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54 lines
1.9 KiB
54 lines
1.9 KiB
5 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef VMPI_FILESYSTEM_H
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#define VMPI_FILESYSTEM_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "interface.h"
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class IFileSystem;
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class MessageBuffer;
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// Use this to read virtual files.
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#define VMPI_VIRTUAL_FILES_PATH_ID "VMPI_VIRTUAL_FILES_PATH_ID"
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// When you hook the file system with VMPI and are a worker, it blocks on file reads
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// and uses MPI to communicate with the master to transfer files it needs over.
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//
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// The filesystem, by default (and it maxFileSystemMemoryUsage is left at zero),
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// keeps the contents of the files that get opened in memory. You can pass in a
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// value here to put a cap on it, in which case it'll unload the least-recently-used
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// files when it hits the limit.
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IFileSystem* VMPI_FileSystem_Init( int maxFileSystemMemoryUsage, IFileSystem *pPassThru );
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// On the master machine, this really should be called before the app shuts down and
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// global destructors are called. If it isn't, it might lock up waiting for a thread to exit.
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//
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// This returns the original filesystem you passed into VMPI_FileSystem_Init so you can uninitialize it.
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IFileSystem* VMPI_FileSystem_Term();
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// Causes it to error out on any Open() calls.
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void VMPI_FileSystem_DisableFileAccess();
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// Returns a factory that will hand out BASEFILESYSTEM_INTERFACE_VERSION when asked for it.
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CreateInterfaceFn VMPI_FileSystem_GetFactory();
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// This function creates a virtual file that workers can then open and read out of.
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// NOTE: when reading from the file, you must use VMPI_VIRTUAL_FILES_PATH_ID as the path ID
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// or else it won't find the file.
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void VMPI_FileSystem_CreateVirtualFile( const char *pFilename, const void *pData, unsigned long fileLength );
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#endif // VMPI_FILESYSTEM_H
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