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