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  1. /*
  2.  * Copyright (c) 2007 Jan Hudecek
  3.  * Copyright (c) 2006 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  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
  16.  *   derived from this software without specific prior written permission.
  17.  *
  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
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  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
  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
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29. /** @addtogroup sync
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_RCU_H_
  36. #define KERN_RCU_H_
  37.  
  38. #include <arch/types.h>
  39. #include <proc/tasklet.h>
  40. #include <arch/barrier.h>
  41. #include <preemption.h>
  42.  
  43.  
  44. /** Read lock for RCU protected pointer */
  45. #define rcu_read_lock preemption_disable()
  46.  
  47. /** Release of read lock for RCU protected pointer */
  48. #define rcu_read_unlock preemption_enable()
  49.  
  50. /** Dereferencing of an RCU protected pointer */
  51. #define rcu_dereference_pointer(p) (*(p))
  52.  
  53. /** Assigning a value to an RCU protected pointer */
  54. #define rcu_assign_pointer(p, newp) {write_barrier(); (p)=(newp)}
  55.  
  56. void rcu_init(void);
  57. void rcu_synchronize(void);
  58. void rcu_synchronize_callback_function(void* waitq);
  59. void rcu_sync_callback(void (*func)(void* data), void* data);
  60.    
  61. #endif
  62.