• Make 'print' and 'say' stringify the same way. (See  http://rt.perl.org/rt3/Ticket/Display.html?id=55196)

• Change 'fprintf' to 'PIO_fprintf' where relevant.

• Plain %s in parrot printf-alike functions do not handle NULL C strings well. Fix.

IO PMCs

• Create an abstract "IOHandle" class

• Abstract relevant API code from FileHandle and Socket into IOHandle

• Separate pipe-related logic out of FileHandle

• Fix StringHandle to be a proper subclass of IOHandle

• Create a "Select" PMC

• Use roles and VTABLE_does to differentiate capabilities of different PMC types.

Ideas

• Create "StreamDescriptor" PMC type to abstract out system-dependent IO descriptors. Would allow FileHandles and Sockets to be subclassed more easily

• Create a "StreamBuffer" PMC type to abstract out buffering details. Would allow FileHandles and Sockets to be subclassed more easily, and give all IO types easy access to buffering

IO API

• Change IO API to not use PCCINVOKE calls

Asynchronous IO

various IO related RT tickets

•  http://rt.perl.org/rt3/Ticket/Display.html?id=41353
•  http://rt.perl.org/rt3/Ticket/Display.html?id=46413
•  http://rt.perl.org/rt3/Ticket/Display.html?id=46841
•  http://rt.perl.org/rt3/Ticket/Display.html?id=46843

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Completed:

• Rip out the layers structures and macros. (After the migration is complete.)

• Remove src/io/io_mmap.c, unused and not useful.

• Convert I/O layers to I/O objects. (allison)

• src/io/io_unix.c is the guts of most I/O on most platforms. src/io/io_win32.c is Windows. src/io/io_stdio.c is STDIN, STDOUT, and STDERR. These three need to be ported to the new system. (allison)

• src/io/io_utf8.c is really the wrong way to go about it. Filehandles should be marked with character set and encoding similar to strings. (allison)

• Create a PMC named "FileHandle", as a core file handle object, which can be subclassed by various HLLs. (allison)

• Continue to support different I/O operations on different platforms, using C '#ifdef's on platform-specific sections. (allison)

• All 'PIO_*' functions change to 'Parrot_io_*'. (Since the implementation is completely changing, better to create new functions with the new names than to change the names of existing functions.) (allison)

• Remove deprecated opcode 'pioctl', and fix related documentation. (See  http://rt.perl.org/rt3/Ticket/Display.html?id=48589)

• Decide if we plan to use AIO before the 1.0 release. (See  http://rt.perl.org/rt3/Ticket/Display.html?id=57920)

• Remove src/io/io_passdown.c and src/io/io_layers.c, purely implementation artifacts of I/O layers implementation.

• Change src/io/io_string.c to a subclass of FileHandle PMC, that provides the same interface, but to a string instead of a file handle.