man POE::Driver::SysRW (3): buffered, non-blocking I/O using sysread and syswrite

SYNOPSIS

``SYNOPSIS'' in POE::Driver illustrates how the interface works. This module is merely one implementation.

DESCRIPTION

This driver implements POE::Driver using sysread and syswrite.

PUBLIC METHODS

POE::Driver::SysRW introduces some additional features not covered in the base interface.

new [BlockSize => OCTETS]

new() creates a new buffered I/O driver that uses sysread() to read data from a handle and syswrite() to flush data to that handle. The constructor accepts one optional named parameter, "BlockSize", which indicates the maximum number of OCTETS that will be read at one time.

"BlockSize" is 64 kilobytes (65536 octets) by default. Higher values may improve performance in streaming applications, but the trade-off is a lower event granularity and increased resident memory usage.

Lower "BlockSize" values reduce memory consumption somewhat with corresponding throughput penalties.

  my $driver = POE::Driver::SysRW->new;
  my $driver = POE::Driver::SysRW->new( BlockSize => $block_size );

Drivers are commonly instantiated within POE::Wheel constructor calls:

  $_[HEAP]{wheel} = POE::Wheel::ReadWrite->new(
    InputHandle => \*STDIN,
    OutputHandle => \*STDOUT,
    Driver => POE::Driver::SysRW->new(),
    Filter => POE::Filter::Line->new(),
  );

Applications almost always use POE::Driver::SysRW, so POE::Wheel objects almost always will create their own if no Driver is specified.

All Other Methods

POE::Driver::SysRW documents the abstract interface documented in POE::Driver. Please see POE::Driver for more details about the following methods:

flush
get
get_out_messages_buffered
put

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