The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/epoch.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
    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  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/12.0/sys/sys/epoch.h 338127 2018-08-21 03:33:54Z mmacy $
   28  */
   29 
   30 #ifndef _SYS_EPOCH_H_
   31 #define _SYS_EPOCH_H_
   32 #ifdef _KERNEL
   33 #include <sys/lock.h>
   34 #include <sys/pcpu.h>
   35 #endif
   36 
   37 struct epoch;
   38 typedef struct epoch *epoch_t;
   39 
   40 #define EPOCH_PREEMPT 0x1
   41 #define EPOCH_LOCKED 0x2
   42 
   43 extern epoch_t global_epoch;
   44 extern epoch_t global_epoch_preempt;
   45 
   46 struct epoch_context {
   47         void   *data[2];
   48 } __aligned(sizeof(void *));
   49 
   50 typedef struct epoch_context *epoch_context_t;
   51 
   52 
   53 struct epoch_tracker {
   54         void *datap[3];
   55 #ifdef EPOCH_TRACKER_DEBUG
   56         int datai[5];
   57 #else
   58         int datai[1];
   59 #endif
   60 }  __aligned(sizeof(void *));
   61 
   62 typedef struct epoch_tracker *epoch_tracker_t;
   63 
   64 epoch_t epoch_alloc(int flags);
   65 void    epoch_free(epoch_t epoch);
   66 void    epoch_wait(epoch_t epoch);
   67 void    epoch_wait_preempt(epoch_t epoch);
   68 void    epoch_call(epoch_t epoch, epoch_context_t ctx, void (*callback) (epoch_context_t));
   69 int     in_epoch(epoch_t epoch);
   70 int in_epoch_verbose(epoch_t epoch, int dump_onfail);
   71 #ifdef _KERNEL
   72 DPCPU_DECLARE(int, epoch_cb_count);
   73 DPCPU_DECLARE(struct grouptask, epoch_cb_task);
   74 #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
   75 #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
   76 
   77 void epoch_enter_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
   78 void epoch_exit_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
   79 void epoch_enter_KBI(epoch_t epoch);
   80 void epoch_exit_KBI(epoch_t epoch);
   81 
   82 
   83 #if defined(KLD_MODULE) && !defined(KLD_TIED)
   84 #define epoch_enter_preempt(e, t)       epoch_enter_preempt_KBI((e), (t))
   85 #define epoch_exit_preempt(e, t)        epoch_exit_preempt_KBI((e), (t))
   86 #define epoch_enter(e)  epoch_enter_KBI((e))
   87 #define epoch_exit(e)   epoch_exit_KBI((e))
   88 #else
   89 #include <sys/epoch_private.h>
   90 #endif /* KLD_MODULE */
   91 
   92 #endif /* _KERNEL */
   93 #endif

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