94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_EPOCH_H_
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#define _SYS_EPOCH_H_
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#ifdef _KERNEL
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#include <sys/lock.h>
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#include <sys/pcpu.h>
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#endif
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struct epoch;
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typedef struct epoch *epoch_t;
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#define EPOCH_PREEMPT 0x1
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#define EPOCH_LOCKED 0x2
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extern epoch_t global_epoch;
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extern epoch_t global_epoch_preempt;
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struct epoch_context {
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void *data[2];
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} __aligned(sizeof(void *));
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typedef struct epoch_context *epoch_context_t;
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struct epoch_tracker {
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void *datap[3];
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#ifdef EPOCH_TRACKER_DEBUG
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int datai[5];
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#else
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int datai[1];
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#endif
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} __aligned(sizeof(void *));
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typedef struct epoch_tracker *epoch_tracker_t;
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epoch_t epoch_alloc(int flags);
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void epoch_free(epoch_t epoch);
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void epoch_wait(epoch_t epoch);
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void epoch_wait_preempt(epoch_t epoch);
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void epoch_call(epoch_t epoch, epoch_context_t ctx, void (*callback) (epoch_context_t));
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int in_epoch(epoch_t epoch);
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int in_epoch_verbose(epoch_t epoch, int dump_onfail);
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#ifdef _KERNEL
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DPCPU_DECLARE(int, epoch_cb_count);
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DPCPU_DECLARE(struct grouptask, epoch_cb_task);
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#define EPOCH_MAGIC0 0xFADECAFEF00DD00D
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#define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
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void epoch_enter_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
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void epoch_exit_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
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void epoch_enter_KBI(epoch_t epoch);
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void epoch_exit_KBI(epoch_t epoch);
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#if defined(KLD_MODULE) && !defined(KLD_TIED)
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#define epoch_enter_preempt(e, t) epoch_enter_preempt_KBI((e), (t))
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#define epoch_exit_preempt(e, t) epoch_exit_preempt_KBI((e), (t))
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#define epoch_enter(e) epoch_enter_KBI((e))
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#define epoch_exit(e) epoch_exit_KBI((e))
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#else
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#include <sys/epoch_private.h>
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#endif /* KLD_MODULE */
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#endif /* _KERNEL */
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#endif
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