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68396ea @rmustacc Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm
rmustacc authored
1 /*
2 * QEMU aio implementation
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #ifndef QEMU_AIO_H
15 #define QEMU_AIO_H
16
17 #include "qemu-common.h"
18 #include "qemu-char.h"
19
20 /* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
21 typedef int (AioFlushHandler)(void *opaque);
22
23 /* Runs all currently allowed AIO callbacks of completed requests in the
24 * respective AIO backend. Returns 0 if no requests was handled, non-zero
25 * if at least one queued request was handled. */
26 typedef int (AioProcessQueue)(void *opaque);
27
28 /* Flush any pending AIO operation. This function will block until all
29 * outstanding AIO operations have been completed or cancelled. */
30 void qemu_aio_flush(void);
31
32 /* Wait for a single AIO completion to occur. This function will wait
33 * until a single AIO event has completed and it will ensure something
34 * has moved before returning. This can issue new pending aio as
35 * result of executing I/O completion or bh callbacks. */
36 void qemu_aio_wait(void);
37
38 /*
39 * Runs all currently allowed AIO callbacks of completed requests. Returns 0
40 * if no requests were handled, non-zero if at least one request was
41 * processed.
42 */
43 int qemu_aio_process_queue(void);
44
45 /* Register a file descriptor and associated callbacks. Behaves very similarly
46 * to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
47 * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
48 *
49 * Code that invokes AIO completion functions should rely on this function
50 * instead of qemu_set_fd_handler[2].
51 */
52 int qemu_aio_set_fd_handler(int fd,
53 IOHandler *io_read,
54 IOHandler *io_write,
55 AioFlushHandler *io_flush,
56 AioProcessQueue *io_process_queue,
57 void *opaque);
58
59 #endif
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