Index: base/shared_memory_android.cc |
diff --git a/base/shared_memory_android.cc b/base/shared_memory_android.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c2f33159f0730ec41f41808062b0ece50a4d7fc9 |
--- /dev/null |
+++ b/base/shared_memory_android.cc |
@@ -0,0 +1,53 @@ |
+// Copyright (c) 2011 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. |
+ |
+#include "base/shared_memory.h" |
+ |
+#include <sys/mman.h> |
+ |
+#include "base/logging.h" |
+#include "third_party/ashmem/ashmem.h" |
+ |
+namespace base { |
+ |
+// For Android, we use ashmem to implement SharedMemory. ashmem_create_region |
+// will automatically pin the region. We never explicitly call pin/unpin. When |
+// all the file descriptors from different processes associated with the region |
+// are closed, the memory buffer will go away. |
+ |
+bool SharedMemory::CreateNamed(const std::string& name, |
+ bool open_existing, uint32 size) { |
+ DCHECK_EQ(-1, mapped_file_ ); |
+ |
+ // "name" is just a label in ashmem. It is visible in /proc/pid/maps. |
+ mapped_file_ = ashmem_create_region(name.c_str(), size); |
+ if (-1 == mapped_file_) { |
+ DLOG(ERROR) << "Shared memory creation failed"; |
+ return false; |
+ } |
+ |
+ int err = ashmem_set_prot_region(mapped_file_, |
+ PROT_READ | PROT_WRITE | PROT_EXEC); |
+ if (err < 0) { |
+ DLOG(ERROR) << "Error " << err << " when setting protection of ashmem"; |
+ return false; |
+ } |
+ created_size_ = size; |
+ |
+ return true; |
+} |
+ |
+bool SharedMemory::Delete(const std::string& name) { |
+ // ashmem doesn't support name mapping |
+ NOTIMPLEMENTED(); |
+ return false; |
+} |
+ |
+bool SharedMemory::Open(const std::string& name, bool read_only) { |
+ // ashmem doesn't support name mapping |
+ NOTIMPLEMENTED(); |
+ return false; |
+} |
+ |
+} // namespace base |