| Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/C/Linux/include/linux/ (Open Source Betriebssystem Version 6.17.9©) Datei vom 24.10.2025 mit Größe 2 kB |
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SSL hung_task.h Sprache: C |
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/* SPDX-License-Identifier: GPL-2.0-only */
/* * Detect Hung Task: detecting tasks stuck in D state * * Copyright (C) 2025 Tongcheng Travel (www.ly.com) * Author: Lance Yang <mingzhe.yang@ly.com> */ #ifndef __LINUX_HUNG_TASK_H #define __LINUX_HUNG_TASK_H #include <linux/bug.h> #include <linux/sched.h> #include <linux/compiler.h> /* * @blocker: Combines lock address and blocking type. * * Since lock pointers are at least 4-byte aligned(32-bit) or 8-byte * aligned(64-bit). This leaves the 2 least bits (LSBs) of the pointer * always zero. So we can use these bits to encode the specific blocking * type. * * Note that on architectures where this is not guaranteed, or for any * unaligned lock, this tracking mechanism is silently skipped for that * lock. * * Type encoding: * 00 - Blocked on mutex (BLOCKER_TYPE_MUTEX) * 01 - Blocked on semaphore (BLOCKER_TYPE_SEM) * 10 - Blocked on rw-semaphore as READER (BLOCKER_TYPE_RWSEM_READER) * 11 - Blocked on rw-semaphore as WRITER (BLOCKER_TYPE_RWSEM_WRITER) */ #define BLOCKER_TYPE_MUTEX 0x00UL #define BLOCKER_TYPE_SEM 0x01UL #define BLOCKER_TYPE_RWSEM_READER 0x02UL #define BLOCKER_TYPE_RWSEM_WRITER 0x03UL #define BLOCKER_TYPE_MASK 0x03UL #ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER static inline void hung_task_set_blocker(void *lock, unsigned long type) { unsigned long lock_ptr = (unsigned long)lock; WARN_ON_ONCE(!lock_ptr); WARN_ON_ONCE(READ_ONCE(current->blocker)); /* * If the lock pointer matches the BLOCKER_TYPE_MASK, return * without writing anything. */ if (lock_ptr & BLOCKER_TYPE_MASK) return; WRITE_ONCE(current->blocker, lock_ptr | type); } static inline void hung_task_clear_blocker(void) { WRITE_ONCE(current->blocker, 0UL); } /* * hung_task_get_blocker_type - Extracts blocker type from encoded blocker * address. * * @blocker: Blocker pointer with encoded type (via LSB bits) * * Returns: BLOCKER_TYPE_MUTEX, BLOCKER_TYPE_SEM, etc. */ static inline unsigned long hung_task_get_blocker_type(unsigned long blocker) { WARN_ON_ONCE(!blocker); return blocker & BLOCKER_TYPE_MASK; } static inline void *hung_task_blocker_to_lock(unsigned long blocker) { WARN_ON_ONCE(!blocker); return (void *)(blocker & ~BLOCKER_TYPE_MASK); } #else static inline void hung_task_set_blocker(void *lock, unsigned long type) { } static inline void hung_task_clear_blocker(void) { } static inline unsigned long hung_task_get_blocker_type(unsigned long blocker) { return 0UL; } static inline void *hung_task_blocker_to_lock(unsigned long blocker) { return NULL; } #endif #endif /* __LINUX_HUNG_TASK_H */ ¤ Dauer der Verarbeitung: 0.10 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28