Annotation of qemu/qemu-aio.h, revision 1.1.1.1

1.1       root        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 until a
                     28:  * single AIO opeartion has completed.  It is intended to be used as a looping
                     29:  * primative when simulating synchronous IO based on asynchronous IO. */
                     30: void qemu_aio_wait(void);
                     31: 
                     32: /* Register a file descriptor and associated callbacks.  Behaves very similarly
                     33:  * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
                     34:  * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
                     35:  *
                     36:  * Code that invokes AIO completion functions should rely on this function
                     37:  * instead of qemu_set_fd_handler[2].
                     38:  */
                     39: int qemu_aio_set_fd_handler(int fd,
                     40:                             IOHandler *io_read,
                     41:                             IOHandler *io_write,
                     42:                             AioFlushHandler *io_flush,
                     43:                             void *opaque);
                     44: 
                     45: #endif

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