56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IOU_WAIT_H
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#define IOU_WAIT_H
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#include <linux/io_uring_types.h>
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/*
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* ->cq_wait_nr is armed with the number of lazy task_work adds the waiter
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* still needs, and counted down by the add side, with the add reaching zero
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* issuing the (single) wake up for this wait cycle. Zero and below means no
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* wake up is to be issued: IO_CQ_WAKE_INIT when no task is waiting (also
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* what a forced wake up resets it to when claiming one), zero once the
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* countdown has fired.
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*/
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#define IO_CQ_WAKE_INIT (-1)
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struct ext_arg {
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size_t argsz;
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struct timespec64 ts;
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const sigset_t __user *sig;
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ktime_t min_time;
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bool ts_set;
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bool iowait;
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};
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int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
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struct ext_arg *ext_arg);
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int io_run_task_work_sig(struct io_ring_ctx *ctx);
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void io_cqring_do_overflow_flush(struct io_ring_ctx *ctx);
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void io_cqring_overflow_flush_locked(struct io_ring_ctx *ctx);
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static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx)
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{
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struct io_rings *rings = io_get_rings(ctx);
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return ctx->cached_cq_tail - READ_ONCE(rings->cq.head);
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}
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static inline unsigned int __io_cqring_events_user(struct io_ring_ctx *ctx)
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{
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struct io_rings *rings = io_get_rings(ctx);
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return READ_ONCE(rings->cq.tail) - READ_ONCE(rings->cq.head);
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}
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/*
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* Reads the tail/head of the CQ ring while providing an acquire ordering,
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* see comment at top of io_uring.c.
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*/
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static inline unsigned io_cqring_events(struct io_ring_ctx *ctx)
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{
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smp_rmb();
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return __io_cqring_events(ctx);
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}
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#endif
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