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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_RENDERER_RENDER_PROCESS_H__
#define CHROME_RENDERER_RENDER_PROCESS_H__
#include <objidl.h>
#include <mlang.h>
#include "base/shared_memory.h"
#include "chrome/common/child_process.h"
#include "chrome/renderer/render_thread.h"
class RenderView;
// Represents the renderer end of the browser<->renderer connection. The
// opposite end is the RenderProcessHost. This is a singleton object for
// each renderer.
class RenderProcess : public ChildProcess {
public:
static bool GlobalInit(const std::wstring& channel_name);
static void GlobalCleanup();
// Returns true if plugins should be loaded in-process.
static bool ShouldLoadPluginsInProcess();
static IMLangFontLink2* GetLangFontLink();
// Allocates shared memory. When no longer needed, you should pass the
// SharedMemory pointer to FreeSharedMemory so it can be recycled. The size
// reported in the resulting SharedMemory object will be greater than or
// equal to the requested size. This method returns NULL if unable to
// allocate memory for some reason.
static SharedMemory* AllocSharedMemory(size_t size);
// Frees shared memory allocated by AllocSharedMemory. You should only use
// this function to free the SharedMemory object.
static void FreeSharedMemory(SharedMemory* mem);
private:
friend class ChildProcessFactory<RenderProcess>;
RenderProcess(const std::wstring& channel_name);
~RenderProcess();
// Initializes the LangFontLink object. This function cannot be called
// while the process is restricted by the sandbox or it will fail.
static void InitializeLangFontLink();
// Releases the LangFontLink object if already created.
static void ReleaseLangFontLink();
// Returns a pointer to the RenderProcess singleton instance. This is
// guaranteed to be non-NULL between calls to GlobalInit and GlobalCleanup.
static RenderProcess* self() {
return static_cast<RenderProcess*>(child_process_);
}
static ChildProcess* ClassFactory(const std::wstring& channel_name);
// This is here so consumers will use FreeSharedMemory instead. A destructor
// on SharedMemory would be too tempting.
static void DeleteSharedMem(SharedMemory* mem);
// Look in the shared memory cache for a suitable object to reuse. Returns
// NULL if there is none.
SharedMemory* GetSharedMemFromCache(size_t size);
// Maybe put the given shared memory into the shared memory cache. Returns
// true if the SharedMemory object was stored in the cache; otherwise, false
// is returned.
bool PutSharedMemInCache(SharedMemory* mem);
void ClearSharedMemCache();
// We want to lazily clear the shared memory cache if no one has requested
// memory. This methods are used to schedule a deferred call to
// RenderProcess::ClearSharedMemCache.
void ScheduleCacheClearer();
// ChildProcess implementation
virtual void Cleanup();
// The one render thread (to be replaced with a set of render threads).
RenderThread render_thread_;
// A very simplistic and small cache. If an entry in this array is non-null,
// then it points to a SharedMemory object that is available for reuse.
SharedMemory* shared_mem_cache_[2];
// This factory is used to lazily invoke ClearSharedMemCache.
ScopedRunnableMethodFactory<RenderProcess> clearer_factory_;
static IMLangFontLink2* lang_font_link_;
static bool load_plugins_in_process_;
DISALLOW_EVIL_CONSTRUCTORS(RenderProcess);
};
#endif // CHROME_RENDERER_RENDER_PROCESS_H__
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