projects / userspace-rcu.git / blame
| Commit | Line | Data |
|---|---|---|
| c97ae6eb PMF |
1 | Userspace RCU Implementatation |
| 2 | by Mathieu Desnoyers and Paul E. McKenney | |
| 6991f61a | 3 | |
| c97ae6eb PMF |
4 | BUILDING |
| 5 | -------- | |
| 6991f61a | 6 | |
| c97ae6eb PMF |
7 | make |
| 8 | make install | |
| 9 | ||
| aa8c36e0 | 10 | |
| c97ae6eb PMF |
11 | QUICK START GUIDE |
| 12 | ----------------- | |
| aa8c36e0 | 13 | |
| c97ae6eb PMF |
14 | Initialization |
| 15 | ||
| 16 | Each thread that has reader critical sections (that uses | |
| 17 | rcu_read_lock()/rcu_read_unlock() must first register to the URCU | |
| 18 | library. This is done by calling rcu_register_thread(). | |
| 19 | ||
| 20 | Reading | |
| 21 | ||
| 22 | Reader critical sections must be protected by locating them between | |
| 23 | calls to rcu_read_lock() and rcu_read_unlock(). Inside that lock, | |
| 24 | rcu_dereference() may be called to read an RCU protected pointer. | |
| 25 | ||
| 26 | Writing | |
| 27 | ||
| 28 | rcu_assign_pointer() and rcu_xchg_pointer() may be called anywhere. | |
| 29 | After, synchronize_rcu() must be called. When it returns, the old values | |
| 30 | are not in usage anymore. | |
| 31 | ||
| 32 | ||
| 33 | Usage of DEBUG_FULL_MB | |
| 34 | ||
| 35 | DEBUG_FULL_MB uses full SMP barriers for readers. This eliminates the | |
| 36 | need for signals but results in slower reads. | |
| 37 | ||
| 38 | ||
| 39 | Usage of DEBUG_YIELD | |
| 40 | ||
| 41 | DEBUG_YIELD is used to add random delays in the code for testing | |
| 42 | purposes. | |
| 6991f61a | 43 |