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

IHostMAlloc::Alloc Method - .NET Framework

Requests that the host allocate the specified amount of memory from the heap.

Syntax

HRESULT Alloc (  
    [in] SIZE_T  cbSize,
    [in] EMemoryCriticalLevel dwCriticalLevel,
    [out] void** ppMem  
);

Parameters

cbSize
[in] The size, in bytes, of the current memory allocation request.

dwCriticalLevel
[in] One of the EMemoryCriticalLevel values, indicating the impact of an allocation failure.

ppMem
[out] A pointer to the allocated memory, or null if the request could not be completed.

Return Value HRESULT Description S_OK Alloc 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. E_OUTOFMEMORY Not enough memory was available to complete the allocation request.

The CLR gets an interface pointer to an IHostMalloc instance by calling the IHostMemoryManager::CreateMalloc method.

Requirements

Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0