由C11aligned_alloc分配的内存的重新分配是否保持对齐? [英] Does realloc of memory allocated by C11 aligned_alloc keep the alignment?

问题描述

考虑以下(C11)代码:

Consider the following (C11) code:

void *ptr = aligned_alloc(4096, 4096);
... // do something with 'ptr'
ptr = realloc(ptr, 6000);

由于ptr指向的内存具有与aligned_alloc相同的4096字节对齐方式，在(成功)调用realloc之后，它会(保持:读取)是否会保持该对齐方式?还是可以将内存还原为默认对齐方式?

Since the memory that ptr points to has a 4096-byte alignment from aligned_alloc, will it (read: is it guaranteed to) keep that alignment after a (successful) call to realloc? Or could the memory revert to the default alignment?

推荐答案

对齐方式不与指针保持一致.调用realloc时，只能依靠realloc保证的对齐方式.您需要使用aligned_alloc来执行任何重新分配.

The alignment is not kept with the pointer. When you call realloc you can only rely on the alignment that realloc guarantees. You'll need to use aligned_alloc to perform any reallocations.

这篇关于由C11aligned_alloc分配的内存的重新分配是否保持对齐?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！