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LibC+LibPthread: Implement function forwarding for libpthread
GCC will insert various calls to pthread functions when compiling C++ code with static initializers, even when the user doesn't link their program against libpthread explicitly. This is used to make static initializers thread-safe, e.g. when building a library that does not itself use thread functionality and thus does not link against libpthread - but is intended to be used with other code that does use libpthread explicitly. This makes these symbols available in libc.
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14 changed files with 381 additions and 100 deletions
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Userland/Libraries/LibPthread/forward.cpp
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Userland/Libraries/LibPthread/forward.cpp
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/*
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* Copyright (c) 2021, Gunnar Beutner <gunnar@beutner.name>
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibC/bits/pthread_forward.h>
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static const PthreadFunctions s_functions = {
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.pthread_mutex_trylock = pthread_mutex_trylock,
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.pthread_mutex_destroy = pthread_mutex_destroy,
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.pthread_mutexattr_init = pthread_mutexattr_init,
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.pthread_mutexattr_settype = pthread_mutexattr_settype,
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.pthread_mutexattr_destroy = pthread_mutexattr_destroy,
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.pthread_once = pthread_once,
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.pthread_cond_broadcast = pthread_cond_broadcast,
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.pthread_cond_init = pthread_cond_init,
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.pthread_cond_signal = pthread_cond_signal,
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.pthread_cond_wait = pthread_cond_wait,
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.pthread_cond_destroy = pthread_cond_destroy,
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.pthread_cond_timedwait = pthread_cond_timedwait,
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};
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[[gnu::constructor]] static void forward_pthread_functions()
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{
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__init_pthread_forward(s_functions);
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}
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