55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//========= 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
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// reads and uses MPI to communicate with the master to transfer files it needs
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// 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
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// least-recently-used files when it hits the limit.
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IFileSystem *VMPI_FileSystem_Init(int maxFileSystemMemoryUsage,
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IFileSystem *pPassThru);
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// On the master machine, this really should be called before the app shuts down
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// and global destructors are called. If it isn't, it might lock up waiting for
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// a thread to exit.
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//
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// This returns the original filesystem you passed into VMPI_FileSystem_Init so
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// 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
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// 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
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// of. NOTE: when reading from the file, you must use VMPI_VIRTUAL_FILES_PATH_ID
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// as the path ID or else it won't find the file.
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void VMPI_FileSystem_CreateVirtualFile(const char *pFilename, const void *pData,
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unsigned long fileLength);
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#endif // VMPI_FILESYSTEM_H
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