lib/libthread_xu/thread/thr_rtld.c

   1 /*
   2  * Copyright (c) 2001 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  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/lib/libpthread/thread/thr_rtld.c,v 1.5 2003/11/05 18:19:24 deischen Exp $
  29  * $DragonFly: src/lib/libthread_xu/thread/thr_rtld.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
  30  */
  31 #include <sys/cdefs.h>
  32 #include <stdlib.h>
  33 #include <pthread.h>
  34
  35 #include "rtld_lock.h"
  36 #include "thr_private.h"
  37
  38 static int      _thr_rtld_clr_flag(int);
  39 static void     *_thr_rtld_lock_create(void);
  40 static void     _thr_rtld_lock_destroy(void *);
  41 static void     _thr_rtld_lock_release(void *);
  42 static void     _thr_rtld_rlock_acquire(void *);
  43 static int      _thr_rtld_set_flag(int);
  44 static void     _thr_rtld_wlock_acquire(void *);
  45
  46 static void *
  47 _thr_rtld_lock_create(void)
  48 {
  49         pthread_rwlock_t prwlock;
  50         if (_pthread_rwlock_init(&prwlock, NULL))
  51                 return (NULL);
  52         return (prwlock);
  53 }
  54
  55 static void
  56 _thr_rtld_lock_destroy(void *lock)
  57 {
  58         pthread_rwlock_t prwlock;
  59
  60         prwlock = (pthread_rwlock_t)lock;
  61         if (prwlock != NULL)
  62                 _pthread_rwlock_destroy(&prwlock);
  63 }
  64
  65 static void
  66 _thr_rtld_rlock_acquire(void *lock)
  67 {
  68         pthread_rwlock_t prwlock;
  69
  70         prwlock = (pthread_rwlock_t)lock;
  71         _thr_rwlock_rdlock(&prwlock);
  72 }
  73
  74 static void
  75 _thr_rtld_wlock_acquire(void *lock)
  76 {
  77         pthread_rwlock_t prwlock;
  78
  79         prwlock = (pthread_rwlock_t)lock;
  80         _thr_rwlock_wrlock(&prwlock);
  81 }
  82
  83 static void
  84 _thr_rtld_lock_release(void *lock)
  85 {
  86         pthread_rwlock_t prwlock;
  87
  88         prwlock = (pthread_rwlock_t)lock;
  89         _thr_rwlock_unlock(&prwlock);
  90 }
  91
  92
  93 static int
  94 _thr_rtld_set_flag(int mask)
  95 {
  96         struct pthread *curthread;
  97         int bits;
  98
  99         curthread = _get_curthread();
 100         if (curthread != NULL) {
 101                 bits = curthread->rtld_bits;
 102                 curthread->rtld_bits |= mask;
 103         } else {
 104                 bits = 0;
 105                 PANIC("No current thread in rtld call");
 106         }
 107
 108         return (bits);
 109 }
 110
 111 static int
 112 _thr_rtld_clr_flag(int mask)
 113 {
 114         struct pthread *curthread;
 115         int bits;
 116
 117         curthread = _get_curthread();
 118         if (curthread != NULL) {
 119                 bits = curthread->rtld_bits;
 120                 curthread->rtld_bits &= ~mask;
 121         } else {
 122                 bits = 0;
 123                 PANIC("No current thread in rtld call");
 124         }
 125         return (bits);
 126 }
 127
 128 void
 129 _thr_rtld_init(void)
 130 {
 131         struct RtldLockInfo li;
 132
 133         li.lock_create  = _thr_rtld_lock_create;
 134         li.lock_destroy = _thr_rtld_lock_destroy;
 135         li.rlock_acquire = _thr_rtld_rlock_acquire;
 136         li.wlock_acquire = _thr_rtld_wlock_acquire;
 137         li.lock_release  = _thr_rtld_lock_release;
 138         li.thread_set_flag = _thr_rtld_set_flag;
 139         li.thread_clr_flag = _thr_rtld_clr_flag;
 140         li.at_fork = NULL;
 141         _rtld_thread_init(&li);
 142 }
 143
 144 void
 145 _thr_rtld_fini(void)
 146 {
 147         _rtld_thread_init(NULL);
 148 }