Details after system cleanup and installation of PCRE from sources with JIT support enabled:
Even in the best case scenario where our pointer is already aligned, we need to handle this API in a generic way. Offset storage is always required. Once we have our new aligned address, we move backwards in memory from the aligned location to store the offset. We now know we always need to look one location back from our aligned pointer to find the true offset.
Note well: If you call free on an aligned pointer, free will not recognize the allocation and you may crash or experience other strange effects. You can find an aligned malloc example in the embedded-resources git repository.
c++ - OSX lacks memalign - Stack Overflow
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Software References. Hardware References. Development Kits. Technology Radar. These alignment requirements exist in many places, some including: Example usage of the alignment attribute from the GNU documentation: Dynamic Memory Alignment: Overall Approach Since we have already implemented malloc on our system or have malloc defined on a host , we can use malloc as our base memory allocator.
Re: posix_memalign on Mac results in an apparent leak
Since malloc is not guaranteed to align our memory for us, we'll need to perform two extra steps: Request extra bytes so we can returned an aligned address Request extra bytes and store the offset between our original pointer and our aligned pointer By allocating these extra bytes, we are making a tradeoff between generating aligned memory and wasting some bytes to ensure the alignment requirement can be met.
There is a single total order of all allocation and deallocation functions operating on each particular region of memory. On success, returns the pointer to the beginning of newly allocated memory. To avoid a memory leak, the returned pointer must be deallocated with free or realloc. Passing a size which is not an integral multiple of alignment or a alignment which is not valid or not supported by the implementation causes the function to fail and return a null pointer C11, as published, specified undefined behavior in this case, this was corrected by DR Removal of size restrictions to make it possible to allocate small objects at restrictive alignment boundaries similar to alignas has been proposed by n I think it's definitely worth a bug report.
[libdispatch-dev] Solaris portability, POSIX memalign checking in configure.ac - PATCH [1/6]
If nothing else, the man page should discuss whether a zero size is undefined behaviour or not. Also, here's a reference about 0-sized allocs: It's filed through https: Thus, as far as I know, the number is only useful to me and Apple. Is there a better place to put such reports? I'll fix a few other places in my code to check for this.
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Geoffrey Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Paul Floyd. In reply to this post by John Reiser. John Reiser wrote: It should return a valid pointar that should not be dereferenced.
Patrick J. In reply to this post by Sean McBride. Nice catch. In reply to this post by Geoffrey Irving