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LibC+LibPthread: Implement function forwarding for libpthread

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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.
This commit is contained in:
Gunnar Beutner 2021-04-17 18:38:32 +02:00 • committed by Andreas Kling
parent db3fd11646
commit 88cebb05ad
14 changed files with 381 additions and 100 deletions
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50
Userland/Libraries/LibPthread/forward.cpp Normal file
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/*
* Copyright (c) 2021, Gunnar Beutner <gunnar@beutner.name>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibC/bits/pthread_forward.h>
static const PthreadFunctions s_functions = {
.pthread_mutex_trylock = pthread_mutex_trylock,
.pthread_mutex_destroy = pthread_mutex_destroy,
.pthread_mutexattr_init = pthread_mutexattr_init,
.pthread_mutexattr_settype = pthread_mutexattr_settype,
.pthread_mutexattr_destroy = pthread_mutexattr_destroy,
.pthread_once = pthread_once,
.pthread_cond_broadcast = pthread_cond_broadcast,
.pthread_cond_init = pthread_cond_init,
.pthread_cond_signal = pthread_cond_signal,
.pthread_cond_wait = pthread_cond_wait,
.pthread_cond_destroy = pthread_cond_destroy,
.pthread_cond_timedwait = pthread_cond_timedwait,
};
[[gnu::constructor]] static void forward_pthread_functions()
{
__init_pthread_forward(s_functions);
}