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// Copyright 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 CONTENT_CHILD_CHILD_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
#define CONTENT_CHILD_CHILD_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
#include "base/memory/discardable_memory_allocator.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/trace_event/memory_dump_provider.h"
#include "content/child/thread_safe_sender.h"
#include "content/common/content_export.h"
#include "content/common/discardable_shared_memory_heap.h"
#include "content/common/host_discardable_shared_memory_manager.h"
namespace content {
// Implementation of DiscardableMemoryAllocator that allocates
// discardable memory segments through the browser process.
class CONTENT_EXPORT ChildDiscardableSharedMemoryManager
: public base::DiscardableMemoryAllocator,
public base::trace_event::MemoryDumpProvider {
public:
explicit ChildDiscardableSharedMemoryManager(ThreadSafeSender* sender);
~ChildDiscardableSharedMemoryManager() override;
// Overridden from base::DiscardableMemoryAllocator:
scoped_ptr<base::DiscardableMemory> AllocateLockedDiscardableMemory(
size_t size) override;
// Overridden from base::trace_event::MemoryDumpProvider:
bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* pmd) override;
// Release memory and associated resources that have been purged.
void ReleaseFreeMemory();
bool LockSpan(DiscardableSharedMemoryHeap::Span* span);
void UnlockSpan(DiscardableSharedMemoryHeap::Span* span);
void ReleaseSpan(scoped_ptr<DiscardableSharedMemoryHeap::Span> span);
private:
scoped_ptr<base::DiscardableSharedMemory>
AllocateLockedDiscardableSharedMemory(size_t size,
DiscardableSharedMemoryId id);
void MemoryUsageChanged(size_t new_bytes_allocated,
size_t new_bytes_free) const;
mutable base::Lock lock_;
DiscardableSharedMemoryHeap heap_;
scoped_refptr<ThreadSafeSender> sender_;
DISALLOW_COPY_AND_ASSIGN(ChildDiscardableSharedMemoryManager);
};
} // namespace content
#endif // CONTENT_CHILD_CHILD_DISCARDABLE_SHARED_MEMORY_MANAGER_H_