#include <sys/types.h>
#include <binder/IMemory.h>
-#include <utils/threads.h>
#include <binder/MemoryHeapBase.h>
namespace android {
// ----------------------------------------------------------------------------
-class String8;
-/*
- * interface for implementing a "heap". A heap basically provides
- * the IMemoryHeap interface for cross-process sharing and the
- * ability to map/unmap pages within the heap.
- */
-class HeapInterface : public virtual BnMemoryHeap
-{
-public:
- // all values must be page-aligned
- virtual sp<IMemory> mapMemory(size_t offset, size_t size) = 0;
-
- HeapInterface();
-protected:
- virtual ~HeapInterface();
-};
-
-// ----------------------------------------------------------------------------
-
-/*
- * interface for implementing an allocator. An allocator provides
- * methods for allocating and freeing memory blocks and dumping
- * its state.
- */
-class AllocatorInterface : public RefBase
-{
-public:
- enum {
- PAGE_ALIGNED = 0x00000001
- };
-
- virtual size_t allocate(size_t size, uint32_t flags = 0) = 0;
- virtual status_t deallocate(size_t offset) = 0;
- virtual size_t size() const = 0;
- virtual void dump(const char* what, uint32_t flags = 0) const = 0;
- virtual void dump(String8& res,
- const char* what, uint32_t flags = 0) const = 0;
-
- AllocatorInterface();
-protected:
- virtual ~AllocatorInterface();
-};
-
-// ----------------------------------------------------------------------------
-
-/*
- * concrete implementation of HeapInterface on top of mmap()
- */
-class SharedHeap : public HeapInterface, public MemoryHeapBase
-{
-public:
- SharedHeap();
- SharedHeap(size_t size, uint32_t flags = 0, char const * name = NULL);
- virtual ~SharedHeap();
- virtual sp<IMemory> mapMemory(size_t offset, size_t size);
-};
-
-// ----------------------------------------------------------------------------
-
-/*
- * A simple templatized doubly linked-list implementation
- */
-
-template <typename NODE>
-class LinkedList
-{
- NODE* mFirst;
- NODE* mLast;
-
-public:
- LinkedList() : mFirst(0), mLast(0) { }
- bool isEmpty() const { return mFirst == 0; }
- NODE const* head() const { return mFirst; }
- NODE* head() { return mFirst; }
- NODE const* tail() const { return mLast; }
- NODE* tail() { return mLast; }
-
- void insertAfter(NODE* node, NODE* newNode) {
- newNode->prev = node;
- newNode->next = node->next;
- if (node->next == 0) mLast = newNode;
- else node->next->prev = newNode;
- node->next = newNode;
- }
-
- void insertBefore(NODE* node, NODE* newNode) {
- newNode->prev = node->prev;
- newNode->next = node;
- if (node->prev == 0) mFirst = newNode;
- else node->prev->next = newNode;
- node->prev = newNode;
- }
-
- void insertHead(NODE* newNode) {
- if (mFirst == 0) {
- mFirst = mLast = newNode;
- newNode->prev = newNode->next = 0;
- } else {
- newNode->prev = 0;
- newNode->next = mFirst;
- mFirst->prev = newNode;
- mFirst = newNode;
- }
- }
-
- void insertTail(NODE* newNode) {
- if (mLast == 0) {
- insertHead(newNode);
- } else {
- newNode->prev = mLast;
- newNode->next = 0;
- mLast->next = newNode;
- mLast = newNode;
- }
- }
-
- NODE* remove(NODE* node) {
- if (node->prev == 0) mFirst = node->next;
- else node->prev->next = node->next;
- if (node->next == 0) mLast = node->prev;
- else node->next->prev = node->prev;
- return node;
- }
-};
-
-
-/*
