libexec/rtld-elf/rtld_lock.h

   1 /*-
   2  * Copyright 2003 Alexander Kabaev.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  26  */
  27
  28 #ifndef _RTLD_LOCK_H_
  29 #define _RTLD_LOCK_H_
  30
  31 #define RTLI_VERSION    0x01
  32 #define MAX_RTLD_LOCKS  8
  33
  34 struct RtldLockInfo
  35 {
  36         unsigned int rtli_version;
  37         void *(*lock_create)(void);
  38         void  (*lock_destroy)(void *);
  39         void  (*rlock_acquire)(void *);
  40         void  (*wlock_acquire)(void *);
  41         void  (*lock_release)(void *);
  42         int   (*thread_set_flag)(int);
  43         int   (*thread_clr_flag)(int);
  44         void  (*at_fork)(void);
  45 };
  46
  47 extern void _rtld_thread_init(struct RtldLockInfo *) __exported;
  48 extern void _rtld_atfork_pre(int *) __exported;
  49 extern void _rtld_atfork_post(int *) __exported;
  50
  51 #ifdef IN_RTLD
  52
  53 struct rtld_lock;
  54 typedef struct rtld_lock *rtld_lock_t;
  55
  56 extern rtld_lock_t      rtld_bind_lock;
  57 extern rtld_lock_t      rtld_libc_lock;
  58 extern rtld_lock_t      rtld_phdr_lock;
  59
  60 #define RTLD_LOCK_UNLOCKED      0
  61 #define RTLD_LOCK_RLOCKED       1
  62 #define RTLD_LOCK_WLOCKED       2
  63
  64 struct Struct_RtldLockState;
  65 typedef struct Struct_RtldLockState RtldLockState;
  66
  67 void    rlock_acquire(rtld_lock_t, RtldLockState *);
  68 void    wlock_acquire(rtld_lock_t, RtldLockState *);
  69 void    lock_release(rtld_lock_t, RtldLockState *);
  70 void    lock_upgrade(rtld_lock_t, RtldLockState *);
  71 void    lock_restart_for_upgrade(RtldLockState *);
  72
  73 #endif  /* IN_RTLD */
  74
  75 #endif