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Showing content from https://docs.microsoft.com/en-us/dotnet/framework/unmanaged-api/hosting/ihostmalloc-free-method below:

IHostMAlloc::Free Method - .NET Framework

IHostMAlloc::Free Method

In this article

Frees memory that was allocated by using the Alloc function.

Syntax

HRESULT Free (  
    [in] void* pMem  
);

Parameters

pMem
[in] A pointer to the memory to be freed.

Return Value HRESULT Description S_OK Free returned successfully. HOST_E_CLRNOTAVAILABLE The common language runtime (CLR) has not been loaded into a process, or the CLR is in a state in which it cannot run managed code or process the call successfully. HOST_E_TIMEOUT The call timed out. HOST_E_NOT_OWNER The caller does not own the lock. HOST_E_ABANDONED An event was canceled while a blocked thread or fiber was waiting on it. E_FAIL An unknown catastrophic failure occurred. When a method returns E_FAIL, the CLR is no longer usable within the process. Subsequent calls to hosting methods return HOST_E_CLRNOTAVAILABLE. HOST_E_INVALIDOPERATION An attempt was made to free memory that was not allocated through the host.

If the pMem parameter refers to a region of memory that was not allocated by using a call to Alloc, the host should return HOST_E_INVALIDOPERATION.

Requirements

Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0