()
| 53 | } |
| 54 | |
| 55 | final private Object sval() { |
| 56 | Lock l = lock; |
| 57 | if(l != null) { |
| 58 | l.lock(); |
| 59 | try { |
| 60 | //must re-examine under lock |
| 61 | if(lock != null) { //unrealized |
| 62 | force(); |
| 63 | return sv; |
| 64 | } |
| 65 | } finally { |
| 66 | l.unlock(); |
| 67 | } |
| 68 | } |
| 69 | // realized, read of lock above guarantees visibility of s |
| 70 | return s; |
| 71 | } |
| 72 | |
| 73 | final private Object unwrap(Object ls){ |
| 74 | while(ls instanceof LazySeq) { |