- * concrete implementation of AllocatorInterface using a simple
- * best-fit allocation scheme
- */
-class SimpleBestFitAllocator : public AllocatorInterface
-{
-public:
-
- SimpleBestFitAllocator(size_t size);
- virtual ~SimpleBestFitAllocator();
-
- virtual size_t allocate(size_t size, uint32_t flags = 0);
- virtual status_t deallocate(size_t offset);
- virtual size_t size() const;
- virtual void dump(const char* what, uint32_t flags = 0) const;
- virtual void dump(String8& res,
- const char* what, uint32_t flags = 0) const;
-
-private:
-
- struct chunk_t {
- chunk_t(size_t start, size_t size)
- : start(start), size(size), free(1), prev(0), next(0) {
- }
- size_t start;
- size_t size : 28;
- int free : 4;
- mutable chunk_t* prev;
- mutable chunk_t* next;
- };
-
- ssize_t alloc(size_t size, uint32_t flags);
- chunk_t* dealloc(size_t start);
- void dump_l(const char* what, uint32_t flags = 0) const;
- void dump_l(String8& res, const char* what, uint32_t flags = 0) const;
-
- static const int kMemoryAlign;
- mutable Mutex mLock;
- LinkedList<chunk_t> mList;
- size_t mHeapSize;
-};
+class SimpleBestFitAllocator;
// ----------------------------------------------------------------------------
class MemoryDealer : public RefBase
{
public:
+ MemoryDealer(size_t size, const char* name = 0);
- enum {
- READ_ONLY = MemoryHeapBase::READ_ONLY,
- PAGE_ALIGNED = AllocatorInterface::PAGE_ALIGNED
- };
-
- // creates a memory dealer with the SharedHeap and SimpleBestFitAllocator
- MemoryDealer(size_t size, uint32_t flags = 0, const char* name = 0);
-
- // provide a custom heap but use the SimpleBestFitAllocator
- MemoryDealer(const sp<HeapInterface>& heap);
-
- // provide both custom heap and allocotar
- MemoryDealer(
- const sp<HeapInterface>& heap,
- const sp<AllocatorInterface>& allocator);
-
- virtual sp<IMemory> allocate(size_t size, uint32_t flags = 0);
+ virtual sp<IMemory> allocate(size_t size);
virtual void deallocate(size_t offset);
- virtual void dump(const char* what, uint32_t flags = 0) const;
-
+ virtual void dump(const char* what) const;
sp<IMemoryHeap> getMemoryHeap() const { return heap(); }
- sp<AllocatorInterface> getAllocator() const { return allocator(); }
protected:
virtual ~MemoryDealer();
-private:
- const sp<HeapInterface>& heap() const;
- const sp<AllocatorInterface>& allocator() const;
-
- class Allocation : public BnMemory {
- public:
- Allocation(const sp<MemoryDealer>& dealer,
- ssize_t offset, size_t size, const sp<IMemory>& memory);
- virtual ~Allocation();
- virtual sp<IMemoryHeap> getMemory(ssize_t* offset, size_t* size) const;
- private:
- sp<MemoryDealer> mDealer;
- ssize_t mOffset;
- size_t mSize;
- sp<IMemory> mMemory;
- };
+private:
+ const sp<IMemoryHeap>& heap() const;
+ SimpleBestFitAllocator* allocator() const;
- sp<HeapInterface> mHeap;
- sp<AllocatorInterface> mAllocator;
+ sp<IMemoryHeap> mHeap;
+ SimpleBestFitAllocator* mAllocator;
};
#define LOG_TAG "MemoryDealer"
#include <binder/MemoryDealer.h>
+#include <binder/IPCThreadState.h>
+#include <binder/MemoryBase.h>
#include <utils/Log.h>
-#include <binder/IPCThreadState.h>
#include <utils/SortedVector.h>
#include <utils/String8.h>
-#include <binder/MemoryBase.h>
+#include <utils/threads.h>
#include <stdint.h>
#include <stdio.h>
namespace android {
// ----------------------------------------------------------------------------
-HeapInterface::HeapInterface() { }
