mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 20:19:44 +00:00
8febfa2684
We'll leave some AIO completions unhandled when we can't call the callback. qemu_aio_process_queue() is used later to run any callbacks that are left and can be run then. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/*
|
|
* QEMU aio implementation
|
|
*
|
|
* Copyright IBM, Corp. 2008
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_AIO_H
|
|
#define QEMU_AIO_H
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu-char.h"
|
|
|
|
/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
|
|
typedef int (AioFlushHandler)(void *opaque);
|
|
|
|
/* Runs all currently allowed AIO callbacks of completed requests in the
|
|
* respective AIO backend. Returns 0 if no requests was handled, non-zero
|
|
* if at least one queued request was handled. */
|
|
typedef int (AioProcessQueue)(void *opaque);
|
|
|
|
/* Flush any pending AIO operation. This function will block until all
|
|
* outstanding AIO operations have been completed or cancelled. */
|
|
void qemu_aio_flush(void);
|
|
|
|
/* Wait for a single AIO completion to occur. This function will wait
|
|
* until a single AIO event has completed and it will ensure something
|
|
* has moved before returning. This can issue new pending aio as
|
|
* result of executing I/O completion or bh callbacks. */
|
|
void qemu_aio_wait(void);
|
|
|
|
/*
|
|
* Runs all currently allowed AIO callbacks of completed requests. Returns 0
|
|
* if no requests were handled, non-zero if at least one request was
|
|
* processed.
|
|
*/
|
|
int qemu_aio_process_queue(void);
|
|
|
|
/* Register a file descriptor and associated callbacks. Behaves very similarly
|
|
* to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
|
|
* be invoked when using either qemu_aio_wait() or qemu_aio_flush().
|
|
*
|
|
* Code that invokes AIO completion functions should rely on this function
|
|
* instead of qemu_set_fd_handler[2].
|
|
*/
|
|
int qemu_aio_set_fd_handler(int fd,
|
|
IOHandler *io_read,
|
|
IOHandler *io_write,
|
|
AioFlushHandler *io_flush,
|
|
AioProcessQueue *io_process_queue,
|
|
void *opaque);
|
|
|
|
#endif
|