If the operation fails for any reason, 22 // the memory of the calling process. If the operation fails for any reason,
23 // ptr() method will return NULL. This constructor set the identifier of this 23 // ptr() method will return NULL. This constructor set the identifier of this
24 // buffer to 0. 24 // buffer to 0.
25 explicit SharedBuffer(uint32 size); 25 explicit SharedBuffer(uint32 size);
26 26
27 // Opens an existing shared memory buffer and maps it to the memory of 27 // Opens an existing shared memory buffer and maps it to the memory of
28 // the calling process (in read only mode). If the operation fails for any 28 // the calling process (in read only mode). If the operation fails for any
29 // reason, ptr() method will return NULL. 29 // reason, ptr() method will return NULL.
30 SharedBuffer(intptr_t id, base::SharedMemoryHandle handle, uint32 size); 30 SharedBuffer(int id, base::SharedMemoryHandle handle, uint32 size);
31 31
32 // Opens an existing shared memory buffer created by a different process and 32 // Opens an existing shared memory buffer created by a different process and
33 // maps it to the memory of the calling process (in read only mode). If 33 // maps it to the memory of the calling process (in read only mode). If
34 // the operation fails for any reason, ptr() method will return NULL. 34 // the operation fails for any reason, ptr() method will return NULL.
35 SharedBuffer(intptr_t id, base::SharedMemoryHandle handle, 35 SharedBuffer(int id, base::SharedMemoryHandle handle,
36 base::ProcessHandle process, uint32 size); 36 base::ProcessHandle process, uint32 size);
37 37
38 // Returns pointer to the beginning of the allocated data buffer. Returns NULL 38 // Returns pointer to the beginning of the allocated data buffer. Returns NULL
39 // if the object initialization failed for any reason. 39 // if the object initialization failed for any reason.
40 void* ptr() const { return shared_memory_.memory(); } 40 void* ptr() const { return shared_memory_.memory(); }
41 41
42 // Returns handle of the shared memory section containing the allocated 42 // Returns handle of the shared memory section containing the allocated
43 // data buffer. 43 // data buffer.
44 base::SharedMemoryHandle handle() const { return shared_memory_.handle(); } 44 base::SharedMemoryHandle handle() const { return shared_memory_.handle(); }
45 45
46 intptr_t id() const { return id_; } 46 int id() const { return id_; }
47 uint32 size() const { return size_; } 47 uint32 size() const { return size_; }
48 48
49 void set_id(intptr_t id) { id_ = id; } 49 void set_id(int id) { id_ = id; }
50 50
51 private: 51 private:
52 friend class base::RefCountedThreadSafe<SharedBuffer>; 52 friend class base::RefCountedThreadSafe<SharedBuffer>;
53 virtual ~SharedBuffer(); 53 virtual ~SharedBuffer();
54 54
55 // Unique identifier of the buffer or 0 if ID hasn't been set. 55 // Unique identifier of the buffer or 0 if ID hasn't been set.
56 intptr_t id_; 56 int id_;
57 57
58 // Shared memory section backing up the buffer. 58 // Shared memory section backing up the buffer.
59 base::SharedMemory shared_memory_; 59 base::SharedMemory shared_memory_;
60 60
61 // Size of the buffer in bytes. 61 // Size of the buffer in bytes.
62 uint32 size_; 62 uint32 size_;
63 63
64 DISALLOW_COPY_AND_ASSIGN(SharedBuffer); 64 DISALLOW_COPY_AND_ASSIGN(SharedBuffer);
65 }; 65 };
66 66
67 } // namespace remoting 67 } // namespace remoting
68 68
69 #endif // REMOTING_BASE_SHARED_BUFFER_H_ 69 #endif // REMOTING_BASE_SHARED_BUFFER_H_
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