9958c351ee
This adds to aio.c a platform-independent API based on EventNotifiers, that can be used by both POSIX and Win32. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
87 lines
2.8 KiB
C
87 lines
2.8 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"
|
|
#include "event_notifier.h"
|
|
|
|
typedef struct BlockDriverAIOCB BlockDriverAIOCB;
|
|
typedef void BlockDriverCompletionFunc(void *opaque, int ret);
|
|
|
|
typedef struct AIOPool {
|
|
void (*cancel)(BlockDriverAIOCB *acb);
|
|
int aiocb_size;
|
|
BlockDriverAIOCB *free_aiocb;
|
|
} AIOPool;
|
|
|
|
struct BlockDriverAIOCB {
|
|
AIOPool *pool;
|
|
BlockDriverState *bs;
|
|
BlockDriverCompletionFunc *cb;
|
|
void *opaque;
|
|
BlockDriverAIOCB *next;
|
|
};
|
|
|
|
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
|
void qemu_aio_release(void *p);
|
|
|
|
/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
|
|
typedef int (AioFlushEventNotifierHandler)(EventNotifier *e);
|
|
|
|
/* 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.
|
|
*
|
|
* Return whether there is still any pending AIO operation. */
|
|
bool qemu_aio_wait(void);
|
|
|
|
#ifdef CONFIG_POSIX
|
|
/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
|
|
typedef int (AioFlushHandler)(void *opaque);
|
|
|
|
/* 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].
|
|
*/
|
|
void qemu_aio_set_fd_handler(int fd,
|
|
IOHandler *io_read,
|
|
IOHandler *io_write,
|
|
AioFlushHandler *io_flush,
|
|
void *opaque);
|
|
#endif
|
|
|
|
/* Register an event notifier and associated callbacks. Behaves very similarly
|
|
* to event_notifier_set_handler. Unlike event_notifier_set_handler, 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 event_notifier_set_handler.
|
|
*/
|
|
void qemu_aio_set_event_notifier(EventNotifier *notifier,
|
|
EventNotifierHandler *io_read,
|
|
AioFlushEventNotifierHandler *io_flush);
|
|
|
|
#endif
|