File:  [Qemu by Fabrice Bellard] / qemu / qemu-aio.h
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:20:31 2018 UTC (3 years, 5 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0111, qemu0110, HEAD
qemu 0.11.0

    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: /* Flush any pending AIO operation. This function will block until all
   24:  * outstanding AIO operations have been completed or cancelled. */
   25: void qemu_aio_flush(void);
   26: 
   27: /* Wait for a single AIO completion to occur.  This function will wait
   28:  * until a single AIO event has completed and it will ensure something
   29:  * has moved before returning. This can issue new pending aio as
   30:  * result of executing I/O completion or bh callbacks. */
   31: void qemu_aio_wait(void);
   32: 
   33: /* Register a file descriptor and associated callbacks.  Behaves very similarly
   34:  * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
   35:  * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
   36:  *
   37:  * Code that invokes AIO completion functions should rely on this function
   38:  * instead of qemu_set_fd_handler[2].
   39:  */
   40: int qemu_aio_set_fd_handler(int fd,
   41:                             IOHandler *io_read,
   42:                             IOHandler *io_write,
   43:                             AioFlushHandler *io_flush,
   44:                             void *opaque);
   45: 
   46: #endif

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