void objectUnlock(Object *obj) {
Thread *self = threadSelf();
uintptr_t lockword = LOCKWORD_READ(&obj->lock);
uintptr_t thin_locked = self->id<<TID_SHIFT;
TRACE("Thread %p unlock on obj %p...\n", self, obj);
if(lockword == thin_locked) {
/* This barrier is not needed for the thin-locking implementation;
it's a requirement of the Java memory model. */
JMM_UNLOCK_MBARRIER();
LOCKWORD_WRITE(&obj->lock, 0);
/* Required by thin-locking mechanism. */
MBARRIER();
retry:
if(testFlcBit(obj)) {
Monitor *mon = findMonitor(obj);
if(!monitorTryLock(mon, self)) {
threadYield(self);
goto retry;
}
if(testFlcBit(obj) && (mon->obj == obj))
monitorNotify(mon, self);
monitorUnlock(mon, self);
}
} else {
if((lockword & (TID_MASK|SHAPE_BIT)) == thin_locked)
LOCKWORD_WRITE(&obj->lock, lockword - (1<<COUNT_SHIFT));
else
if((lockword & SHAPE_BIT) != 0) {
Monitor *mon = (Monitor*) (lockword & ~SHAPE_BIT);
if((mon->count == 0) && (LOCKWORD_READ(&mon->entering) == 0) &&
(mon->in_wait == 0)) {
TRACE("Thread %p is deflating obj %p...\n", self, obj);
/* This barrier is not needed for the thin-locking
implementation; it's a requirement of the Java
memory model. */
JMM_UNLOCK_MBARRIER();
LOCKWORD_WRITE(&obj->lock, 0);
LOCKWORD_COMPARE_AND_SWAP(&mon->entering, 0, UN_USED);
}
monitorUnlock(mon, self);
}
}
}
void Java_java_lang_Object_notify(void)
{
OBJECT object = popStackAsType(OBJECT);
monitorNotify(object, FALSE);
}