include/linux/sem.h

File Facts

System

Linux kernel

Corpus path

include/linux/sem.h

Extension

.h

Size

495 bytes

Lines

29

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• uapi/linux/sem.h
• linux/sem_types.h

Detected Declarations

• struct task_struct
• function copy_semundo
• function exit_sem

Annotated Snippet

#ifndef _LINUX_SEM_H
#define _LINUX_SEM_H

#include <uapi/linux/sem.h>
#include <linux/sem_types.h>

struct task_struct;

#ifdef CONFIG_SYSVIPC

extern int copy_semundo(u64 clone_flags, struct task_struct *tsk);
extern void exit_sem(struct task_struct *tsk);

#else

static inline int copy_semundo(u64 clone_flags, struct task_struct *tsk)
{
	return 0;
}

static inline void exit_sem(struct task_struct *tsk)
{
	return;
}
#endif

#endif /* _LINUX_SEM_H */

Annotation

• Immediate include surface: `uapi/linux/sem.h`, `linux/sem_types.h`.
• Detected declarations: `struct task_struct`, `function copy_semundo`, `function exit_sem`.
• Atlas domain: Core OS / Core Kernel Interface.
• 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.