1 /* $NetBSD: pthread_specific.c,v 1.26 2013/03/21 16:49:12 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nathan J. Williams. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: pthread_specific.c,v 1.26 2013/03/21 16:49:12 christos Exp $"); 34 35 /* Functions and structures dealing with thread-specific data */ 36 37 #include "pthread.h" 38 #include "pthread_int.h" 39 #include "reentrant.h" 40 41 #include <string.h> 42 #include <sys/lwpctl.h> 43 44 #include "../libc/include/extern.h" /* for _sys_setcontext() */ 45 46 int pthread_setcontext(const ucontext_t *); 47 48 __strong_alias(__libc_thr_setspecific,pthread_setspecific) 49 __strong_alias(__libc_thr_getspecific,pthread_getspecific) 50 __strong_alias(__libc_thr_curcpu,pthread_curcpu_np) 51 52 __strong_alias(setcontext,pthread_setcontext) 53 54 int 55 pthread_setspecific(pthread_key_t key, const void *value) 56 { 57 pthread_t self; 58 59 if (__predict_false(__uselibcstub)) 60 return __libc_thr_setspecific_stub(key, value); 61 62 self = pthread__self(); 63 /* 64 * We can't win here on constness. Having been given a 65 * "const void *", we can only assign it to other const void *, 66 * and return it from functions that are const void *, without 67 * generating a warning. 68 */ 69 return pthread__add_specific(self, key, value); 70 } 71 72 void * 73 pthread_getspecific(pthread_key_t key) 74 { 75 if (__predict_false(__uselibcstub)) 76 return __libc_thr_getspecific_stub(key); 77 78 return pthread__self()->pt_specific[key].pts_value; 79 } 80 81 unsigned int 82 pthread_curcpu_np(void) 83 { 84 if (__predict_false(__uselibcstub)) 85 return __libc_thr_curcpu_stub(); 86 87 { 88 const int curcpu = pthread__self()->pt_lwpctl->lc_curcpu; 89 90 pthread__assert(curcpu != LWPCTL_CPU_NONE); 91 pthread__assert(curcpu != LWPCTL_CPU_EXITED); 92 pthread__assert(curcpu >= 0); 93 return curcpu; 94 } 95 } 96 97 /* 98 * Override setcontext so that pthread private pointer is preserved 99 */ 100 int 101 pthread_setcontext(const ucontext_t *ucp) 102 { 103 #ifdef _UC_TLSBASE 104 ucontext_t uc; 105 /* 106 * Only copy and clear _UC_TLSBASE if it is set. 107 */ 108 if (ucp->uc_flags & _UC_TLSBASE) { 109 uc = *ucp; 110 uc.uc_flags &= ~_UC_TLSBASE; 111 ucp = &uc; 112 } 113 #endif /* _UC_TLSBASE */ 114 return _sys_setcontext(ucp); 115 } 116