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* AioContext POSIX event loop implementation internal APIs
* Copyright IBM, Corp. 2008
* Copyright Red Hat, Inc. 2020
* Authors:
* Anthony Liguori <>
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
#ifndef AIO_POSIX_H
#define AIO_POSIX_H
#include "block/aio.h"
struct AioHandler {
GPollFD pfd;
IOHandler *io_read;
IOHandler *io_write;
AioPollFn *io_poll;
IOHandler *io_poll_ready;
IOHandler *io_poll_begin;
IOHandler *io_poll_end;
void *opaque;
QLIST_ENTRY(AioHandler) node;
QLIST_ENTRY(AioHandler) node_ready; /* only used during aio_poll() */
QLIST_ENTRY(AioHandler) node_deleted;
QLIST_ENTRY(AioHandler) node_poll;
QSLIST_ENTRY(AioHandler) node_submitted;
unsigned flags; /* see fdmon-io_uring.c */
int64_t poll_idle_timeout; /* when to stop userspace polling */
bool is_external;
/* Add a handler to a ready list */
void aio_add_ready_handler(AioHandlerList *ready_list, AioHandler *node,
int revents);
extern const FDMonOps fdmon_poll_ops;
bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd);
void fdmon_epoll_setup(AioContext *ctx);
void fdmon_epoll_disable(AioContext *ctx);
static inline bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd)
return false;
static inline void fdmon_epoll_setup(AioContext *ctx)
static inline void fdmon_epoll_disable(AioContext *ctx)
#endif /* !CONFIG_EPOLL_CREATE1 */
bool fdmon_io_uring_setup(AioContext *ctx);
void fdmon_io_uring_destroy(AioContext *ctx);
static inline bool fdmon_io_uring_setup(AioContext *ctx)
return false;
static inline void fdmon_io_uring_destroy(AioContext *ctx)
#endif /* AIO_POSIX_H */