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: head/sys/sys/epoch.h 340415 2018-11-13 23:20:55Z glebius $
   28  */
   29 
   30 #ifndef _SYS_EPOCH_H_
   31 #define _SYS_EPOCH_H_
   32 
   33 struct epoch_context {
   34         void   *data[2];
   35 } __aligned(sizeof(void *));
   36 
   37 typedef struct epoch_context *epoch_context_t;
   38 
   39 #ifdef _KERNEL
   40 #include <sys/lock.h>
   41 #include <sys/pcpu.h>
   42 #include <ck_epoch.h>
   43 
   44 struct epoch;
   45 typedef struct epoch *epoch_t;
   46 
   47 #define EPOCH_PREEMPT 0x1
   48 #define EPOCH_LOCKED 0x2
   49 
   50 extern epoch_t global_epoch;
   51 extern epoch_t global_epoch_preempt;
   52 
   53 struct epoch_tracker {
   54 #ifdef  EPOCH_TRACKER_DEBUG
   55 #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
   56 #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
   57         uint64_t et_magic_pre;
   58 #endif
   59         TAILQ_ENTRY(epoch_tracker) et_link;
   60         struct thread *et_td;
   61         ck_epoch_section_t et_section;
   62 #ifdef  EPOCH_TRACKER_DEBUG
   63         uint64_t et_magic_post;
   64 #endif
   65 }  __aligned(sizeof(void *));
   66 typedef struct epoch_tracker *epoch_tracker_t;
   67 
   68 epoch_t epoch_alloc(int flags);
   69 void    epoch_free(epoch_t epoch);
   70 void    epoch_wait(epoch_t epoch);
   71 void    epoch_wait_preempt(epoch_t epoch);
   72 void    epoch_call(epoch_t epoch, epoch_context_t ctx, void (*callback) (epoch_context_t));
   73 int     in_epoch(epoch_t epoch);
   74 int in_epoch_verbose(epoch_t epoch, int dump_onfail);
   75 DPCPU_DECLARE(int, epoch_cb_count);
   76 DPCPU_DECLARE(struct grouptask, epoch_cb_task);
   77 #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
   78 #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
   79 
   80 void epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et);
   81 void epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et);
   82 void epoch_enter(epoch_t epoch);
   83 void epoch_exit(epoch_t epoch);
   84 
   85 void epoch_thread_init(struct thread *);
   86 void epoch_thread_fini(struct thread *);
   87 
   88 #endif  /* _KERNEL */
   89 #endif  /* _SYS_EPOCH_H_ */

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