4e1fc19cea
a feature that libstdc++ depends on to simulate the behavior of libc's internal '__isthreaded' variable. One benefit of this is that _libc_once() is now private to _once_stub.c. Requested by: kan
65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/*-
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* Copyright (c) 2009 Advanced Computing Technologies LLC
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* Written by: John H. Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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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 AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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/* This implements pthread_once() for the single-threaded case. */
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static int
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_libc_once(pthread_once_t *once_control, void (*init_routine)(void))
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{
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if (once_control->state == PTHREAD_DONE_INIT)
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return (0);
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init_routine();
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once_control->state = PTHREAD_DONE_INIT;
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return (0);
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}
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/*
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* This is the internal interface provided to libc. It will use
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* pthread_once() from the threading library in a multi-threaded
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* process and _libc_once() for a single-threaded library. Because
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* _libc_once() uses the same ABI for the values in the pthread_once_t
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* structure as the threading library, it is safe for a process to
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* switch from _libc_once() to pthread_once() when threading is
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* enabled.
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*/
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int
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_once(pthread_once_t *once_control, void (*init_routine)(void))
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{
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if (__isthreaded)
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return (_pthread_once(once_control, init_routine));
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return (_libc_once(once_control, init_routine));
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}
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