-HeapInterface::~HeapInterface() { }
+/*
+ * A simple templatized doubly linked-list implementation
+ */
+
+template <typename NODE>
+class LinkedList
+{
+ NODE* mFirst;
+ NODE* mLast;
-// ----------------------------------------------------------------------------
+public:
+ LinkedList() : mFirst(0), mLast(0) { }
+ bool isEmpty() const { return mFirst == 0; }
+ NODE const* head() const { return mFirst; }
+ NODE* head() { return mFirst; }
+ NODE const* tail() const { return mLast; }
+ NODE* tail() { return mLast; }
+
+ void insertAfter(NODE* node, NODE* newNode) {
+ newNode->prev = node;
+ newNode->next = node->next;
+ if (node->next == 0) mLast = newNode;
+ else node->next->prev = newNode;
+ node->next = newNode;
+ }
-AllocatorInterface::AllocatorInterface() { }
-AllocatorInterface::~AllocatorInterface() { }
+ void insertBefore(NODE* node, NODE* newNode) {
+ newNode->prev = node->prev;
+ newNode->next = node;
+ if (node->prev == 0) mFirst = newNode;
+ else node->prev->next = newNode;
+ node->prev = newNode;
+ }
+
+ void insertHead(NODE* newNode) {
+ if (mFirst == 0) {
+ mFirst = mLast = newNode;
+ newNode->prev = newNode->next = 0;
+ } else {
+ newNode->prev = 0;
+ newNode->next = mFirst;
+ mFirst->prev = newNode;
+ mFirst = newNode;
+ }
+ }
+
+ void insertTail(NODE* newNode) {
+ if (mLast == 0) {
+ insertHead(newNode);
+ } else {
+ newNode->prev = mLast;
+ newNode->next = 0;
+ mLast->next = newNode;
+ mLast = newNode;
+ }
+ }
+
+ NODE* remove(NODE* node) {
+ if (node->prev == 0) mFirst = node->next;
+ else node->prev->next = node->next;
+ if (node->next == 0) mLast = node->prev;
+ else node->next->prev = node->prev;
+ return node;
+ }
+};
// ----------------------------------------------------------------------------
-class SimpleMemory : public MemoryBase {
+class Allocation : public MemoryBase {
public:
- SimpleMemory(const sp<IMemoryHeap>& heap, ssize_t offset, size_t size);
- virtual ~SimpleMemory();
+ Allocation(const sp<MemoryDealer>& dealer,
+ const sp<IMemoryHeap>& heap, ssize_t offset, size_t size);
+ virtual ~Allocation();
+private:
+ sp<MemoryDealer> mDealer;
};
+// ----------------------------------------------------------------------------
+
+class SimpleBestFitAllocator
+{
+ enum {
+ PAGE_ALIGNED = 0x00000001
+ };
+public:
+ SimpleBestFitAllocator(size_t size);
+ ~SimpleBestFitAllocator();
+
+ size_t allocate(size_t size, uint32_t flags = 0);
+ status_t deallocate(size_t offset);
+ size_t size() const;
+ void dump(const char* what) const;
+ void dump(String8& res, const char* what) const;
+
+private:
+
+ struct chunk_t {
+ chunk_t(size_t start, size_t size)
+ : start(start), size(size), free(1), prev(0), next(0) {
+ }
+ size_t start;
+ size_t size : 28;
+ int free : 4;
+ mutable chunk_t* prev;
+ mutable chunk_t* next;
+ };
+
+ ssize_t alloc(size_t size, uint32_t flags);
+ chunk_t* dealloc(size_t start);
+ void dump_l(const char* what) const;
+ void dump_l(String8& res, const char* what) const;
+
+ static const int kMemoryAlign;
+ mutable Mutex mLock;
+ LinkedList<chunk_t> mList;
+ size_t mHeapSize;
+};
// ----------------------------------------------------------------------------
-MemoryDealer::Allocation::Allocation(
- const sp<MemoryDealer>& dealer, ssize_t offset, size_t size,
- const sp<IMemory>& memory)
- : mDealer(dealer), mOffset(offset), mSize(size), mMemory(memory)
