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From "Marvin Humphrey (JIRA)" <>
Subject [jira] Updated: (LUCY-83) FSFileHandle
Date Sun, 06 Dec 2009 00:33:20 GMT


Marvin Humphrey updated LUCY-83:

    Attachment: fsfilehandle_support.diff

> FSFileHandle
> ------------
>                 Key: LUCY-83
>                 URL:
>             Project: Lucy
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Marvin Humphrey
>            Assignee: Marvin Humphrey
>            Priority: Blocker
>         Attachments: FSFileHandle.bp, FSFileHandle.c, fsfilehandle_support.diff, lseek64_pread64.diff,
TestFSFileHandle.bp, TestFSFileHandle.c
> FSFileHandle abstracts out low level interaction with the OS and file system.
> Some form of memory map support is required: mmap() on unixen, and
> CreateFileMapping()/MapViewOfFile() on Windows.
> Only atomic, positional reads are supported, using 64-bit pread() on unixen,
> and ReadFile() with an OVERLAPPED structure on Windows.
> Multiple InStreams may share a single read-only FSFileHandle, because
> FSFH_Read() does not change file position or other state in the underlying
> OS-specific file object.  Theoretically, operating multiple InStreams in
> different threads against a single shared FileHandle will also work -- which
> is crucial for threadsafe compound files.  Thread safety is as yet untested, 
> though, since Lucy's Perl bindings are single-threaded.

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