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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 rcu.h |
- | 33 | * @brief declarations for RCU |
|
33 | */ |
34 | */ |
34 | 35 | ||
35 | #ifndef KERN_RCU_H_ |
36 | #ifndef KERN_RCU_H_ |
36 | #define KERN_RCU_H_ |
37 | #define KERN_RCU_H_ |
37 | 38 | ||
38 | #include <arch/types.h> |
39 | #include <arch/types.h> |
39 | #include <proc/tasklet.h> |
40 | #include <proc/tasklet.h> |
40 | #include <arch/barrier.h> |
41 | #include <arch/barrier.h> |
41 | #include <arch.h> |
42 | #include <arch.h> |
42 | #include <preemption.h> |
43 | #include <preemption.h> |
43 | 44 | ||
- | 45 | ||
- | 46 | /** Structure for callbacks */ |
|
44 | typedef struct rcu_callback_list { |
47 | typedef struct rcu_callback_list { |
- | 48 | /** next in the list */ |
|
45 | struct rcu_callback_list* next; |
49 | struct rcu_callback_list* next; |
- | 50 | /** pointer to callback function */ |
|
46 | void (*func)(void*); |
51 | void (*func)(void*); |
- | 52 | /** argument to pass to the callback */ |
|
47 | void* data; |
53 | void* data; |
48 | } rcu_callback_list_t; |
54 | } rcu_callback_list_t; |
49 | 55 | ||
50 | 56 | ||
51 | /** Read lock for RCU protected pointer */ |
57 | /** Read lock for RCU protected pointer */ |
52 | #define rcu_read_lock() preemption_disable() |
58 | #define rcu_read_lock() preemption_disable() |
53 | 59 | ||
54 | /** Release of read lock for RCU protected pointer */ |
60 | /** Release of read lock for RCU protected pointer */ |
55 | #define rcu_read_unlock() preemption_enable() |
61 | #define rcu_read_unlock() preemption_enable() |
56 | 62 | ||
57 | /** Dereferencing of an RCU protected pointer */ |
63 | /** Dereferencing of an RCU protected pointer */ |
58 | #define rcu_dereference_pointer(p) (*(p)) |
64 | #define rcu_dereference_pointer(p) (*(p)) |
59 | 65 | ||
60 | /** Assigning a value to an RCU protected pointer */ |
66 | /** Assigning a value to an RCU protected pointer */ |
61 | #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp);} |
67 | #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp);} |
62 | 68 | ||
63 | /** RCU sync callback for those who don't need custom allocation */ |
69 | /** RCU sync callback for those who don't need custom allocation */ |
64 | #define rcu_sync_callback_normal_alloc(func, data) {\ |
70 | #define rcu_sync_callback_normal_alloc(func, data) {\ |
65 | rcu_callback_list_t* rd = malloc(sizeof(rcu_callback_list_t),0);\ |
71 | rcu_callback_list_t* rd = malloc(sizeof(rcu_callback_list_t),0);\ |
66 | rcu_sync_callback(func, data, rd);} |
72 | rcu_sync_callback(func, data, rd);} |
67 | 73 | ||
68 | /** RCU sync callback without custom allocation, default callback (just frees the argument) */ |
74 | /** RCU sync callback without custom allocation, default callback (just frees the argument) */ |
69 | #define rcu_sync_callback_normal_alloc_free(data) rcu_sync_callback_normal_alloc(&rcu_callback_free, data) |
75 | #define rcu_sync_callback_normal_alloc_free(data) rcu_sync_callback_normal_alloc(&rcu_callback_free, data) |
70 | 76 | ||
71 | void rcu_init(void); |
77 | void rcu_init(void); |
72 | void rcu_synchronize(void); |
78 | void rcu_synchronize(void); |
73 | void rcu_synchronize_callback_function(void* waitq); |
79 | void rcu_synchronize_callback_function(void* waitq); |
74 | void rcu_sync_callback(void (*func)(void* data), void* data, rcu_callback_list_t* rcu_struct); |
80 | void rcu_sync_callback(void (*func)(void* data), void* data, rcu_callback_list_t* rcu_struct); |
75 | void rcu_tasklet(void* data); |
81 | void rcu_tasklet(void* data); |
76 | void rcu_passQS(void); |
82 | void rcu_passQS(void); |
77 | void rcu_run_callbacks(void); |
83 | void rcu_run_callbacks(void); |
78 | void rcu_callback_free(void* pointer); |
84 | void rcu_callback_free(void* pointer); |
79 | 85 | ||
80 | 86 | ||
81 | 87 | ||
82 | 88 | ||
83 | #endif |
89 | #endif |
84 | 90 |