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buflib: update first_free_handle in handle_alloc

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Since we're scanning the handle table for the first free slot,
we know none of the scanned slots are free. Use that knowledge
to update first_free_handle and avoid rescanning filled slots
again when the next handle is allocated.

Change-Id: I457372f66c231168cfffa7e905d1e9fb80002f5f
This commit is contained in:
Aidan MacDonald 2022-03-28 21:30:58 +01:00
parent f622bcfe4f
commit 840f6b79c7
1 changed files with 9 additions and 0 deletions
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9
firmware/buflib.c
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@ -196,8 +196,17 @@ union buflib_data* handle_alloc(struct buflib_context *ctx)
if (handle >= ctx->alloc_end) if (handle >= ctx->alloc_end)
ctx->last_handle--; ctx->last_handle--;
else else
{
/* We know the table is full, so update first_free_handle */
ctx->first_free_handle = ctx->last_handle - 1;
return NULL; return NULL;
}
} }
/* We know there are no free handles between the old first_free_handle
* and the found handle, therefore we can update first_free_handle */
ctx->first_free_handle = handle - 1;
handle->val = -1; handle->val = -1;
return handle; return handle;
} }