7eb138a9e5
Each locale embeds a lazily initialized lconv which is populated by localeconv(3) and localeconv_l(3). When setlocale(3) updates the global locale, the lconv needs to be (lazily) reinitialized. To signal this, we set flag variables in the locale structure. There are two problems: - The flags are set before the locale is fully updated, so a concurrent localeconv() call can observe partially initialized locale data. - No barriers ensure that localeconv() observes a fully initialized locale if a flag is set. So, move the flag update appropriately, and use acq/rel barriers to provide some synchronization. Note that this is inadequate in the face of multiple concurrent calls to setlocale(3), but this is not expected to work regardless. Thanks to Henry Hu <henry.hu.sh@gmail.com> for providing a test case demonstrating the race. PR: 258360 MFC after: 3 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D31899
120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)localeconv.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <locale.h>
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#include "lmonetary.h"
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#include "lnumeric.h"
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/*
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* The localeconv() function constructs a struct lconv from the current
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* monetary and numeric locales.
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*
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* Because localeconv() may be called many times (especially by library
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* routines like printf() & strtod()), the approprate members of the
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* lconv structure are computed only when the monetary or numeric
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* locale has been changed.
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*/
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/*
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* Return the current locale conversion.
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*/
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struct lconv *
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localeconv_l(locale_t loc)
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{
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FIX_LOCALE(loc);
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struct lconv *ret = &loc->lconv;
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if (atomic_load_acq_int(&loc->monetary_locale_changed) != 0) {
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/* LC_MONETARY part */
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struct lc_monetary_T * mptr;
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#define M_ASSIGN_STR(NAME) (ret->NAME = (char*)mptr->NAME)
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#define M_ASSIGN_CHAR(NAME) (ret->NAME = mptr->NAME[0])
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mptr = __get_current_monetary_locale(loc);
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M_ASSIGN_STR(int_curr_symbol);
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M_ASSIGN_STR(currency_symbol);
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M_ASSIGN_STR(mon_decimal_point);
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M_ASSIGN_STR(mon_thousands_sep);
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M_ASSIGN_STR(mon_grouping);
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M_ASSIGN_STR(positive_sign);
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M_ASSIGN_STR(negative_sign);
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M_ASSIGN_CHAR(int_frac_digits);
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M_ASSIGN_CHAR(frac_digits);
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M_ASSIGN_CHAR(p_cs_precedes);
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M_ASSIGN_CHAR(p_sep_by_space);
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M_ASSIGN_CHAR(n_cs_precedes);
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M_ASSIGN_CHAR(n_sep_by_space);
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M_ASSIGN_CHAR(p_sign_posn);
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M_ASSIGN_CHAR(n_sign_posn);
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M_ASSIGN_CHAR(int_p_cs_precedes);
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M_ASSIGN_CHAR(int_n_cs_precedes);
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M_ASSIGN_CHAR(int_p_sep_by_space);
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M_ASSIGN_CHAR(int_n_sep_by_space);
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M_ASSIGN_CHAR(int_p_sign_posn);
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M_ASSIGN_CHAR(int_n_sign_posn);
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atomic_store_int(&loc->monetary_locale_changed, 0);
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}
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if (atomic_load_acq_int(&loc->numeric_locale_changed) != 0) {
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/* LC_NUMERIC part */
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struct lc_numeric_T * nptr;
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#define N_ASSIGN_STR(NAME) (ret->NAME = (char*)nptr->NAME)
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nptr = __get_current_numeric_locale(loc);
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N_ASSIGN_STR(decimal_point);
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N_ASSIGN_STR(thousands_sep);
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N_ASSIGN_STR(grouping);
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atomic_store_int(&loc->numeric_locale_changed, 0);
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}
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return ret;
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}
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struct lconv *
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localeconv(void)
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{
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return localeconv_l(__get_locale());
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}
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