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buflib: add pin/unpin operation

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An allocation is pinned by calling buflib_pin() to up its pin count.
The pin count is like a reference count: when above 0, buflib won't
move the allocation and won't call its move callbacks. This makes it
safe to hold the pointer returned by buflib_get_data() across yields
or allocations.

Note that pinned allocations can still shrink because there are some
use cases where this would be valid, if buffer users coordinate with
the shrink callback.

Change-Id: I0d0c2a8ac7d891d3ad6b3d0eb80c5b5a1b4b9a9d
This commit is contained in:
Aidan MacDonald 2022-04-03 10:48:14 +01:00
parent ecfec3e9bf
commit f47aa584a8
4 changed files with 79 additions and 4 deletions
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3
firmware/include/core_alloc.h
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@ -14,6 +14,9 @@ int core_alloc(const char* name, size_t size);
int core_alloc_ex(const char* name, size_t size, struct buflib_callbacks *ops);
int core_alloc_maximum(const char* name, size_t *size, struct buflib_callbacks *ops);
bool core_shrink(int handle, void* new_start, size_t new_size);
void core_pin(int handle);
void core_unpin(int handle);
unsigned core_pin_count(int handle);
int core_free(int handle);
size_t core_available(void);
size_t core_allocatable(void);