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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2260 | hudecek | 1 | /* |
| 2 | * Copyright (c) 2007 Jan Hudecek |
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| 3 | * Copyright (c) 2006 Jakub Jermar |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer in the |
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| 14 | * documentation and/or other materials provided with the distribution. |
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| 15 | * - The name of the author may not be used to endorse or promote products |
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| 16 | * derived from this software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | /** @addtogroup sync |
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| 30 | * @{ |
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| 31 | */ |
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| 2430 | hudecek | 32 | /** @file rcu.h |
| 33 | * @brief declarations for RCU |
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| 2260 | hudecek | 34 | */ |
| 35 | |||
| 36 | #ifndef KERN_RCU_H_ |
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| 37 | #define KERN_RCU_H_ |
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| 38 | |||
| 39 | #include <arch/types.h> |
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| 2265 | hudecek | 40 | #include <proc/tasklet.h> |
| 2260 | hudecek | 41 | #include <arch/barrier.h> |
| 2309 | hudecek | 42 | #include <arch.h> |
| 2260 | hudecek | 43 | #include <preemption.h> |
| 44 | |||
| 2430 | hudecek | 45 | |
| 46 | /** Structure for callbacks */ |
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| 2330 | hudecek | 47 | typedef struct rcu_callback_list { |
| 2430 | hudecek | 48 | /** next in the list */ |
| 2330 | hudecek | 49 | struct rcu_callback_list* next; |
| 2430 | hudecek | 50 | /** pointer to callback function */ |
| 2330 | hudecek | 51 | void (*func)(void*); |
| 2430 | hudecek | 52 | /** argument to pass to the callback */ |
| 2330 | hudecek | 53 | void* data; |
| 54 | } rcu_callback_list_t; |
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| 2260 | hudecek | 55 | |
| 2330 | hudecek | 56 | |
| 2260 | hudecek | 57 | /** Read lock for RCU protected pointer */ |
| 2309 | hudecek | 58 | #define rcu_read_lock() preemption_disable() |
| 2260 | hudecek | 59 | |
| 60 | /** Release of read lock for RCU protected pointer */ |
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| 2309 | hudecek | 61 | #define rcu_read_unlock() preemption_enable() |
| 2260 | hudecek | 62 | |
| 63 | /** Dereferencing of an RCU protected pointer */ |
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| 64 | #define rcu_dereference_pointer(p) (*(p)) |
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| 65 | |||
| 66 | /** Assigning a value to an RCU protected pointer */ |
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| 2309 | hudecek | 67 | #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp);} |
| 2260 | hudecek | 68 | |
| 2330 | hudecek | 69 | /** RCU sync callback for those who don't need custom allocation */ |
| 2400 | hudecek | 70 | #define rcu_sync_callback_normal_alloc(func, data) {\ |
| 2330 | hudecek | 71 | rcu_callback_list_t* rd = malloc(sizeof(rcu_callback_list_t),0);\ |
| 2400 | hudecek | 72 | rcu_sync_callback(func, data, rd);} |
| 2330 | hudecek | 73 | |
| 2400 | hudecek | 74 | /** RCU sync callback without custom allocation, default callback (just frees the argument) */ |
| 75 | #define rcu_sync_callback_normal_alloc_free(data) rcu_sync_callback_normal_alloc(&rcu_callback_free, data) |
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| 76 | |||
| 2260 | hudecek | 77 | void rcu_init(void); |
| 78 | void rcu_synchronize(void); |
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| 79 | void rcu_synchronize_callback_function(void* waitq); |
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| 2400 | hudecek | 80 | void rcu_sync_callback(void (*func)(void* data), void* data, rcu_callback_list_t* rcu_struct); |
| 2309 | hudecek | 81 | void rcu_tasklet(void* data); |
| 2330 | hudecek | 82 | void rcu_passQS(void); |
| 2309 | hudecek | 83 | void rcu_run_callbacks(void); |
| 2400 | hudecek | 84 | void rcu_callback_free(void* pointer); |
| 2309 | hudecek | 85 | |
| 2400 | hudecek | 86 | |
| 87 | |||
| 88 | |||
| 2260 | hudecek | 89 | #endif |