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Expose reserve_at_least in all Pals

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Matthew Parkinson
2021-07-16 09:41:58 +01:00
committed by Matthew Parkinson
parent 2ba0de76b3
commit 8b1ffbc166
3 changed files with 7 additions and 49 deletions
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docs/PORTING.md
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@@ -49,9 +49,10 @@ template<bool committed>
static void* reserve_aligned(size_t size) noexcept;
static std::pair<void*, size_t> reserve_at_least(size_t size) noexcept;
```
Only one of these needs to be implemented, depending on whether the underlying
system can provide strongly aligned memory regions.
If the system guarantees only page alignment, implement the second. The Pal is
All platforms should provide `reserve_at_least` and can optionally provide
`reserve_aligned` if the underlying system can provide strongly aligned
memory regions.
If the system guarantees only page alignment, implement only the second. The Pal is
free to overallocate based on the platform's desire and snmalloc
will find suitably aligned blocks inside the region. `reserve_at_least` should
not commit memory as snmalloc will commit the range of memory it requires of what