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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
      *
      * 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.
     * 3. Berkeley Software Design Inc's name may not be used to endorse or
     *    promote products derived from this software without specific prior
     *    written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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__LOCK_H_
    #define _SYS__LOCK_H_
    
    struct lock_object {
            const   char *lo_name;          /* Individual lock name. */
            u_int   lo_flags;
            u_int   lo_data;                /* General class specific data. */
            struct  witness *lo_witness;    /* Data for witness. */
    };
    
    #ifdef _KERNEL
    /*
     * If any of WITNESS, INVARIANTS, or KTR_LOCK KTR tracing has been enabled,
     * then turn on LOCK_DEBUG.  When this option is on, extra debugging
     * facilities such as tracking the file and line number of lock operations
     * are enabled.  Also, mutex locking operations are not inlined to avoid
     * bloat from all the extra debugging code.  We also have to turn on all the
     * calling conventions for this debugging code in modules so that modules can
     * work with both debug and non-debug kernels.
     */
    #if (defined(KLD_MODULE) && !defined(KLD_TIED)) || defined(WITNESS) || defined(INVARIANTS) || \
        defined(LOCK_PROFILING) || defined(KTR)
    #define LOCK_DEBUG      1
    #else
    #define LOCK_DEBUG      0
    #endif
    
    /*
     * In the LOCK_DEBUG case, use the filename and line numbers for debugging
     * operations.  Otherwise, use default values to avoid the unneeded bloat.
     */
    #if LOCK_DEBUG > 0
    #define LOCK_FILE_LINE_ARG_DEF  , const char *file, int line
    #define LOCK_FILE_LINE_ARG      , file, line
    #define LOCK_FILE       __FILE__
    #define LOCK_LINE       __LINE__
    #else
    #define LOCK_FILE_LINE_ARG_DEF
    #define LOCK_FILE_LINE_ARG
    #define LOCK_FILE       NULL
    #define LOCK_LINE       0
    #endif
    #endif /* _KERNEL */
    
    #endif /* !_SYS__LOCK_H_ */

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