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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_EPOCH_H_
    #define _SYS_EPOCH_H_
    
    struct epoch_context {
            void   *data[2];
    } __aligned(sizeof(void *));
    
    typedef struct epoch_context *epoch_context_t;
    
    #ifdef _KERNEL
    #include <sys/lock.h>
    #include <sys/pcpu.h>
    #include <ck_epoch.h>
    
    struct epoch;
    typedef struct epoch *epoch_t;
    
    #define EPOCH_PREEMPT 0x1
    #define EPOCH_LOCKED 0x2
    
    extern epoch_t global_epoch;
    extern epoch_t global_epoch_preempt;
    
    struct epoch_tracker {
    #ifdef  EPOCH_TRACKER_DEBUG
    #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
    #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
            uint64_t et_magic_pre;
    #endif
            TAILQ_ENTRY(epoch_tracker) et_link;
            struct thread *et_td;
            ck_epoch_section_t et_section;
    #ifdef  EPOCH_TRACKER_DEBUG
            uint64_t et_magic_post;
    #endif
    }  __aligned(sizeof(void *));
    typedef struct epoch_tracker *epoch_tracker_t;
    
    epoch_t epoch_alloc(int flags);
    void    epoch_free(epoch_t epoch);
    void    epoch_wait(epoch_t epoch);
    void    epoch_wait_preempt(epoch_t epoch);
    void    epoch_drain_callbacks(epoch_t epoch);
    void    epoch_call(epoch_t epoch, epoch_context_t ctx, void (*callback) (epoch_context_t));
    int     in_epoch(epoch_t epoch);
    int in_epoch_verbose(epoch_t epoch, int dump_onfail);
    DPCPU_DECLARE(int, epoch_cb_count);
    DPCPU_DECLARE(struct grouptask, epoch_cb_task);
    #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
    #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
    
    void epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et);
    void epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et);
    void epoch_enter(epoch_t epoch);
    void epoch_exit(epoch_t epoch);
    
    /* for binary compatibility - do not use */
    void epoch_enter_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
    void epoch_exit_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
    void epoch_enter_KBI(epoch_t epoch);
    void epoch_exit_KBI(epoch_t epoch);
    
    #endif  /* _KERNEL */
    #endif  /* _SYS_EPOCH_H_ */

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