FreeBSD/Linux Kernel Cross Reference
sys/kernel/mutex.h

     /*
      * Mutexes: blocking mutual exclusion locks
      *
      * started by Ingo Molnar:
      *
      *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
      *
      * This file contains mutex debugging related internal prototypes, for the
      * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
     */
    
    #define spin_lock_mutex(lock, flags) \
                    do { spin_lock(lock); (void)(flags); } while (0)
    #define spin_unlock_mutex(lock, flags) \
                    do { spin_unlock(lock); (void)(flags); } while (0)
    #define mutex_remove_waiter(lock, waiter, ti) \
                    __list_del((waiter)->list.prev, (waiter)->list.next)
    
    #ifdef CONFIG_SMP
    static inline void mutex_set_owner(struct mutex *lock)
    {
            lock->owner = current;
    }
    
    static inline void mutex_clear_owner(struct mutex *lock)
    {
            lock->owner = NULL;
    }
    #else
    static inline void mutex_set_owner(struct mutex *lock)
    {
    }
    
    static inline void mutex_clear_owner(struct mutex *lock)
    {
    }
    #endif
    
    #define debug_mutex_wake_waiter(lock, waiter)           do { } while (0)
    #define debug_mutex_free_waiter(waiter)                 do { } while (0)
    #define debug_mutex_add_waiter(lock, waiter, ti)        do { } while (0)
    #define debug_mutex_unlock(lock)                        do { } while (0)
    #define debug_mutex_init(lock, name, key)               do { } while (0)
    
    static inline void
    debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
    {
    }

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