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/*-
* 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_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);
void epoch_thread_init(struct thread *);
void epoch_thread_fini(struct thread *);
#endif /* _KERNEL */
#endif /* _SYS_EPOCH_H_ */
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