• aliguori's avatar
    Refactor AIO to allow multiple AIO implementations · a76bab49
    aliguori authored
    This patch refactors the AIO layer to allow multiple AIO implementations.  It's
    only possible because of the recent signalfd() patch.  
    
    Right now, the AIO infrastructure is pretty specific to the block raw backend.
    For other block devices to implement AIO, the qemu_aio_wait function must
    support registration.  This patch introduces a new function,
    qemu_aio_set_fd_handler, which can be used to register a file descriptor to be
    called back.  qemu_aio_wait() now polls a set of file descriptors registered
    with this function until one becomes readable or writable.
    
    This patch should allow the implementation of alternative AIO backends (via a
    thread pool or linux-aio) and AIO backends in non-traditional block devices
    (like NBD).
    Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5297 c046a42c-6fe2-441c-8c8c-71466251a162
    a76bab49
qemu-aio.h 1.43 KB