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rtems-bsd-mutex: Optimize

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Inline SMP lock acquire/release.  Avoid stack frame for hot path.
This commit is contained in:
Sebastian Huber 2016-11-09 08:53:20 +01:00
parent 617dc0f5a1
commit 8b0bcb88e0
1 changed files with 52 additions and 11 deletions
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63
rtemsbsd/include/machine/rtems-bsd-muteximpl.h
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@ -71,25 +71,62 @@ void rtems_bsd_mutex_lock_more(struct lock_object *lock, rtems_bsd_mutex *m,
Thread_Control *owner, Thread_Control *executing,
Thread_queue_Context *queue_context);
#define rtems_bsd_mutex_isr_disable(isr_level, queue_context) \
do { \
_ISR_Local_disable(isr_level); \
_ISR_lock_ISR_disable_profile( \
&(queue_context)->Lock_context.Lock_context) \
} while (0)
static inline void
rtems_bsd_mutex_acquire_critical(rtems_bsd_mutex *m,
Thread_queue_Context *queue_context)
{
_Thread_queue_Queue_acquire_critical(&m->queue.Queue,
&m->queue.Lock_stats, &queue_context->Lock_context.Lock_context);
}
static inline void
rtems_bsd_mutex_release(rtems_bsd_mutex *m, ISR_Level isr_level,
Thread_queue_Context *queue_context)
{
_Thread_queue_Queue_release_critical(&m->queue.Queue,
&queue_context->Lock_context.Lock_context);
_ISR_Local_enable(isr_level);
}
static inline void
rtems_bsd_mutex_set_isr_level(Thread_queue_Context *queue_context,
ISR_Level isr_level)
{
_ISR_lock_Context_set_level(&queue_context->Lock_context.Lock_context,
isr_level);
}
static inline void
rtems_bsd_mutex_lock(struct lock_object *lock, rtems_bsd_mutex *m)
{
ISR_Level isr_level;
Thread_queue_Context queue_context;
Thread_Control *executing;
Thread_Control *owner;
_Thread_queue_Context_initialize(&queue_context);
_Thread_queue_Acquire(&m->queue, &queue_context);
rtems_bsd_mutex_isr_disable(isr_level, &queue_context);
executing = _Thread_Executing;
rtems_bsd_mutex_acquire_critical(m, &queue_context);
owner = m->queue.Queue.owner;
executing = _Thread_Executing;
if (__predict_true(owner == NULL)) {
m->queue.Queue.owner = executing;
_Thread_Resource_count_increment(executing);
_Thread_queue_Release(&m->queue, &queue_context);
rtems_bsd_mutex_release(m, isr_level, &queue_context);
} else {
rtems_bsd_mutex_set_isr_level(&queue_context, isr_level);
rtems_bsd_mutex_lock_more(lock, m, owner, executing,
&queue_context);
}
@ -99,15 +136,17 @@ static inline int
rtems_bsd_mutex_trylock(struct lock_object *lock, rtems_bsd_mutex *m)
{
int success;
ISR_Level isr_level;
Thread_queue_Context queue_context;
Thread_Control *executing;
Thread_Control *owner;
_Thread_queue_Context_initialize(&queue_context);
_Thread_queue_Acquire(&m->queue, &queue_context);
rtems_bsd_mutex_isr_disable(isr_level, &queue_context);
executing = _Thread_Executing;
rtems_bsd_mutex_acquire_critical(m, &queue_context);
owner = m->queue.Queue.owner;
executing = _Thread_Executing;
if (owner == NULL) {
m->queue.Queue.owner = executing;
@ -121,7 +160,7 @@ rtems_bsd_mutex_trylock(struct lock_object *lock, rtems_bsd_mutex *m)
success = 0;
}
_Thread_queue_Release(&m->queue, &queue_context);
rtems_bsd_mutex_release(m, isr_level, &queue_context);
return (success);
}
@ -129,12 +168,14 @@ rtems_bsd_mutex_trylock(struct lock_object *lock, rtems_bsd_mutex *m)
static inline void
rtems_bsd_mutex_unlock(rtems_bsd_mutex *m)
{
ISR_Level isr_level;
Thread_queue_Context queue_context;
Thread_Control *owner;
int nest_level;
_Thread_queue_Context_initialize(&queue_context);
_Thread_queue_Acquire(&m->queue, &queue_context);
rtems_bsd_mutex_isr_disable(isr_level, &queue_context);
rtems_bsd_mutex_acquire_critical(m, &queue_context);
nest_level = m->nest_level;
owner = m->queue.Queue.owner;
@ -149,15 +190,15 @@ rtems_bsd_mutex_unlock(rtems_bsd_mutex *m)
_Thread_Resource_count_decrement(owner);
if (__predict_true(heads == NULL)) {
_Thread_queue_Release(&m->queue, &queue_context);
rtems_bsd_mutex_release(m, isr_level, &queue_context);
} else {
rtems_bsd_mutex_set_isr_level(&queue_context, isr_level);
_Thread_queue_Surrender(&m->queue.Queue, heads, owner,
&queue_context, RTEMS_BSD_MUTEX_TQ_OPERATIONS);
}
} else {
m->nest_level = nest_level - 1;
_Thread_queue_Release(&m->queue, &queue_context);
rtems_bsd_mutex_release(m, isr_level, &queue_context);
}
}