linux-4.4.1/mutex の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/mutex へ行く。
• linux-4.4.1/mutex の差分を削除

*参照元 [#w2465e4a]
#backlinks

*説明 [#t1051952]
-パス: [[linux-4.4.1/include/linux/mutex.h]]

-FIXME: これは何？
--説明


**参考 [#y38b9d76]


*実装 [#zf202dc0]
 /*
  * 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)
  */
 struct mutex {
         /* 1: unlocked, 0: locked, negative: locked, possible waiters */
         atomic_t                count;
-
--[[linux-4.4.1/atomic_t]]

         spinlock_t              wait_lock;
-
--[[linux-4.4.1/spinlock_t]]

         struct list_head        wait_list;
-
--[[linux-4.4.1/list_head]]

 #if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)
-
--[[linux-4.4.1/CONFIG_DEBUG_MUTEXES]]
--[[linux-4.4.1/CONFIG_MUTEX_SPIN_ON_OWNER]]

         struct task_struct      *owner;
-
--[[linux-4.4.1/task_struct]]

 #endif
 #ifdef CONFIG_MUTEX_SPIN_ON_OWNER
         struct optimistic_spin_queue osq; /* Spinner MCS lock */
-
--[[linux-4.4.1/optimistic_spin_queue]]

 #endif
 #ifdef CONFIG_DEBUG_MUTEXES
         void                    *magic;
 #endif
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
-
--[[linux-4.4.1/CONFIG_DEBUG_LOCK_ALLOC]]

         struct lockdep_map      dep_map;
-
--[[linux-4.4.1/lockdep_map]]

 #endif
 };


*コメント [#d51290ea]