kernel/locking/rwbase_rt.c

File Facts

System

Linux kernel

Corpus path

kernel/locking/rwbase_rt.c

Extension

.c

Size

8769 bytes

Lines

311

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• function tasks
• function __rwbase_read_lock
• function rwbase_read_lock
• function __rwbase_read_unlock
• function rwbase_read_unlock
• function __rwbase_write_unlock
• function rwbase_write_unlock
• function rwbase_write_downgrade
• function __rwbase_write_trylock
• function rwbase_read_unlock
• function rwbase_write_lock
• function rwbase_write_trylock

Annotated Snippet

if (rwbase_signal_pending_state(state, current)) {
			rwbase_restore_current_state();
			__rwbase_write_unlock(rwb, 0, flags);
			rwbase_post_schedule();
			trace_contention_end(rwb, -EINTR);
			return -EINTR;
		}

		if (__rwbase_write_trylock(rwb))
			break;

		raw_spin_unlock_irqrestore(&rtm->wait_lock, flags);
		rwbase_schedule();
		raw_spin_lock_irqsave(&rtm->wait_lock, flags);

		set_current_state(state);
	}
	rwbase_restore_current_state();
	trace_contention_end(rwb, 0);

out_unlock:
	raw_spin_unlock_irqrestore(&rtm->wait_lock, flags);
	rwbase_post_schedule();
	return 0;
}

static inline int rwbase_write_trylock(struct rwbase_rt *rwb)
{
	struct rt_mutex_base *rtm = &rwb->rtmutex;
	unsigned long flags;

	if (!rwbase_rtmutex_trylock(rtm))
		return 0;

	atomic_sub(READER_BIAS, &rwb->readers);

	raw_spin_lock_irqsave(&rtm->wait_lock, flags);
	if (__rwbase_write_trylock(rwb)) {
		raw_spin_unlock_irqrestore(&rtm->wait_lock, flags);
		return 1;
	}
	__rwbase_write_unlock(rwb, 0, flags);
	return 0;
}

Annotation

• Detected declarations: `function tasks`, `function __rwbase_read_lock`, `function rwbase_read_lock`, `function __rwbase_read_unlock`, `function rwbase_read_unlock`, `function __rwbase_write_unlock`, `function rwbase_write_unlock`, `function rwbase_write_downgrade`, `function __rwbase_write_trylock`, `function rwbase_read_unlock`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.