+Allocation::Allocation(
+ const sp<MemoryDealer>& dealer,
+ const sp<IMemoryHeap>& heap, ssize_t offset, size_t size)
+ : MemoryBase(heap, offset, size), mDealer(dealer)
{
+#ifndef NDEBUG
+ void* const start_ptr = (void*)(intptr_t(heap->base()) + offset);
+ memset(start_ptr, 0xda, size);
+#endif
}
-MemoryDealer::Allocation::~Allocation()
+Allocation::~Allocation()
{
- if (mSize) {
+ size_t freedOffset = getOffset();
+ size_t freedSize = getSize();
+ if (freedSize) {
/* NOTE: it's VERY important to not free allocations of size 0 because
* they're special as they don't have any record in the allocator
* and could alias some real allocation (their offset is zero). */
- mDealer->deallocate(mOffset);
- }
-}
+ mDealer->deallocate(freedOffset);
+
+ // keep the size to unmap in excess
+ size_t pagesize = getpagesize();
+ size_t start = freedOffset;
+ size_t end = start + freedSize;
+ start &= ~(pagesize-1);
+ end = (end + pagesize-1) & ~(pagesize-1);
+
+ // give back to the kernel the pages we don't need
+ size_t free_start = freedOffset;
+ size_t free_end = free_start + freedSize;
+ if (start < free_start)
+ start = free_start;
+ if (end > free_end)
+ end = free_end;
+ start = (start + pagesize-1) & ~(pagesize-1);
+ end &= ~(pagesize-1);
+
+ if (start < end) {
+ void* const start_ptr = (void*)(intptr_t(getHeap()->base()) + start);
+ size_t size = end-start;
-sp<IMemoryHeap> MemoryDealer::Allocation::getMemory(
- ssize_t* offset, size_t* size) const
-{
- return mMemory->getMemory(offset, size);
+#ifndef NDEBUG
+ memset(start_ptr, 0xdf, size);
+#endif
+
+ // MADV_REMOVE is not defined on Dapper based Goobuntu
+#ifdef MADV_REMOVE
+ if (size) {
+ int err = madvise(start_ptr, size, MADV_REMOVE);
+ LOGW_IF(err, "madvise(%p, %u, MADV_REMOVE) returned %s",
+ start_ptr, size, err<0 ? strerror(errno) : "Ok");
+ }
+#endif
+ }
+ }
}
// ----------------------------------------------------------------------------
-MemoryDealer::MemoryDealer(size_t size, uint32_t flags, const char* name)
- : mHeap(new SharedHeap(size, flags, name)),
+MemoryDealer::MemoryDealer(size_t size, const char* name)
+ : mHeap(new MemoryHeapBase(size, 0, name)),
mAllocator(new SimpleBestFitAllocator(size))
{
}
-MemoryDealer::MemoryDealer(const sp<HeapInterface>& heap)
- : mHeap(heap),
- mAllocator(new SimpleBestFitAllocator(heap->virtualSize()))
-{
-}
-
-MemoryDealer::MemoryDealer( const sp<HeapInterface>& heap,
- const sp<AllocatorInterface>& allocator)
- : mHeap(heap), mAllocator(allocator)
-{
-}
-
MemoryDealer::~MemoryDealer()
{
+ delete mAllocator;
}
-sp<IMemory> MemoryDealer::allocate(size_t size, uint32_t flags)
+sp<IMemory> MemoryDealer::allocate(size_t size)
{
sp<IMemory> memory;
- const ssize_t offset = allocator()->allocate(size, flags);
+ const ssize_t offset = allocator()->allocate(size);
if (offset >= 0) {
- sp<IMemory> new_memory = heap()->mapMemory(offset, size);
- if (new_memory != 0) {
- memory = new Allocation(this, offset, size, new_memory);
- } else {
- LOGE("couldn't map [%8lx, %u]", offset, size);
- if (size) {
- /* NOTE: it's VERY important to not free allocations of size 0
- * because they're special as they don't have any record in the
- * allocator and could alias some real allocation
- * (their offset is zero). */
- allocator()->deallocate(offset);
- }
- }
+ memory = new Allocation(this, heap(), offset, size);
}
