• aliguori's avatar
    Introduce a buffered file wrapper for QEMUFile · 39b65c2e
    aliguori authored
    This patch introduces a buffered QEMUFile wrapper.  This allows QEMUFile's to be
    rate limited.  It also makes it easier to implement a QEMUFile that is
    asynchronous since the current QEMUFile API requires that all reads and writes
    be synchronous.
    
    The only real non-obvious part of the API is the "frozen" concept.  If the
    backend returns EAGAIN, the QEMUFile is said to be "frozen".  This means no
    additional output will be sent to the backend until the file is unfrozen.
    qemu_file_put_notify can be used to unfreeze a frozen file.
    
    A synchronous interface is also provided to wait for an unfreeze event.  This is
    used during the final part of live migration when the VM is no longer running.
    Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5475 c046a42c-6fe2-441c-8c8c-71466251a162
    39b65c2e
buffered_file.c 5.73 KB