This library can work without patching the kernel. Kernel patches are only needed if you want to use POSIX AIO features not available from user-space or to improve performance.

• A lot of fixes both in the library code and the testcases
• Support for listio syscall
• Library is now MT safe
• Kernel patches ported to 2.6.20

• Fixed x86_64 implementation.
• Fixed testcases use of volatile variables

• Merged IO_CMD_EVENT and IO_CMD_CHECKPOINT into IO_CMD_GROUP for listio support.
• Fixed buf type from unsigned char * to char * for gcc4 in check/aio_fsync.c.
• Do not use the aiocb->data to store a pointer to the aiocb. This field was used in update_events() in src/aio_event.c to retrieve the aiocb from the io_event. We can instead use event->obj.
• Added missing comma in aio_syscall4 in src/syscall_x86.h.
• Added --enable-debug option to configure for compiling the library with debug symbols. Changed configure.ac and src/Makefile.am
• Changed __aio_thread_init() to take a sigevent as arg instead of an aiocb.
• Added new listio testcases in check.
• Added support patches for the 2.6.14 kernel including Ben LaHaise's additions for request completion notification.
• Updated support patches for the 2.6.10 and 2.6.12 kernels.

• Fixed compilation errors when none of the kernel patches are applied i.e. no support for AIO and LIO completion signal and no support for io_setup (0, ...).
• Bug fixes concerning buffered AIO support in aio_read and aio_write.
• Fixed the type of the buffer (from unsigned char * to char *) used for the AIO request in a few places in testbed for consistency. These were causing compile time errors under gcc 4.0.
• Bug fix in kernel patches. In sys_io_submit, the iocb address was passed to create_lio instead of whatever the user passed in the sigevent sigev_value.
• Removed automatic checking of kernel support for buffered AIO in configure.ac. The feature must be manually enabled or disabled. Default right now is disabled.
• Added mini testsuite so that doing a `make check` after building the library makes sure everything is in order before installing. Currently the aio_fsync and aio_cancel checks fail due to lack of support from the kernel.
• Added support patches for the 2.6.12 kernel.
• Releases (Library and kernel patches) are now available on Sourceforge.

 The Open Group Base Specifications :

• AIO Rationale
• AIO System Interfaces :
  • aio.h
  • aio_cancel
  • aio_error
  • aio_fsync
  • aio_read
  • aio_return
  • aio_suspend
  • aio_write
  • lio_listio