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 76