return memory;
}
allocator()->deallocate(offset);
}
-void MemoryDealer::dump(const char* what, uint32_t flags) const
+void MemoryDealer::dump(const char* what) const
{
- allocator()->dump(what, flags);
+ allocator()->dump(what);
}
-const sp<HeapInterface>& MemoryDealer::heap() const {
+const sp<IMemoryHeap>& MemoryDealer::heap() const {
return mHeap;
}
-const sp<AllocatorInterface>& MemoryDealer::allocator() const {
+SimpleBestFitAllocator* MemoryDealer::allocator() const {
return mAllocator;
}
return 0;
}
-void SimpleBestFitAllocator::dump(const char* what, uint32_t flags) const
+void SimpleBestFitAllocator::dump(const char* what) const
{
Mutex::Autolock _l(mLock);
- dump_l(what, flags);
+ dump_l(what);
}
-void SimpleBestFitAllocator::dump_l(const char* what, uint32_t flags) const
+void SimpleBestFitAllocator::dump_l(const char* what) const
{
String8 result;
- dump_l(result, what, flags);
+ dump_l(result, what);
LOGD("%s", result.string());
}
void SimpleBestFitAllocator::dump(String8& result,
- const char* what, uint32_t flags) const
+ const char* what) const
{
Mutex::Autolock _l(mLock);
- dump_l(result, what, flags);
+ dump_l(result, what);
}
void SimpleBestFitAllocator::dump_l(String8& result,
- const char* what, uint32_t flags) const
+ const char* what) const
{
size_t size = 0;
int32_t i = 0;
i++;
cur = cur->next;
}
- snprintf(buffer, SIZE, " size allocated: %u (%u KB)\n", int(size), int(size/1024));
+ snprintf(buffer, SIZE,
+ " size allocated: %u (%u KB)\n", int(size), int(size/1024));
result.append(buffer);
}
-
-// ----------------------------------------------------------------------------
-
-SharedHeap::SharedHeap()
- : HeapInterface(), MemoryHeapBase()
-{
-}
-SharedHeap::SharedHeap(size_t size, uint32_t flags, char const * name)
- : MemoryHeapBase(size, flags, name)
-{
-}
-
-SharedHeap::~SharedHeap()
-{
-}
-
-sp<IMemory> SharedHeap::mapMemory(size_t offset, size_t size)
-{
- return new SimpleMemory(this, offset, size);
-}
-
-
-SimpleMemory::SimpleMemory(const sp<IMemoryHeap>& heap,
- ssize_t offset, size_t size)
- : MemoryBase(heap, offset, size)
-{
-#ifndef NDEBUG
- void* const start_ptr = (void*)(intptr_t(heap->base()) + offset);
- memset(start_ptr, 0xda, size);
-#endif
-}
-
-SimpleMemory::~SimpleMemory()
-{
- size_t freedOffset = getOffset();
- size_t freedSize = getSize();
-
- // keep the size to unmap in excess
- size_t pagesize = getpagesize();
- size_t start = freedOffset;
- size_t end = start + freedSize;
- start &= ~(pagesize-1);
- end = (end + pagesize-1) & ~(pagesize-1);
-
- // give back to the kernel the pages we don't need
- size_t free_start = freedOffset;
- size_t free_end = free_start + freedSize;
- if (start < free_start)
- start = free_start;
- if (end > free_end)
- end = free_end;
- start = (start + pagesize-1) & ~(pagesize-1);
- end &= ~(pagesize-1);
-
- if (start < end) {
- void* const start_ptr = (void*)(intptr_t(getHeap()->base()) + start);
- size_t size = end-start;
-
-#ifndef NDEBUG
- memset(start_ptr, 0xdf, size);
-#endif
-
- // MADV_REMOVE is not defined on Dapper based Goobuntu
-#ifdef MADV_REMOVE
- if (size) {
- int err = madvise(start_ptr, size, MADV_REMOVE);
- LOGW_IF(err, "madvise(%p, %u, MADV_REMOVE) returned %s",
- start_ptr, size, err<0 ? strerror(errno) : "Ok");
- }
-#endif
- }
-}
}; // namespace android
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