Update //base to chromium 9659b08ea5a34f889dc4166217f438095ddc10d2

base/memory/shared_memory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MEMORY_SHARED_MEMORY_H_
 #define BASE_MEMORY_SHARED_MEMORY_H_
 
 #include "build/build_config.h"
 
 #include <string>
 
 #if defined(OS_POSIX)
 #include <stdio.h>
 #include <sys/types.h>
 #include <semaphore.h>
 #endif
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/memory/shared_memory_handle.h"
 #include "base/process/process_handle.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #endif
 
 namespace base {
 
 class FilePath;
 
-// SharedMemoryHandle is a platform specific type which represents
-// the underlying OS handle to a shared memory segment.
-#if defined(OS_WIN)
-typedef HANDLE SharedMemoryHandle;
-#elif defined(OS_POSIX)
-typedef FileDescriptor SharedMemoryHandle;
-#endif
-
 // Options for creating a shared memory object.
 struct SharedMemoryCreateOptions {
   SharedMemoryCreateOptions()
       : name_deprecated(NULL),
         size(0),
         open_existing_deprecated(false),
         executable(false),
         share_read_only(false) {}
 
   // DEPRECATED (crbug.com/345734):
@@ skipping 32 matching lines @@
   explicit SharedMemory(const std::wstring& name);
 #endif
 
   // Create a new SharedMemory object from an existing, open
   // shared memory file.
   //
   // WARNING: This does not reduce the OS-level permissions on the handle; it
   // only affects how the SharedMemory will be mmapped.  Use
   // ShareReadOnlyToProcess to drop permissions.  TODO(jln,jyasskin): DCHECK
   // that |read_only| matches the permissions of the handle.
-  SharedMemory(SharedMemoryHandle handle, bool read_only);
+  SharedMemory(const SharedMemoryHandle& handle, bool read_only);
 
   // Create a new SharedMemory object from an existing, open
   // shared memory file that was created by a remote process and not shared
   // to the current process.
-  SharedMemory(SharedMemoryHandle handle, bool read_only,
+  SharedMemory(const SharedMemoryHandle& handle,
+               bool read_only,
                ProcessHandle process);
 
   // Closes any open files.
   ~SharedMemory();
 
   // Return true iff the given handle is valid (i.e. not the distingished
   // invalid value; NULL for a HANDLE and -1 for a file descriptor)
   static bool IsHandleValid(const SharedMemoryHandle& handle);
 
   // Returns invalid handle (see comment above for exact definition).
@@ skipping 142 matching lines @@
   //   bool ok = ShareToProcess(process, new_handle);
   //   Close();
   //   return ok;
   // Note that the memory is unmapped by calling this method, regardless of the
   // return value.
   bool GiveToProcess(ProcessHandle process,
                      SharedMemoryHandle* new_handle) {
     return ShareToProcessCommon(process, new_handle, true, SHARE_CURRENT_MODE);
   }
 
-  // DEPRECATED (crbug.com/345734):
-  // Locks the shared memory.
-  //
-  // WARNING: on POSIX the memory locking primitive only works across
-  // processes, not across threads.  The LockDeprecated method is not currently
-  // used in inner loops, so we protect against multiple threads in a
-  // critical section using a class global lock.
-  void LockDeprecated();
-
-  // DEPRECATED (crbug.com/345734):
-  // Releases the shared memory lock.
-  void UnlockDeprecated();
-
  private:
-#if defined(OS_POSIX) && !defined(OS_NACL)
-#if !defined(OS_ANDROID)
+#if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID)
   bool PrepareMapFile(ScopedFILE fp, ScopedFD readonly);
   bool FilePathForMemoryName(const std::string& mem_name, FilePath* path);
-#endif
-  void LockOrUnlockCommon(int function);
-#endif  // defined(OS_POSIX) && !defined(OS_NACL)
+#endif  // defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID)
   enum ShareMode {
     SHARE_READONLY,
     SHARE_CURRENT_MODE,
   };
   bool ShareToProcessCommon(ProcessHandle process,
                             SharedMemoryHandle* new_handle,
                             bool close_self,
                             ShareMode);
 
 #if defined(OS_WIN)
   std::wstring       name_;
   HANDLE             mapped_file_;
 #elif defined(OS_POSIX)
   int                mapped_file_;
   int                readonly_mapped_file_;
 #endif
   size_t             mapped_size_;
   void*              memory_;
   bool               read_only_;
   size_t             requested_size_;
-#if !defined(OS_POSIX)
-  HANDLE             lock_;
-#endif
 
   DISALLOW_COPY_AND_ASSIGN(SharedMemory);
 };
-
-// DEPRECATED (crbug.com/345734):
-// A helper class that acquires the shared memory lock while
-// the SharedMemoryAutoLockDeprecated is in scope.
-class SharedMemoryAutoLockDeprecated {
- public:
-  explicit SharedMemoryAutoLockDeprecated(SharedMemory* shared_memory)
-      : shared_memory_(shared_memory) {
-    shared_memory_->LockDeprecated();
-  }
-
-  ~SharedMemoryAutoLockDeprecated() {
-    shared_memory_->UnlockDeprecated();
-  }
-
- private:
-  SharedMemory* shared_memory_;
-  DISALLOW_COPY_AND_ASSIGN(SharedMemoryAutoLockDeprecated);
-};
-
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_H_