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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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49
Userland/Libraries/LibC/bits/pthread_forward.h 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.
*/
#pragma once
#include <LibPthread/pthread.h>
struct PthreadFunctions {
int (*pthread_mutex_trylock)(pthread_mutex_t* mutex);
int (*pthread_mutex_destroy)(pthread_mutex_t*);
int (*pthread_mutexattr_init)(pthread_mutexattr_t*);
int (*pthread_mutexattr_settype)(pthread_mutexattr_t*, int);
int (*pthread_mutexattr_destroy)(pthread_mutexattr_t*);
int (*pthread_once)(pthread_once_t*, void (*)(void));
int (*pthread_cond_broadcast)(pthread_cond_t*);
int (*pthread_cond_init)(pthread_cond_t*, const pthread_condattr_t*);
int (*pthread_cond_signal)(pthread_cond_t*);
int (*pthread_cond_wait)(pthread_cond_t*, pthread_mutex_t*);
int (*pthread_cond_destroy)(pthread_cond_t*);
int (*pthread_cond_timedwait)(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
};
void __init_pthread_forward(PthreadFunctions);