FreeBSD/Linux Kernel Cross Reference
sys/sys/kpilite.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: releng/12.0/sys/sys/kpilite.h 335882 2018-07-03 04:02:40Z mmacy $
     */
    
    #ifndef _SYS_KPILITE_H_
    #define _SYS_KPILITE_H_
    #if !defined(GENOFFSET) && (!defined(KLD_MODULE) || defined(KLD_TIED)) && defined(_KERNEL)
    #include "offset.inc"
    
    static __inline void
    sched_pin_lite(struct thread_lite *td)
    {
    
            KASSERT((struct thread *)td == curthread, ("sched_pin called on non curthread"));
            td->td_pinned++;
            __compiler_membar();
    }
    
    static __inline void
    sched_unpin_lite(struct thread_lite *td)
    {
    
            KASSERT((struct thread *)td == curthread, ("sched_unpin called on non curthread"));
            KASSERT(td->td_pinned > 0, ("sched_unpin called on non pinned thread"));
            __compiler_membar();
            td->td_pinned--;
            __compiler_membar();
    }
    #endif
    #endif

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