Panda3D
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An implementation of a very simple block allocator. More...
Public Member Functions | |
SimpleAllocator (unsigned int max_size, Mutex lock) | |
SimpleAllocatorBlock | alloc (unsigned int size) |
Allocates a new block. | |
unsigned int | getContiguous () |
Returns an upper-bound estimate of the size of the largest contiguous block that may be allocated. | |
SimpleAllocatorBlock | getFirstBlock () |
Returns a pointer to the first allocated block, or NULL if there are no allocated blocks. | |
unsigned int | getMaxSize () |
Returns the available space for allocated objects. | |
unsigned int | getTotalSize () |
Returns the total size of allocated objects. | |
bool | isEmpty () |
Returns true if there are no blocks allocated on this page, or false if there is at least one. | |
output (ostream out) | |
setMaxSize (unsigned int max_size) | |
Changes the available space for allocated objects. | |
write (ostream out) |
An implementation of a very simple block allocator.
This class can allocate ranges of nonnegative integers within a specified upper limit; it uses a simple first-fit algorithm to find the next available space.
SimpleAllocator | ( | unsigned int | max_size, |
Mutex | lock | ||
) |
SimpleAllocatorBlock alloc | ( | unsigned int | size | ) |
Allocates a new block.
Returns NULL if a block of the requested size cannot be allocated.
To free the allocated block, call block->free(), or simply delete the block pointer.
Reimplemented in VertexDataPage.
unsigned int getContiguous | ( | ) |
Returns an upper-bound estimate of the size of the largest contiguous block that may be allocated.
It is guaranteed that an attempt to allocate a block larger than this will fail, though it is not guaranteed that an attempt to allocate a block this size or smaller will succeed.
SimpleAllocatorBlock getFirstBlock | ( | ) |
Returns a pointer to the first allocated block, or NULL if there are no allocated blocks.
Reimplemented in VertexDataPage.
unsigned int getMaxSize | ( | ) |
Returns the available space for allocated objects.
unsigned int getTotalSize | ( | ) |
Returns the total size of allocated objects.
bool isEmpty | ( | ) |
Returns true if there are no blocks allocated on this page, or false if there is at least one.
output | ( | ostream | out | ) |
Reimplemented in VertexDataPage.
setMaxSize | ( | unsigned int | max_size | ) |
Changes the available space for allocated objects.
This will not affect any already-allocated objects, but will have an effect on future calls to alloc().
write | ( | ostream | out | ) |