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LibC: Implement posix_memalign(3) and aligned_alloc(3)
Some ports linked against posix_memalign, but didn't use it, and others used it if it was Available. So I decided to implement posix_memalign. My implementation adds almost no overhead to regular mallocs. However, if an alignment is specified, it will use the smallest ChunkedBlock, for which aligned chunks exist, and simply use one of the chunks that is aligned. If it cannot use a ChunkedBlock, for size or alignment reasons, it will use a BigAllocationBlock, and return a pointer to the first aligned address past the start of the block. This implementation supports alignments up to 32768, due to the limitations of the BigAllocationBlock technique.
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4 changed files with 172 additions and 60 deletions
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@ -101,11 +101,7 @@ int posix_openpt(int flags);
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int grantpt(int fd);
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int unlockpt(int fd);
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// FIXME: Remove the ifdef once we have a working memalign implementation.
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// This is hidden by default until then because many applications prefer
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// `posix_memalign` over other implementations of aligned memory.
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#ifdef SERENITY_LIBC_SHOW_POSIX_MEMALIGN
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int posix_memalign(void**, size_t alignment, size_t size);
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#endif
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__attribute__((malloc, alloc_size(2), alloc_align(1))) void* aligned_alloc(size_t alignment, size_t size);
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__END_DECLS
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