io_uring/futex.h

File Facts

System

Linux kernel

Corpus path

io_uring/futex.h

Extension

.h

Size

1183 bytes

Lines

38

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.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• cancel.h

Detected Declarations

• function io_futex_cancel
• function io_futex_remove_all
• function io_futex_cache_init
• function io_futex_cache_free

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include "cancel.h"

int io_futex_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_futexv_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_futex_wait(struct io_kiocb *req, unsigned int issue_flags);
int io_futexv_wait(struct io_kiocb *req, unsigned int issue_flags);
int io_futex_wake(struct io_kiocb *req, unsigned int issue_flags);

#if defined(CONFIG_FUTEX)
int io_futex_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
		    unsigned int issue_flags);
bool io_futex_remove_all(struct io_ring_ctx *ctx, struct io_uring_task *tctx,
			 bool cancel_all);
bool io_futex_cache_init(struct io_ring_ctx *ctx);
void io_futex_cache_free(struct io_ring_ctx *ctx);
#else
static inline int io_futex_cancel(struct io_ring_ctx *ctx,
				  struct io_cancel_data *cd,
				  unsigned int issue_flags)
{
	return 0;
}
static inline bool io_futex_remove_all(struct io_ring_ctx *ctx,
				       struct io_uring_task *tctx, bool cancel_all)
{
	return false;
}
static inline bool io_futex_cache_init(struct io_ring_ctx *ctx)
{
	return false;
}
static inline void io_futex_cache_free(struct io_ring_ctx *ctx)
{
}
#endif

Annotation

• Immediate include surface: `cancel.h`.
• Detected declarations: `function io_futex_cancel`, `function io_futex_remove_all`, `function io_futex_cache_init`, `function io_futex_cache_free`.
• Atlas domain: Kernel Services / io_uring.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.