io_uring/wait.h

Source file repositories/reference/linux-study-clean/io_uring/wait.h

File Facts

System
Linux kernel
Corpus path
io_uring/wait.h
Extension
.h
Size
1567 bytes
Lines
56
Domain
Kernel Services
Bucket
io_uring
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ext_arg {
	size_t argsz;
	struct timespec64 ts;
	const sigset_t __user *sig;
	ktime_t min_time;
	bool ts_set;
	bool iowait;
};

int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
		   struct ext_arg *ext_arg);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
void io_cqring_do_overflow_flush(struct io_ring_ctx *ctx);
void io_cqring_overflow_flush_locked(struct io_ring_ctx *ctx);

static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx)
{
	struct io_rings *rings = io_get_rings(ctx);
	return ctx->cached_cq_tail - READ_ONCE(rings->cq.head);
}

static inline unsigned int __io_cqring_events_user(struct io_ring_ctx *ctx)
{
	struct io_rings *rings = io_get_rings(ctx);

	return READ_ONCE(rings->cq.tail) - READ_ONCE(rings->cq.head);
}

/*
 * Reads the tail/head of the CQ ring while providing an acquire ordering,
 * see comment at top of io_uring.c.
 */
static inline unsigned io_cqring_events(struct io_ring_ctx *ctx)
{
	smp_rmb();
	return __io_cqring_events(ctx);
}

#endif

Annotation

Implementation Notes