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Side by Side Diff: base/shared_memory.h

Issue 10895: Add Terminate() to the Process object, have RenderProcessHost use this to avo... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 12 years, 1 month ago
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 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 BASE_SHARED_MEMORY_H_ 5 #ifndef BASE_SHARED_MEMORY_H_
6 #define BASE_SHARED_MEMORY_H_ 6 #define BASE_SHARED_MEMORY_H_
7 7
8 #include <string> 8 #include <string>
9 #include "base/basictypes.h" 9 #include "base/basictypes.h"
10 #include "base/process.h" 10 #include "base/process.h"
11 11
12 namespace base {
13
12 // SharedMemoryHandle is a platform specific type which represents 14 // SharedMemoryHandle is a platform specific type which represents
13 // the underlying OS handle to a shared memory segment. 15 // the underlying OS handle to a shared memory segment.
14 #if defined(OS_WIN) 16 #if defined(OS_WIN)
15 typedef HANDLE SharedMemoryHandle; 17 typedef HANDLE SharedMemoryHandle;
16 typedef HANDLE SharedMemoryLock; 18 typedef HANDLE SharedMemoryLock;
17 #elif defined(OS_POSIX) 19 #elif defined(OS_POSIX)
18 #include <semaphore.h> 20 #include <semaphore.h>
19 typedef int SharedMemoryHandle; 21 typedef int SharedMemoryHandle;
20 typedef sem_t* SharedMemoryLock; 22 typedef sem_t* SharedMemoryLock;
21 #endif 23 #endif
22 24
23 // Platform abstraction for shared memory. Provides a C++ wrapper 25 // Platform abstraction for shared memory. Provides a C++ wrapper
24 // around the OS primitive for a memory mapped file. 26 // around the OS primitive for a memory mapped file.
25 class SharedMemory { 27 class SharedMemory {
26 public: 28 public:
27 // Create a new SharedMemory object. 29 // Create a new SharedMemory object.
28 SharedMemory(); 30 SharedMemory();
29 31
30 // Create a new SharedMemory object from an existing, open 32 // Create a new SharedMemory object from an existing, open
31 // shared memory file. 33 // shared memory file.
32 SharedMemory(SharedMemoryHandle handle, bool read_only); 34 SharedMemory(SharedMemoryHandle handle, bool read_only);
33 35
34 // Create a new SharedMemory object from an existing, open 36 // Create a new SharedMemory object from an existing, open
35 // shared memory file that was created by a remote process and not shared 37 // shared memory file that was created by a remote process and not shared
36 // to the current process. 38 // to the current process.
37 SharedMemory(SharedMemoryHandle handle, bool read_only, 39 SharedMemory(SharedMemoryHandle handle, bool read_only,
38 ProcessHandle process); 40 base::ProcessHandle process);
39 41
40 // Destructor. Will close any open files. 42 // Destructor. Will close any open files.
41 ~SharedMemory(); 43 ~SharedMemory();
42 44
43 // Creates or opens a shared memory segment based on a name. 45 // Creates or opens a shared memory segment based on a name.
44 // If read_only is true, opens the memory as read-only. 46 // If read_only is true, opens the memory as read-only.
45 // If open_existing is true, and the shared memory already exists, 47 // If open_existing is true, and the shared memory already exists,
46 // opens the existing shared memory and ignores the size parameter. 48 // opens the existing shared memory and ignores the size parameter.
47 // Returns true on success, false on failure. 49 // Returns true on success, false on failure.
48 bool Create(const std::wstring& name, bool read_only, bool open_existing, 50 bool Create(const std::wstring& name, bool read_only, bool open_existing,
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82 // Closes the open shared memory segment. 84 // Closes the open shared memory segment.
83 // It is safe to call Close repeatedly. 85 // It is safe to call Close repeatedly.
84 void Close(); 86 void Close();
85 87
86 // Share the shared memory to another process. Attempts 88 // Share the shared memory to another process. Attempts
87 // to create a platform-specific new_handle which can be 89 // to create a platform-specific new_handle which can be
88 // used in a remote process to access the shared memory 90 // used in a remote process to access the shared memory
89 // file. new_handle is an ouput parameter to receive 91 // file. new_handle is an ouput parameter to receive
90 // the handle for use in the remote process. 92 // the handle for use in the remote process.
91 // Returns true on success, false otherwise. 93 // Returns true on success, false otherwise.
92 bool ShareToProcess(ProcessHandle process, 94 bool ShareToProcess(base::ProcessHandle process,
93 SharedMemoryHandle* new_handle) { 95 SharedMemoryHandle* new_handle) {
94 return ShareToProcessCommon(process, new_handle, false); 96 return ShareToProcessCommon(process, new_handle, false);
95 } 97 }
96 98
97 // Logically equivalent to: 99 // Logically equivalent to:
98 // bool ok = ShareToProcess(process, new_handle); 100 // bool ok = ShareToProcess(process, new_handle);
99 // Close(); 101 // Close();
100 // return ok; 102 // return ok;
101 bool GiveToProcess(ProcessHandle process, 103 bool GiveToProcess(ProcessHandle process,
102 SharedMemoryHandle* new_handle) { 104 SharedMemoryHandle* new_handle) {
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140 142
141 ~SharedMemoryAutoLock() { 143 ~SharedMemoryAutoLock() {
142 shared_memory_->Unlock(); 144 shared_memory_->Unlock();
143 } 145 }
144 146
145 private: 147 private:
146 SharedMemory* shared_memory_; 148 SharedMemory* shared_memory_;
147 DISALLOW_EVIL_CONSTRUCTORS(SharedMemoryAutoLock); 149 DISALLOW_EVIL_CONSTRUCTORS(SharedMemoryAutoLock);
148 }; 150 };
149 151
152 } // namespace base
150 153
151 #endif // BASE_SHARED_MEMORY_H_ 154 #endif // BASE_SHARED_MEMORY_H_
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