Struct PosixMmapReadableFile

pub struct PosixMmapReadableFile { /* private fields */ }

| Implements random read access in a file using | mmap(). | | Instances of this class are thread-safe, as | required by the RandomAccessFile API. Instances | are immutable and Read() only calls thread-safe | library functions.

Implementations

impl PosixMmapReadableFile

pub fn new( filename: String, mmap_base: *mut u8, length: usize, mmap_limiter: *mut Limiter, ) -> Self

| mmap_base[0, length-1] points to the | memory-mapped contents of the file. It must | be the result of a successful call to | mmap(). This instances takes over the | ownership of the region. | | |mmap_limiter| must outlive this | instance. The caller must have already | aquired the right to use one mmap region, | which will be released when this instance is | destroyed.

Trait Implementations

impl Drop for PosixMmapReadableFile

fn drop(&mut self)

Executes the destructor for this type.

impl GetName for PosixMmapReadableFile

fn get_name(&self) -> &'static str

| Get a name for the file, only for error | reporting |

impl RandomAccessFileRead for PosixMmapReadableFile

fn read( &self, offset: u64, n: usize, result: *mut Slice, scratch: *mut u8, ) -> Status

| Read up to “n” bytes from the file starting | at “offset”. “scratch[0..n-1]” may be | written by this routine. Sets “*result” to | the data that was read (including if fewer | than “n” bytes were successfully read). May | set “*result” to point at data in | “scratch[0..n-1]”, so “scratch[0..n-1]” must | be live when “*result” is used. If an error | was encountered, returns a non-OK status. | | Safe for concurrent use by multiple threads.

impl RandomAccessFile for PosixMmapReadableFile