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| Rev 1702 | Rev 1757 | ||
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| Line 36... | Line 36... | ||
| 36 | * |
36 | * |
| 37 | * A reader/writer lock can be held by multiple readers at a time. |
37 | * A reader/writer lock can be held by multiple readers at a time. |
| 38 | * Or it can be exclusively held by a sole writer at a time. |
38 | * Or it can be exclusively held by a sole writer at a time. |
| 39 | * |
39 | * |
| 40 | * These locks are not recursive. |
40 | * These locks are not recursive. |
| 41 | * Because technique called direct hand-off is used, neither readers |
41 | * Because a technique called direct hand-off is used and because |
| - | 42 | * waiting takes place in a single wait queue, neither readers |
|
| 42 | * nor writers will suffer starvation. |
43 | * nor writers will suffer starvation. |
| 43 | * |
44 | * |
| 44 | * If there is a writer followed by a reader waiting for the rwlock |
45 | * If there is a writer followed by a reader waiting for the rwlock |
| 45 | * and the writer times out, all leading readers are automatically woken up |
46 | * and the writer times out, all leading readers are automatically woken up |
| 46 | * and allowed in. |
47 | * and allowed in. |
| Line 384... | Line 385... | ||
| 384 | spinlock_unlock((spinlock_t *) arg); |
385 | spinlock_unlock((spinlock_t *) arg); |
| 385 | } |
386 | } |
| 386 | 387 | ||
| 387 | /** @} |
388 | /** @} |
| 388 | */ |
389 | */ |
| 389 | - | ||