FreeBSD/Linux Kernel Cross Reference
sys/compat/mach/mach_semaphore.h

     /*      $NetBSD: mach_semaphore.h,v 1.7 2008/04/28 20:23:44 martin Exp $ */
     
     /*-
      * Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Emmanuel Dreyfus
      *
     * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    #ifndef _MACH_SEMAPHORE_H_
    #define _MACH_SEMAPHORE_H_
    
    #include <sys/rwlock.h>
    #include <sys/queue.h>
    
    extern int mach_semaphore_cold;
    
    struct mach_waiting_lwp {
            TAILQ_ENTRY(mach_waiting_lwp) mwl_list;
            struct lwp *mwl_l;
    };
    
    struct mach_semaphore {
            int ms_value;
            int ms_policy;
            LIST_ENTRY(mach_semaphore) ms_list;
            TAILQ_HEAD(ms_waiting, mach_waiting_lwp) ms_waiting;
            krwlock_t ms_lock;
    };
    
    /* semaphore_create */
    
    #define MACH_SYNC_POLICY_FIFO 0
    #define MACH_SYNC_POLICY_FIXED_PRIORITY 1
    
    typedef struct {
            mach_msg_header_t req_msgh;
            mach_ndr_record_t req_ndr;
            int req_policy;
            int req_value;
    } mach_semaphore_create_request_t;
    
    typedef struct {
            mach_msg_header_t rep_msgh;
            mach_msg_body_t rep_body;
            mach_msg_port_descriptor_t rep_sem;
            mach_msg_trailer_t rep_trailer;
    } mach_semaphore_create_reply_t;
    
    /* semaphore_destroy */
    
    typedef struct {
            mach_msg_header_t req_msgh;
            mach_msg_body_t req_body;
            mach_msg_port_descriptor_t req_sem;
    } mach_semaphore_destroy_request_t;
    
    typedef struct {
            mach_msg_header_t rep_msgh;
            mach_ndr_record_t rep_ndr;
            mach_kern_return_t rep_retval;
            mach_msg_trailer_t rep_trailer;
    } mach_semaphore_destroy_reply_t;
    
    void mach_semaphore_init(void);
    void mach_semaphore_cleanup(struct lwp *);
    
    #endif /* _MACH_SEMAPHORE_H_ */
    

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