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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: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5475 c046a42c-6fe2-441c-8c8c-71466251a162
31 lines
916 B
C
31 lines
916 B
C
/*
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* QEMU buffered QEMUFile
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_BUFFERED_FILE_H
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#define QEMU_BUFFERED_FILE_H
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#include "hw/hw.h"
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typedef ssize_t (BufferedPutFunc)(void *opaque, const void *data, size_t size);
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typedef void (BufferedPutReadyFunc)(void *opaque);
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typedef void (BufferedWaitForUnfreezeFunc)(void *opaque);
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typedef int (BufferedCloseFunc)(void *opaque);
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QEMUFile *qemu_fopen_ops_buffered(void *opaque, size_t xfer_limit,
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BufferedPutFunc *put_buffer,
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BufferedPutReadyFunc *put_ready,
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BufferedWaitForUnfreezeFunc *wait_for_unfreeze,
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BufferedCloseFunc *close);
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#endif
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