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lib/mutex: return zero on get_ceiling() in non-PP case 

This is a simple way to figure out the protocol of a mutex without
crippling the API with trivial accessors people might need twice a
century.
This commit is contained in:
Philippe Gerum 2019-08-24 12:37:06 +02:00
parent bed2532942
commit 672bc22c7c
1 changed files with 5 additions and 4 deletions
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9
lib/mutex.c
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@ -385,17 +385,18 @@ int evl_set_mutex_ceiling(struct evl_mutex *mutex,
int evl_get_mutex_ceiling(struct evl_mutex *mutex)
{
if (mutex->magic == __MUTEX_UNINIT_MAGIC) {
if (mutex->uninit.monitor != EVL_MONITOR_GATE ||
mutex->uninit.ceiling == 0)
if (mutex->uninit.monitor != EVL_MONITOR_GATE)
return -EINVAL;
return mutex->uninit.ceiling;
}
if (mutex->magic != __MUTEX_ACTIVE_MAGIC ||
mutex->active.monitor != EVL_MONITOR_GATE ||
mutex->active.protocol != EVL_GATE_PP)
mutex->active.monitor != EVL_MONITOR_GATE)
return -EINVAL;
if (mutex->active.protocol != EVL_GATE_PP)
return 0;
return mutex->active.state->u.gate.ceiling;
}