forked from len0rd/rockbox
7faf6be35f
chunk_alloc allows arrays (or any data) to be allocated in smaller chunks you have to save the indices.. variable data will have variable indices you need to store these as [chunk_alloc] doesn't keep track if you have a fixed size for each alloc you can do indice / sizeof(data) or index * sizeof(data) to convert Lots of debug stuff still in and it needs optimization User provides chunk_size and max_chunks max_chunks * struct chunk will be allocated at start with (1) chunk_size allocation initially alloc_chunk() with size = 0 shrinks the last allocation to the size of the data used add OOM checks on buflib_alloc -- oops move bytes available to the header -- less memory per chunk & better alignment keep track of the current in use chunk index -- should speed things up a bit Now allows: realloc chunk header larger allocations than chunk size reallocs smaller than existing will shrink the current array rather than alloc a new and copy data Comments welcome :) Change-Id: I8ed170eef73da95da19430a80b32e5debf0c8276
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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#ifndef __CORE_ALLOC_H__
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#define __CORE_ALLOC_H__
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#include <string.h>
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#include <stdbool.h>
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#include "config.h"
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#include "buflib.h"
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#include "chunk_alloc.h"
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/* All functions below are wrappers for functions in buflib.h, except
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* they have a predefined context
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*/
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void core_allocator_init(void) INIT_ATTR;
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int core_alloc(const char* name, size_t size);
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int core_alloc_ex(const char* name, size_t size, struct buflib_callbacks *ops);
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int core_alloc_maximum(const char* name, size_t *size, struct buflib_callbacks *ops);
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bool core_shrink(int handle, void* new_start, size_t new_size);
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void core_pin(int handle);
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void core_unpin(int handle);
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unsigned core_pin_count(int handle);
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int core_free(int handle);
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size_t core_available(void);
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size_t core_allocatable(void);
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const char* core_get_name(int handle);
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#ifdef DEBUG
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void core_check_valid(void);
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#endif
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/* DO NOT ADD wrappers for buflib_buffer_out/in. They do not call
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* the move callbacks and are therefore unsafe in the core */
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#ifdef BUFLIB_DEBUG_BLOCK_SINGLE
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int core_get_num_blocks(void);
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void core_print_block_at(int block_num, char* buf, size_t bufsize);
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#endif
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/* frees the debug test alloc created at initialization,
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* since this is the first any further alloc should force a compaction run */
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bool core_test_free(void);
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static inline void* core_get_data(int handle)
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{
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extern struct buflib_context core_ctx;
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return buflib_get_data(&core_ctx, handle);
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}
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/* core context chunk_alloc */
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static inline bool core_chunk_alloc_init(struct chunk_alloc_header *hdr,
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size_t chunk_size, size_t max_chunks)
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{
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extern struct buflib_context core_ctx;
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return chunk_alloc_init(hdr, &core_ctx, chunk_size, max_chunks);
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}
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#endif /* __CORE_ALLOC_H__ */
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