116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
/* $NetBSD: pthread_specific.c,v 1.26 2013/03/21 16:49:12 christos Exp $ */
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/*-
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* Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_specific.c,v 1.26 2013/03/21 16:49:12 christos Exp $");
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/* Functions and structures dealing with thread-specific data */
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#include "pthread.h"
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#include "pthread_int.h"
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#include "reentrant.h"
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#include <string.h>
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#include <sys/lwpctl.h>
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#include "../libc/include/extern.h" /* for _sys_setcontext() */
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int pthread_setcontext(const ucontext_t *);
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__strong_alias(__libc_thr_setspecific,pthread_setspecific)
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__strong_alias(__libc_thr_getspecific,pthread_getspecific)
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__strong_alias(__libc_thr_curcpu,pthread_curcpu_np)
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__strong_alias(setcontext,pthread_setcontext)
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int
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pthread_setspecific(pthread_key_t key, const void *value)
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{
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pthread_t self;
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if (__predict_false(__uselibcstub))
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return __libc_thr_setspecific_stub(key, value);
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self = pthread__self();
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/*
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* We can't win here on constness. Having been given a
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* "const void *", we can only assign it to other const void *,
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* and return it from functions that are const void *, without
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* generating a warning.
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*/
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return pthread__add_specific(self, key, value);
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}
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void *
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pthread_getspecific(pthread_key_t key)
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{
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if (__predict_false(__uselibcstub))
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return __libc_thr_getspecific_stub(key);
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return pthread__self()->pt_specific[key].pts_value;
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}
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unsigned int
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pthread_curcpu_np(void)
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{
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if (__predict_false(__uselibcstub))
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return __libc_thr_curcpu_stub();
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{
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const int curcpu = pthread__self()->pt_lwpctl->lc_curcpu;
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pthread__assert(curcpu != LWPCTL_CPU_NONE);
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pthread__assert(curcpu != LWPCTL_CPU_EXITED);
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pthread__assert(curcpu >= 0);
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return curcpu;
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}
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}
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/*
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* Override setcontext so that pthread private pointer is preserved
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*/
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int
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pthread_setcontext(const ucontext_t *ucp)
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{
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#ifdef _UC_TLSBASE
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ucontext_t uc;
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/*
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* Only copy and clear _UC_TLSBASE if it is set.
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*/
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if (ucp->uc_flags & _UC_TLSBASE) {
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uc = *ucp;
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uc.uc_flags &= ~_UC_TLSBASE;
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ucp = &uc;
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}
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#endif /* _UC_TLSBASE */
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return _sys_setcontext(ucp);
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}
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