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| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2007 Jan Hudecek |
2 | * Copyright (c) 2007 Jan Hudecek |
| 3 | * Copyright (c) 2006 Jakub Jermar |
3 | * Copyright (c) 2006 Jakub Jermar |
| 4 | * All rights reserved. |
4 | * All rights reserved. |
| 5 | * |
5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
8 | * are met: |
| 9 | * |
9 | * |
| 10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
| 15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
| 17 | * |
17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
28 | */ |
| 29 | /** @addtogroup sync |
29 | /** @addtogroup sync |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| 35 | #ifndef KERN_RCU_H_ |
35 | #ifndef KERN_RCU_H_ |
| 36 | #define KERN_RCU_H_ |
36 | #define KERN_RCU_H_ |
| 37 | 37 | ||
| 38 | #include <arch/types.h> |
38 | #include <arch/types.h> |
| 39 | #include <ddi/tasklet.h> |
39 | #include <proc/tasklet.h> |
| 40 | #include <arch/barrier.h> |
40 | #include <arch/barrier.h> |
| 41 | #include <preemption.h> |
41 | #include <preemption.h> |
| 42 | 42 | ||
| 43 | 43 | ||
| 44 | /** Read lock for RCU protected pointer */ |
44 | /** Read lock for RCU protected pointer */ |
| 45 | #define rcu_read_lock preemption_disable() |
45 | #define rcu_read_lock preemption_disable() |
| 46 | 46 | ||
| 47 | /** Release of read lock for RCU protected pointer */ |
47 | /** Release of read lock for RCU protected pointer */ |
| 48 | #define rcu_read_unlock preemption_enable() |
48 | #define rcu_read_unlock preemption_enable() |
| 49 | 49 | ||
| 50 | /** Dereferencing of an RCU protected pointer */ |
50 | /** Dereferencing of an RCU protected pointer */ |
| 51 | #define rcu_dereference_pointer(p) (*(p)) |
51 | #define rcu_dereference_pointer(p) (*(p)) |
| 52 | 52 | ||
| 53 | /** Assigning a value to an RCU protected pointer */ |
53 | /** Assigning a value to an RCU protected pointer */ |
| 54 | #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp)} |
54 | #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp)} |
| 55 | 55 | ||
| 56 | void rcu_init(void); |
56 | void rcu_init(void); |
| 57 | void rcu_synchronize(void); |
57 | void rcu_synchronize(void); |
| 58 | void rcu_synchronize_callback_function(void* waitq); |
58 | void rcu_synchronize_callback_function(void* waitq); |
| 59 | void rcu_sync_callback(void (*func)(void* data), void* data); |
59 | void rcu_sync_callback(void (*func)(void* data), void* data); |
| 60 | 60 | ||
| 61 | #endif |
61 | #endif |
| 62 | 62 | ||