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// 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.
#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();
// 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 base::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(base::SharedMemory* mem);
// Deletes the shared memory allocated by AllocSharedMemory.
static void DeleteSharedMem(base::SharedMemory* mem);
private:
friend class ChildProcessFactory<RenderProcess>;
RenderProcess(const std::wstring& channel_name);
~RenderProcess();
// 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);
// Look in the shared memory cache for a suitable object to reuse. Returns
// NULL if there is none.
base::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(base::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.
base::SharedMemory* shared_mem_cache_[2];
// This factory is used to lazily invoke ClearSharedMemCache.
ScopedRunnableMethodFactory<RenderProcess> clearer_factory_;
static bool load_plugins_in_process_;
DISALLOW_EVIL_CONSTRUCTORS(RenderProcess);
};
#endif // CHROME_RENDERER_RENDER_PROCESS_H__
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