/*-
 * Copyright 2003 Alexander Kabaev.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 _RTLD_LOCK_H_
#define _RTLD_LOCK_H_

#define RTLI_VERSION            0x02
#define RTLI_VERSION_FORK       0x02

struct RtldLockInfo
{
        unsigned int rtli_version;
        void *(*lock_create)(void);
        void  (*lock_destroy)(void *);
        void  (*rlock_acquire)(void *);
        void  (*wlock_acquire)(void *);
        void  (*lock_release)(void *);
        int   (*thread_set_flag)(int);
        int   (*thread_clr_flag)(int);
        void  (*at_fork)(void *handle);
        void  (*fork_acquire)(void *);
        void  (*fork_release)(void *);
};

extern void _rtld_thread_init(void *);
extern void _rtld_thread_prefork(void);
extern void _rtld_thread_postfork(void);
extern void _rtld_thread_childfork(void);

#ifdef IN_RTLD

struct Struct_Lock;
typedef struct Struct_Lock *rtld_lock_t;

extern rtld_lock_t      rtld_bind_lock;
extern rtld_lock_t      rtld_libc_lock;
extern rtld_lock_t      rtld_phdr_lock;

#define RTLD_LOCK_UNLOCKED      0
#define RTLD_LOCK_RLOCKED       1
#define RTLD_LOCK_WLOCKED       2

struct Struct_RtldLockState;
typedef struct Struct_RtldLockState RtldLockState;

void    rlock_acquire(rtld_lock_t, RtldLockState *);
void    wlock_acquire(rtld_lock_t, RtldLockState *);
void    lock_release(rtld_lock_t, RtldLockState *);
void    lock_upgrade(rtld_lock_t, RtldLockState *);
void    lock_restart_for_upgrade(RtldLockState *);

#endif  /* IN_RTLD */

#endif