93 lines
2.8 KiB
C
93 lines
2.8 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/proc.h>
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#endif
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struct thread;
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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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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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epoch_t epoch_alloc(int flags);
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void epoch_free(epoch_t epoch);
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void epoch_enter(epoch_t epoch);
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void epoch_enter_preempt_internal(epoch_t epoch, struct thread *td);
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void epoch_exit(epoch_t epoch);
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void epoch_exit_preempt_internal(epoch_t epoch, struct thread *td);
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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(void);
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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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static __inline void
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epoch_enter_preempt(epoch_t epoch)
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{
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struct thread *td;
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int nesting __unused;
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td = curthread;
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nesting = td->td_epochnest++;
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#ifndef INVARIANTS
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if (nesting == 0)
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#endif
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epoch_enter_preempt_internal(epoch, td);
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}
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static __inline void
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epoch_exit_preempt(epoch_t epoch)
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{
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struct thread *td;
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td = curthread;
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MPASS(td->td_epochnest);
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if (td->td_epochnest-- == 1)
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epoch_exit_preempt_internal(epoch, td);
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}
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#endif /* _KERNEL */
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#endif
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