_aligned_malloc 基于malloc。_aligned_malloc 标记为 __declspec(noalias) 和__declspec(restrict);这意味着函数保证不修改全局变量,和返回的指针不用做别名。 有关更多信息,请参见 没有别名 和限制。如果内存分配失败或是如果请求的大小比_HEAP_MAXREQ 更大,则函数将 ENOMEM 设置为 errno。 有关 errno的更多...
void* _aligned_malloc(size_tsize,size_talignment ); 参数 size 请求的内存分配的大小。 alignment 对齐值,必须是 2 的整数次幂。 返回值 指向已分配的内存块的指针或NULL(如果操作失败)。 指针是一个多重alignment。 注解 _aligned_malloc基于malloc。
#include<iostream>void*aligned_malloc(size_tsize,intalignment){// 分配足够的内存, 这里的算法很经典, 早期的STL中使用的就是这个算法// 首先是维护FreeBlock指针占用的内存大小constintpointerSize =sizeof(void*);// alignment - 1 + pointerSize这个是FreeBlock内存对齐需要的内存大小// 前面的例子sizeof(T...
ptr = _aligned_malloc(100, alignment); if (ptr == NULL) { printf_s( "Error allocation aligned memory."); return -1; } if (((int)ptr % alignment ) == 0) printf_s( "This pointer, %d, is aligned on %d\n", ptr, alignment); else printf_s( "This pointer, %d, is not aligne...
// crt_aligned_malloc.c #include <malloc.h> #include <stdio.h> int main() { void *ptr; size_t alignment, off_set; // Note alignment should be 2^N where N is any positive int. alignment = 16; off_set = 5; // Using _aligned_malloc ...
_aligned_malloc is based on malloc._aligned_malloc is marked __declspec(noalias) and __declspec(restrict), meaning that the function is guaranteed not to modify global variables and that the pointer returned isn't aliased. For more information, see noalias and restrict....
实现aligned_malloc 源代码 从C++17开始,可以使用aligned_alloc函数达到这个目的,但是如果使用较老的C++版本,如C++14,C++11,我们需要手动写一个实现。 话不多说,先贴代码如下,aligned_malloc和aligned_free,需要配合使用,否则会有内存泄漏问题。 #include<memory>void*aligned_malloc(size_tsize,size_talignment){siz...
_aligned_malloc<malloc.h><cstdlib> Example CCopy // crt_aligned_malloc.c#include<malloc.h>#include<stdio.h>intmain(){void*ptr;size_talignment, off_set;// Note alignment should be 2^N where N is any positive int.alignment =16; off_set =5;// Using _aligned_mallocptr = _aligned_mal...
#include <cstdio> #include <cstdlib> int main(int argc, char** argv) { { int* p1 = static_cast<int*>(std::malloc(10*sizeof *p1)); std::printf("default-aligned address: %p\n", static_cast<void*>(p1)); std::free(p1); int* p2 = static_cast<int*>(_aligned_malloc(1024, ...
_aligned_malloc<malloc.h><cstdlib> Example CCopy // crt_aligned_malloc.c#include<malloc.h>#include<stdio.h>intmain(){void*ptr;size_talignment, off_set;// Note alignment should be 2^N where N is any positive int.alignment =16; off_set =5;// Using _aligned_mallocptr = _aligned_mal...