include/block/aio.h

10  * the COPYING file in the top-level directory.
20 #include "qemu/coroutine-core.h"
26 #include "block/graph-lock.h"
27 #include "hw/qdev-core.h"
76      * Called with ctx->list_lock acquired.
88      * Called with ctx->list_lock incremented but not locked.
98      * Tell aio_poll() when to stop userspace polling early because ->wait()
106      * Returns: true if ->wait() should be called, false otherwise.
133     /* Used by AioContext users to protect from multi-threaded access.  */
144     /* The list of registered AIO handlers.  Protected by ctx->list_lock. */
147     /* The list of AIO handlers to be deleted.  Protected by ctx->list_lock. */
156      * timers) will be re-evaluated before the next blocking poll() or
158      * skipped.  If it is non-zero, you may need to wake up a concurrent
164      * Bits 1-31 simply count the number of active calls to aio_poll
171      * play safe and allow it---it will just cause extra calls to
185     /* Bottom Halves pending aio_bh_poll() processing */
195      * is going to clear "notified" before processing more events.  False
227     /* TimerLists for calling timers - one per clock type.  Has its own
240     /* AIO engine parameters */
245      * ctx->list_lock.  Iterated and modified mostly by the event loop thread
246      * from aio_poll() with ctx->list_lock incremented.  aio_set_fd_handler()
247      * only touches the list to delete nodes if ctx->list_lock's count is zero.
263  * AioContext provide a mini event-loop that can be waited on synchronously.
289  * @name: A human-readable identifier for debugging purposes.
308  * to be wait-free, thread-safe and signal-safe.  The #QEMUBH structure
311  * @name: A human-readable identifier for debugging purposes.
313  * device-reentrancy issues
338  * aio_notify: Force processing of pending events.
341  * aio_poll to exit, so that the next call will re-examine pending events.
361  * be done before processing all events (file descriptors, bottom halves,
403  * itself is also wait-free and thread-safe, it can of course race with the
543     return timer_new_full(&ctx->tlg, type, scale, attributes, cb, opaque);  in aio_timer_new_with_attrs()
563     return timer_new_full(&ctx->tlg, type, scale, 0, cb, opaque);  in aio_timer_new()
585     timer_init_full(ts, &ctx->tlg, type, scale, attributes, cb, opaque);  in aio_timer_init_with_attrs()
605     timer_init_full(ts, &ctx->tlg, type, scale, 0, cb, opaque);  in aio_timer_init()
650  * aio_co_wake may be executed either in coroutine or non-coroutine
715  *             engine will use its default