diff options
author | Matthew Sotoudeh <matthew@masot.net> | 2024-05-16 14:03:57 -0700 |
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committer | Matthew Sotoudeh <matthew@masot.net> | 2024-05-16 14:03:57 -0700 |
commit | 54c09d54c0c170f1369751f8bf5a8a0b771a167c (patch) | |
tree | e73ab0e8b25602f8c7233ea7794020224fae92aa /buddy.h | |
parent | 940716fa2fa134a75d2ef34b41991c1c1c14735a (diff) |
reorganize
Diffstat (limited to 'buddy.h')
-rw-r--r-- | buddy.h | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/buddy.h b/buddy.h deleted file mode 100644 index c8778d6..0000000 --- a/buddy.h +++ /dev/null @@ -1,55 +0,0 @@ -#pragma once -#include <stdint.h> -#include <stddef.h> - -#define MAGIC_COOKIE_BYTES 32 -#define ADDRESS_BITS (8 * sizeof(void*)) - -struct buddy { - uint8_t magic[MAGIC_COOKIE_BYTES]; - struct free_block *(avail[ADDRESS_BITS]); - size_t root_logsize; - void *base; -}; - -// Initialize a buddy with (constant) global state stored in @state. -// NOTE: after initializing the buddy, you should always pass the exact same -// pointer in for @state in future calls. If you need to move @state, use -// move_buddy(...). -void init_buddy(uint8_t *base, size_t size, uint8_t magic[MAGIC_COOKIE_BYTES], - struct buddy *state); - -// Allocate a block of size >= @size -void *allocate(size_t size, struct buddy *state); - -// Liberate a block of size @size starting at @base. -void liberate(void *base, size_t size, struct buddy *state); - -// Print debug information for the allocator. -void debug_buddy(struct buddy *state); - -// Simulates @new = allocate, memcpy(@new, @old), free(@old), with some -// optimizations for cases where the reallocation can be done in place. -void *reallocate(void *old, size_t old_size, size_t new_size, - struct buddy *state); - -// Attempts to reserve a range [@start,@start+@size). -// Returns 1 if success, 0 otherwise. -// Whenever possible, we avoid writing anything into the reserved region. -int reserve(void *start, size_t size, struct buddy *state); - -// Update @state to assume the memory pool has been copied to -// [@new_base,@new_base+@new_size) -// Can *ONLY* be used when @new_size >= the existing size. -void grow_buddy(uint8_t *new_base, size_t new_size, struct buddy *state); - -// Update @state to only use the subset of the pool in range -// [@state->base,@state->base+new_size) -// Can *ONLY* be used when @new_size <= the existing size. -// This *CAN* write to anything in the old pool. -// This *CAN* fail, in which case everything is unmodified and 0 is returned. -// Upon success, 1 is returned. -int shrink_buddy(size_t new_size, struct buddy *state); - -// Used to move the global state of the buddy. -void move_buddy(struct buddy *new_state, struct buddy *old_state); |