blocks|key|181361|text|为了避免内存泄漏，首先需要固定阵列。钉扎防止指向的对象在垃圾收集堆上移动。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|181362|有一个类似于您正在做的这里的例子。|181363|但是，这个例子还不够深入，因为它只是引脚而不控制初始内存分配。若要防止内存泄漏，请使用GCHandle.Alloc与GCHandleType.Pinned。就像这。|181364|entityMap|0|LINK|mutability|MUTABLE|url|https://learn.microsoft.com/en-us/cpp/extensions/how-to-pin-pointers-and-arrays?view=msvc-170|1|https://stackoverflow.com/questions/37613056/align-bit-array-to-64-bit-boundary-c-sharp|2|https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.gchandle.alloc?redirectedfrom=MSDN&view=net-6.0#System_Runtime_InteropServices_GCHandle_Alloc_System_Object_System_Runtime_InteropServices_GCHandleType_|3|https://stackoverflow.com/a/14735571/1657610^0|D|4|0|0|B|2|1|0|17|Y|2|28|1|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]]|C|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]]]

To avoid the memory leak, first you need to <a href="https://learn.microsoft.com/en-us/cpp/extensions/how-to-pin-pointers-and-arrays?view=msvc-170" rel="nofollow noreferrer">pin the array</a>. Pinning prevents the object pointed to from moving on the garbage-collected heap.
There's an example of something similar to what you're doing <a href="https://stackoverflow.com/questions/37613056/align-bit-array-to-64-bit-boundary-c-sharp">here</a>.
However, that example doesn't go far enough as it only pins without controlling the initial memory allocation. To also prevent the memory leak, instead use <a href="https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.gchandle.alloc?redirectedfrom=MSDN&amp;view=net-6.0#System_Runtime_InteropServices_GCHandle_Alloc_System_Object_System_Runtime_InteropServices_GCHandleType_" rel="nofollow noreferrer">GCHandle.Alloc with GCHandleType.Pinned</a>. Like <a href="https://stackoverflow.com/a/14735571/1657610">this</a>.

blocks|key|720449|text|如前所述，.NET+6有NativeMemory.AlignedAlloc。您需要确保调用AlignedFree，否则可能会有泄漏。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|720450|void*+a+=+default;
try
{
++++a+=+NativeMemory.AlignedAlloc(size+*+sizeof(long),+64);
++++var+span+=+new+Span<long>(a,+size);
++++//+fill+span
++++//+call+DLL+with+span
}
finally
{
++++NativeMemory.AlignedFree(a);
}|code-block|syntax|javascript|720451|固定的GCHandle是旧版本的.NET的另一种选择，然后您需要根据下面的代码计算开始对齐偏移量，在这种情况下，alignment将是64。|720452|var+ptr+=+(long)handle.AddrOfPinnedObject();
var+offset+=+(int)+((ptr+%2B+alignment+-+1)+/+alignment+*+alignment+-+ptr)+/+sizeof(long);|720453|同样，您需要确保在一个handle.Free中调用finally。|720454|entityMap|0|LINK|mutability|MUTABLE|url|https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.nativememory.alignedalloc?view=net-6.0^0|C|P|19|B|C|P|0|0|0|3|8|1K|9|1V|2|0|0|B|B|P|7|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1E|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

As mentioned, .NET 6 has <a href="https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.nativememory.alignedalloc?view=net-6.0" rel="nofollow noreferrer"><code>NativeMemory.AlignedAlloc</code></a>. You need to make sure to call <code>AlignedFree</code> otherwise you could get a leak.
<pre class="lang-cs prettyprint-override"><code>void* a = default;
try
{
 a = NativeMemory.AlignedAlloc(size * sizeof(long), 64);
 var span = new Span&lt;long&gt;(a, size);
 // fill span
 // call DLL with span
}
finally
{
 NativeMemory.AlignedFree(a);
}
</code></pre>
A pinned <code>GCHandle</code> is another option for older versions of .NET. You then need to calculate the starting aligned offset with the following code, where <code>alignment</code> would be <code>64</code> in your case.
<pre class="lang-cs prettyprint-override"><code>var ptr = (long)handle.AddrOfPinnedObject();
var offset = (int) ((ptr + alignment - 1) / alignment * alignment - ptr) / sizeof(long);
</code></pre>
Again you need to make sure to call <code>handle.Free</code> in a <code>finally</code>.

I need to create a array that is aligned to a 64 byte boundary. I need to do this as I'm calling a DLL which uses <a href="https://en.wikipedia.org/wiki/Advanced_Vector_Extensions" rel="nofollow noreferrer">AVX</a>, which requires the <a href="https://www.felixcloutier.com/x86/movdqa:vmovdqa32:vmovdqa64" rel="nofollow noreferrer">data to be aligned</a>. Essentially I need to do this in C#:
<pre><code>void* ptr = _aligned_malloc(64 * 1024, 64);
int8_t* memory_ptr = (int8_t*)ptr;
</code></pre>
I'm pretty sure I can't create an array to such a boundary naturally in C#. So one option is to create an byte array that is x+64 long, and then 'create' an array that overlays it, but with an offset at the required boundary.
The problem is how do I accomplish this, and not have a memory leak? (Memory leaking is the reason I'd rather not use the DLL to create a reference to the array and pass it to C#. Unless there is a good way to do so?)
<hr />
Using the helpful answers below, this is what I have, hopefully it helps others:
<pre><code>public class Example : IDisposable
{
 private ulong memory_ptr;

 public unsafe Example() 
 {
 memory_ptr = (ulong)NativeMemory.AlignedAlloc(0x10000, 64);
 }

 public unsafe Span&lt;byte&gt; Memory =&gt; new Span&lt;byte&gt;((void*)memory_ptr, 0x10000);

 public unsafe void Dispose()
 {
 NativeMemory.Free((void*)memory_ptr);
 }
}
</code></pre>

Create Memory Aligned Array in C#

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没有提供实际的解决方法或示例。

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