PPAPI: Implement PPB_FileMapping on POSIX

ppapi/proxy/file_mapping_resource.h

+// Copyright (c) 2014 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 PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_
+#define PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_
+
+#include "ppapi/proxy/file_io_resource.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/thunk/ppb_file_mapping_api.h"
+
+namespace ppapi {
+namespace proxy {
+
+// The proxy-side resource for PPB_FileMapping.
+class PPAPI_PROXY_EXPORT FileMappingResource
+      : public PluginResource,
+        public thunk::PPB_FileMapping_API {
+ public:
+  FileMappingResource(Connection connection, PP_Instance instance);
+
+ private:
+  virtual ~FileMappingResource();
+
+  // Resource implementation.
+  virtual thunk::PPB_FileMapping_API* AsPPB_FileMapping_API() OVERRIDE;
+
+  // PPB_FileMapping_API implementation.
+  virtual int32_t Map(PP_Instance instance,
+                      PP_Resource file_io,
+                      int64_t length,
+                      uint32_t map_protection,
+                      uint32_t map_flags,

[bbudge, 2014/01/27 18:56:44]

nit: These could be named 'protection' and 'flags'. Any reason why you prepended
map_, since the function name provides that context?

+                      int64_t offset,
+                      void** address,
+                      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Unmap(PP_Instance instance,
+                        const void* address,
+                        int64_t length,
+                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int64_t GetMapPageSize(PP_Instance instance) OVERRIDE;
+
+  struct MapResult {
+    MapResult() : result(PP_ERROR_FAILED), address(NULL) {
+    }
+    int32_t result;
+    void* address;
+  };
+  void OnMapCompleted(void** mapped_address_out_param,
+                      int64_t length,
+                      scoped_refptr<TrackedCallback> callback,
+                      const MapResult& map_result);
+
+  // These functions perform potentially blocking operations so they should not
+  // be called on the main thread or while we hold the proxy lock. Their
+  // implementation is platform specific. See file_mapping_resource_posix.cc and
+  // file_mapping_resource_win.cc.
+  static MapResult DoMapBlocking(
+      scoped_refptr<FileIOResource::FileHandleHolder> handle,
+      void* address_hint,
+      int64_t length,
+      uint32_t map_protection,
+      uint32_t map_flags,
+      int64_t offset);
+  static int32_t DoUnmapBlocking(const void* address, int64_t length);
+  // DoGetMapPageSize is platform-specific, but fast enough that we can call it
+  // on the main thread with the lock.
+  static int64_t DoGetMapPageSize();
+
+  DISALLOW_COPY_AND_ASSIGN(FileMappingResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_