1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_MEMORY_HEAP_PMEM_H
18#define ANDROID_MEMORY_HEAP_PMEM_H
19
20#include <stdlib.h>
21#include <stdint.h>
22
23#include <binder/MemoryHeapBase.h>
24#include <binder/IMemory.h>
25#include <utils/SortedVector.h>
26#include <utils/threads.h>
27
28namespace android {
29
30class MemoryHeapBase;
31
32// ---------------------------------------------------------------------------
33
34class MemoryHeapPmem : public MemoryHeapBase
35{
36public:
37    class MemoryPmem : public BnMemory {
38    public:
39        MemoryPmem(const sp<MemoryHeapPmem>& heap);
40        ~MemoryPmem();
41    protected:
42        const sp<MemoryHeapPmem>&  getHeap() const { return mClientHeap; }
43    private:
44        friend class MemoryHeapPmem;
45        virtual void revoke() = 0;
46        sp<MemoryHeapPmem>  mClientHeap;
47    };
48
49    MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap, uint32_t flags = 0);
50    ~MemoryHeapPmem();
51
52    /* HeapInterface additions */
53    virtual sp<IMemory> mapMemory(size_t offset, size_t size);
54
55    /* make the whole heap visible (you know who you are) */
56    virtual status_t slap();
57
58    /* hide (revoke) the whole heap (the client will see the garbage page) */
59    virtual status_t unslap();
60
61    /* revoke all allocations made by this heap */
62    virtual void revoke();
63
64private:
65    /* use this to create your own IMemory for mapMemory */
66    virtual sp<MemoryPmem> createMemory(size_t offset, size_t size);
67    void remove(const wp<MemoryPmem>& memory);
68
69private:
70    sp<MemoryHeapBase>              mParentHeap;
71    mutable Mutex                   mLock;
72    SortedVector< wp<MemoryPmem> >  mAllocations;
73};
74
75
76// ---------------------------------------------------------------------------
77}; // namespace android
78
79#endif // ANDROID_MEMORY_HEAP_PMEM_H
80