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buflib: Change buflib_available() and add buflib_allocatable().

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buflib_allocatable() is what buflib_available() was before (it was in fact
simply renamed). It returns the largest contiguous block of memory. This
can be allocated and will definitely succeed, although larger allocations
may also succeed if the buffer can be compacted and shrinked.

buflib_available() now counts all free bytes, contiguous or not. This
better matches the description and how the caller use it.

Change-Id: I511e4eb5f4cf1821d957b3f4ef8a685ce40fe289
Reviewed-on: http://gerrit.rockbox.org/481
Reviewed-by: Thomas Martitz <kugel@rockbox.org>
Tested-by: Thomas Martitz <kugel@rockbox.org>
This commit is contained in:
Thomas Martitz 2013-05-29 07:07:34 +02:00
parent f9e47c6886
commit af4e408555
4 changed files with 41 additions and 7 deletions
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firmware/include/core_alloc.h
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@ -16,6 +16,7 @@ int core_alloc_maximum(const char* name, size_t *size, struct buflib_callbacks *
bool core_shrink(int handle, void* new_start, size_t new_size);
int core_free(int handle);
size_t core_available(void);
size_t core_allocatable(void);
/* DO NOT ADD wrappers for buflib_buffer_out/in. They do not call
* the move callbacks and are therefore unsafe in the core */