126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/* Use the internal lock used by mbrtowc and mbrtoc32.
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Copyright (C) 2019-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2019-2020. */
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/* Use a lock, so that no two threads can invoke mbtowc at the same time. */
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static inline int
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mbtowc_unlocked (wchar_t *pwc, const char *p, size_t m)
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{
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/* Put the hidden internal state of mbtowc into its initial state.
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This is needed at least with glibc, uClibc, and MSVC CRT.
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See <https://sourceware.org/bugzilla/show_bug.cgi?id=9674>. */
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mbtowc (NULL, NULL, 0);
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return mbtowc (pwc, p, m);
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}
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/* Prohibit renaming this symbol. */
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#undef gl_get_mbtowc_lock
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#if GNULIB_MBRTOWC_SINGLE_THREAD
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/* All uses of this function are in a single thread. No locking needed. */
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static int
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mbtowc_with_lock (wchar_t *pwc, const char *p, size_t m)
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{
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return mbtowc_unlocked (pwc, p, m);
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}
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#elif defined _WIN32 && !defined __CYGWIN__
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extern __declspec(dllimport) CRITICAL_SECTION *gl_get_mbtowc_lock (void);
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static int
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mbtowc_with_lock (wchar_t *pwc, const char *p, size_t m)
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{
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CRITICAL_SECTION *lock = gl_get_mbtowc_lock ();
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int ret;
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EnterCriticalSection (lock);
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ret = mbtowc_unlocked (pwc, p, m);
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LeaveCriticalSection (lock);
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return ret;
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}
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#elif HAVE_PTHREAD_API /* AIX, IRIX, Cygwin */
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extern
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# if defined _WIN32 || defined __CYGWIN__
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__declspec(dllimport)
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# endif
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pthread_mutex_t *gl_get_mbtowc_lock (void);
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# if HAVE_WEAK_SYMBOLS /* IRIX */
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/* Avoid the need to link with '-lpthread'. */
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# pragma weak pthread_mutex_lock
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# pragma weak pthread_mutex_unlock
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/* Determine whether libpthread is in use. */
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# pragma weak pthread_mutexattr_gettype
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/* See the comments in lock.h. */
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# define pthread_in_use() \
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(pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
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# else
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# define pthread_in_use() 1
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# endif
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static int
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mbtowc_with_lock (wchar_t *pwc, const char *p, size_t m)
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{
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if (pthread_in_use())
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{
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pthread_mutex_t *lock = gl_get_mbtowc_lock ();
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int ret;
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if (pthread_mutex_lock (lock))
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abort ();
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ret = mbtowc_unlocked (pwc, p, m);
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if (pthread_mutex_unlock (lock))
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abort ();
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return ret;
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}
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else
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return mbtowc_unlocked (pwc, p, m);
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}
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#elif HAVE_THREADS_H
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extern mtx_t *gl_get_mbtowc_lock (void);
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static int
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mbtowc_with_lock (wchar_t *pwc, const char *p, size_t m)
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{
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mtx_t *lock = gl_get_mbtowc_lock ();
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int ret;
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if (mtx_lock (lock) != thrd_success)
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abort ();
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ret = mbtowc_unlocked (pwc, p, m);
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if (mtx_unlock (lock) != thrd_success)
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abort ();
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return ret;
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}
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#endif
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