/*
* mutex_init:
*
* Initialize a mutex for use. Note that adaptive mutexes are in
* essence spin mutexes that can sleep to avoid deadlock and wasting
* CPU time. We can't easily provide a type of mutex that always
* sleeps - see comments in mutex_vector_enter() about releasing
* mutexes unlocked.
*/
void
mutex_init(kmutex_t *mtx, kmutex_type_t type, int ipl)
{
bool dodebug;
memset(mtx, 0, sizeof(*mtx));
switch (type) {
case MUTEX_ADAPTIVE:
KASSERT(ipl == IPL_NONE);
break;
case MUTEX_DEFAULT:
case MUTEX_DRIVER:
if (ipl == IPL_NONE || ipl == IPL_SOFTCLOCK ||
ipl == IPL_SOFTBIO || ipl == IPL_SOFTNET ||
ipl == IPL_SOFTSERIAL) {
type = MUTEX_ADAPTIVE;
} else {
type = MUTEX_SPIN;
}
break;
default:
break;
}
switch (type) {
case MUTEX_NODEBUG:
dodebug = LOCKDEBUG_ALLOC(mtx, NULL,
(uintptr_t)__builtin_return_address(0));
MUTEX_INITIALIZE_SPIN(mtx, dodebug, ipl);
break;
case MUTEX_ADAPTIVE:
dodebug = LOCKDEBUG_ALLOC(mtx, &mutex_adaptive_lockops,
(uintptr_t)__builtin_return_address(0));
MUTEX_INITIALIZE_ADAPTIVE(mtx, dodebug);
break;
case MUTEX_SPIN:
dodebug = LOCKDEBUG_ALLOC(mtx, &mutex_spin_lockops,
(uintptr_t)__builtin_return_address(0));
MUTEX_INITIALIZE_SPIN(mtx, dodebug, ipl);
break;
default:
panic("mutex_init: impossible type");
break;
}
}
/*
* rw_init:
*
* Initialize a rwlock for use.
*/
void
rw_init(krwlock_t *rw)
{
bool dodebug;
memset(rw, 0, sizeof(*rw));
dodebug = LOCKDEBUG_ALLOC(rw, &rwlock_lockops,
(uintptr_t)__builtin_return_address(0));
RW_SETDEBUG(rw, dodebug);
}
