Implemented shared memory as an NPObject.

o3d/gpu_plugin/system_services/shared_memory.cc

Index: o3d/gpu_plugin/system_services/shared_memory.cc
===================================================================
--- o3d/gpu_plugin/system_services/shared_memory.cc	(revision 0)
+++ o3d/gpu_plugin/system_services/shared_memory.cc	(revision 0)
@@ -0,0 +1,65 @@
+// Copyright (c) 2006-2008 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 "o3d/gpu_plugin/system_services/shared_memory.h"
+
+namespace o3d {
+namespace gpu_plugin {
+
+SharedMemory::SharedMemory(NPP npp)
+    : npp_(npp),
+      shared_memory_(NULL) {

[Ken Russell (Google), 2009/09/09 01:32:54]

Where are the NPObject fields (_class and referenceCount) of the superclass
CHRSharedMemory initialized? Is this area still a work in progress?

[apatrick, 2009/09/09 02:10:18]

Shared memory objects are created through NPN_CreateObject (or
WebKit::WebBindings::createObject), which initializes those fields.

+  handle = NULL;
+  ptr = NULL;
+  size = 0;
+}
+
+SharedMemory::~SharedMemory() {
+  if (shared_memory_) {
+    delete shared_memory_;
+  }
+}
+
+void SharedMemory::Initialize(base::SharedMemory* shared_memory, int32 size) {
+  DCHECK(shared_memory);
+  shared_memory_ = shared_memory;
+  this->handle = shared_memory->handle();
+  this->size = size;
+}
+
+bool SharedMemory::Initialize(int32 size) {
+  if (size < 0)
+    return false;
+
+  if (shared_memory_)
+    return false;
+
+  shared_memory_ = new base::SharedMemory();
+  if (!shared_memory_->Create(std::wstring(), false, false, size)) {
+    delete shared_memory_;
+    shared_memory_ = NULL;
+    return false;
+  }
+
+  handle = shared_memory_->handle();
+  this->size = size;
+  return true;
+}
+
+bool SharedMemory::Map() {
+  if (!shared_memory_)
+    return false;
+
+  if (!shared_memory_->memory()) {
+    if (!shared_memory_->Map(shared_memory_->max_size()))
+      return false;
+
+    ptr = shared_memory_->memory();
+  }
+
+  return true;
+}
+
+}  // namespace gpu_plugin
+}  // namespace o3d