root / qemu-aio.h @ 9c22a623
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1 | a76bab49 | aliguori | /*
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2 | a76bab49 | aliguori | * QEMU aio implementation
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3 | a76bab49 | aliguori | *
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4 | a76bab49 | aliguori | * Copyright IBM, Corp. 2008
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5 | a76bab49 | aliguori | *
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6 | a76bab49 | aliguori | * Authors:
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7 | a76bab49 | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | a76bab49 | aliguori | *
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9 | a76bab49 | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | a76bab49 | aliguori | * the COPYING file in the top-level directory.
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11 | a76bab49 | aliguori | *
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12 | a76bab49 | aliguori | */
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13 | a76bab49 | aliguori | |
14 | a76bab49 | aliguori | #ifndef QEMU_AIO_H
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15 | a76bab49 | aliguori | #define QEMU_AIO_H
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16 | a76bab49 | aliguori | |
17 | a76bab49 | aliguori | #include "qemu-common.h" |
18 | a76bab49 | aliguori | #include "qemu-char.h" |
19 | a76bab49 | aliguori | |
20 | a76bab49 | aliguori | /* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
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21 | a76bab49 | aliguori | typedef int (AioFlushHandler)(void *opaque); |
22 | a76bab49 | aliguori | |
23 | a76bab49 | aliguori | /* Flush any pending AIO operation. This function will block until all
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24 | a76bab49 | aliguori | * outstanding AIO operations have been completed or cancelled. */
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25 | a76bab49 | aliguori | void qemu_aio_flush(void); |
26 | a76bab49 | aliguori | |
27 | a76bab49 | aliguori | /* Wait for a single AIO completion to occur. This function will until a
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28 | a76bab49 | aliguori | * single AIO opeartion has completed. It is intended to be used as a looping
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29 | a76bab49 | aliguori | * primative when simulating synchronous IO based on asynchronous IO. */
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30 | a76bab49 | aliguori | void qemu_aio_wait(void); |
31 | a76bab49 | aliguori | |
32 | a76bab49 | aliguori | /* Register a file descriptor and associated callbacks. Behaves very similarly
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33 | a76bab49 | aliguori | * to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
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34 | a76bab49 | aliguori | * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
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35 | a76bab49 | aliguori | *
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36 | a76bab49 | aliguori | * Code that invokes AIO completion functions should rely on this function
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37 | a76bab49 | aliguori | * instead of qemu_set_fd_handler[2].
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38 | a76bab49 | aliguori | */
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39 | a76bab49 | aliguori | int qemu_aio_set_fd_handler(int fd, |
40 | a76bab49 | aliguori | IOHandler *io_read, |
41 | a76bab49 | aliguori | IOHandler *io_write, |
42 | a76bab49 | aliguori | AioFlushHandler *io_flush, |
43 | a76bab49 | aliguori | void *opaque);
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44 | a76bab49 | aliguori | |
45 | a76bab49 | aliguori | #endif |