leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile Class Reference

Inheritance diagram for leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile:

Collaboration diagram for leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile:

Public Member Functions
	PosixMmapReadableFile (const std::string &fname, void *base, size_t length, MmapLimiter *limiter)
virtual	~PosixMmapReadableFile ()
virtual Status	Read (uint64_t offset, size_t n, Slice *result, char *scratch) const
Public Member Functions inherited from leveldb::RandomAccessFile
	RandomAccessFile ()
virtual	~RandomAccessFile ()

Private Attributes
std::string	filename_
void *	mmapped_region_
size_t	length_
MmapLimiter *	limiter_

Detailed Description

Definition at line 142 of file env_posix.cc.

Constructor & Destructor Documentation

PosixMmapReadableFile()

leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::PosixMmapReadableFile ( const std::string &  fname, void *  base, size_t  length, MmapLimiter *  limiter  )

inline

Definition at line 151 of file env_posix.cc.

      : filename_(fname), mmapped_region_(base), length_(length),
        limiter_(limiter) {
  }

~PosixMmapReadableFile()

virtual leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::~PosixMmapReadableFile ( )

inlinevirtual

Definition at line 157 of file env_posix.cc.

                                   {
    munmap(mmapped_region_, length_);
    limiter_->Release();
  }

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Member Function Documentation

Read()

virtual Status leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::Read ( uint64_t  offset, size_t  n, Slice *  result, char *  scratch  ) const

inlinevirtual

Implements leveldb::RandomAccessFile.

Definition at line 162 of file env_posix.cc.

                                           {
    Status s;
    if (offset + n > length_) {
      *result = Slice();
      s = IOError(filename_, EINVAL);
    } else {
      *result = Slice(reinterpret_cast<char*>(mmapped_region_) + offset, n);
    }
    return s;
  }

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Member Data Documentation

filename_

std::string leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::filename_

private

Definition at line 144 of file env_posix.cc.

length_

size_t leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::length_

private

Definition at line 146 of file env_posix.cc.

limiter_

MmapLimiter* leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::limiter_

private

Definition at line 147 of file env_posix.cc.

mmapped_region_

void* leveldb::anonymous_namespace{env_posix.cc}::PosixMmapReadableFile::mmapped_region_

private

Definition at line 145 of file env_posix.cc.

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The documentation for this class was generated from the following file:

• util/env_posix.cc