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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172/* SPDX-License-Identifier: GPL-2.0 */#ifndef __LINUX_MUTEX_TYPES_H#define __LINUX_MUTEX_TYPES_H
#include <linux/atomic.h>#include <linux/lockdep_types.h>#include <linux/osq_lock.h>#include <linux/spinlock_types.h>#include <linux/types.h>
#ifndef CONFIG_PREEMPT_RT
/* * Simple, straightforward mutexes with strict semantics: * * - only one task can hold the mutex at a time * - only the owner can unlock the mutex * - multiple unlocks are not permitted * - recursive locking is not permitted * - a mutex object must be initialized via the API * - a mutex object must not be initialized via memset or copying * - task may not exit with mutex held * - memory areas where held locks reside must not be freed * - held mutexes must not be reinitialized * - mutexes may not be used in hardware or software interrupt * contexts such as tasklets and timers * * These semantics are fully enforced when DEBUG_MUTEXES is * enabled. Furthermore, besides enforcing the above rules, the mutex * debugging code also implements a number of additional features * that make lock debugging easier and faster: * * - uses symbolic names of mutexes, whenever they are printed in debug output * - point-of-acquire tracking, symbolic lookup of function names * - list of all locks held in the system, printout of them * - owner tracking * - detects self-recursing locks and prints out all relevant info * - detects multi-task circular deadlocks and prints out all affected * locks and tasks (and only those tasks) */context_lock_struct(mutex) { atomic_long_t owner; raw_spinlock_t wait_lock;#ifdef CONFIG_MUTEX_SPIN_ON_OWNER struct optimistic_spin_queue osq; /* Spinner MCS lock */#endif struct mutex_waiter *first_waiter __guarded_by(&wait_lock);#ifdef CONFIG_DEBUG_MUTEXES void *magic;#endif#ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map;#endif};
#else /* !CONFIG_PREEMPT_RT *//* * Preempt-RT variant based on rtmutexes. */#include <linux/rtmutex.h>
context_lock_struct(mutex) { struct rt_mutex_base rtmutex;#ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map;#endif};
#endif /* CONFIG_PREEMPT_RT */
#endif /* __LINUX_MUTEX_TYPES_H */