LXR linux/include/linux/rcupreempt

   1/*
   2 * Read-Copy Update mechanism for mutual exclusion (RT implementation)
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 *
  18 * Copyright (C) IBM Corporation, 2006
  19 *
  20 * Author:  Paul McKenney <paulmck@us.ibm.com>
  21 *
  22 * Based on the original work by Paul McKenney <paul.mckenney@us.ibm.com>
  23 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
  24 * Papers:
  25 * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
  26 * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
  27 *
  28 * For detailed explanation of the Preemptible Read-Copy Update mechanism see -
  29 *               http://lwn.net/Articles/253651/
  30 */
  31
  32#ifndef __LINUX_RCUPREEMPT_TRACE_H
  33#define __LINUX_RCUPREEMPT_TRACE_H
  34
  35#include <linux/types.h>
  36#include <linux/kernel.h>
  37
  38#include <asm/atomic.h>
  39
  40/*
  41 * PREEMPT_RCU data structures.
  42 */
  43
  44struct rcupreempt_trace {
  45        long            next_length;
  46        long            next_add;
  47        long            wait_length;
  48        long            wait_add;
  49        long            done_length;
  50        long            done_add;
  51        long            done_remove;
  52        atomic_t        done_invoked;
  53        long            rcu_check_callbacks;
  54        atomic_t        rcu_try_flip_1;
  55        atomic_t        rcu_try_flip_e1;
  56        long            rcu_try_flip_i1;
  57        long            rcu_try_flip_ie1;
  58        long            rcu_try_flip_g1;
  59        long            rcu_try_flip_a1;
  60        long            rcu_try_flip_ae1;
  61        long            rcu_try_flip_a2;
  62        long            rcu_try_flip_z1;
  63        long            rcu_try_flip_ze1;
  64        long            rcu_try_flip_z2;
  65        long            rcu_try_flip_m1;
  66        long            rcu_try_flip_me1;
  67        long            rcu_try_flip_m2;
  68};
  69
  70#ifdef CONFIG_RCU_TRACE
  71#define RCU_TRACE(fn, arg)      fn(arg);
  72#else
  73#define RCU_TRACE(fn, arg)
  74#endif
  75
  76extern void rcupreempt_trace_move2done(struct rcupreempt_trace *trace);
  77extern void rcupreempt_trace_move2wait(struct rcupreempt_trace *trace);
  78extern void rcupreempt_trace_try_flip_1(struct rcupreempt_trace *trace);
  79extern void rcupreempt_trace_try_flip_e1(struct rcupreempt_trace *trace);
  80extern void rcupreempt_trace_try_flip_i1(struct rcupreempt_trace *trace);
  81extern void rcupreempt_trace_try_flip_ie1(struct rcupreempt_trace *trace);
  82extern void rcupreempt_trace_try_flip_g1(struct rcupreempt_trace *trace);
  83extern void rcupreempt_trace_try_flip_a1(struct rcupreempt_trace *trace);
  84extern void rcupreempt_trace_try_flip_ae1(struct rcupreempt_trace *trace);
  85extern void rcupreempt_trace_try_flip_a2(struct rcupreempt_trace *trace);
  86extern void rcupreempt_trace_try_flip_z1(struct rcupreempt_trace *trace);
  87extern void rcupreempt_trace_try_flip_ze1(struct rcupreempt_trace *trace);
  88extern void rcupreempt_trace_try_flip_z2(struct rcupreempt_trace *trace);
  89extern void rcupreempt_trace_try_flip_m1(struct rcupreempt_trace *trace);
  90extern void rcupreempt_trace_try_flip_me1(struct rcupreempt_trace *trace);
  91extern void rcupreempt_trace_try_flip_m2(struct rcupreempt_trace *trace);
  92extern void rcupreempt_trace_check_callbacks(struct rcupreempt_trace *trace);
  93extern void rcupreempt_trace_done_remove(struct rcupreempt_trace *trace);
  94extern void rcupreempt_trace_invoke(struct rcupreempt_trace *trace);
  95extern void rcupreempt_trace_next_add(struct rcupreempt_trace *trace);
  96
  97#endif /* __LINUX_RCUPREEMPT_TRACE_H */
  98