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From "Marvin Humphrey (JIRA)" <>
Subject [jira] Created: (LUCY-83) FSFileHandle
Date Sun, 06 Dec 2009 00:07:20 GMT

                 Key: LUCY-83
             Project: Lucy
          Issue Type: Sub-task
          Components: Core
            Reporter: Marvin Humphrey
            Assignee: Marvin Humphrey
            Priority: Blocker

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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