mirror of
https://github.com/RGBCube/serenity
synced 2025-07-28 10:57:36 +00:00
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.
This commit is contained in:
parent
db3fd11646
commit
88cebb05ad
14 changed files with 381 additions and 100 deletions
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@ -20,7 +20,9 @@ set(LIBC_SOURCES
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mntent.cpp
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netdb.cpp
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poll.cpp
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pthread_forward.cpp
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pthread_integration.cpp
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pthread_tls.cpp
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pwd.cpp
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qsort.cpp
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scanf.cpp
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49
Userland/Libraries/LibC/bits/pthread_forward.h
Normal file
49
Userland/Libraries/LibC/bits/pthread_forward.h
Normal file
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@ -0,0 +1,49 @@
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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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#pragma once
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#include <LibPthread/pthread.h>
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struct PthreadFunctions {
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int (*pthread_mutex_trylock)(pthread_mutex_t* mutex);
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int (*pthread_mutex_destroy)(pthread_mutex_t*);
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int (*pthread_mutexattr_init)(pthread_mutexattr_t*);
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int (*pthread_mutexattr_settype)(pthread_mutexattr_t*, int);
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int (*pthread_mutexattr_destroy)(pthread_mutexattr_t*);
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int (*pthread_once)(pthread_once_t*, void (*)(void));
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int (*pthread_cond_broadcast)(pthread_cond_t*);
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int (*pthread_cond_init)(pthread_cond_t*, const pthread_condattr_t*);
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int (*pthread_cond_signal)(pthread_cond_t*);
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int (*pthread_cond_wait)(pthread_cond_t*, pthread_mutex_t*);
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int (*pthread_cond_destroy)(pthread_cond_t*);
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int (*pthread_cond_timedwait)(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
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};
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void __init_pthread_forward(PthreadFunctions);
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@ -27,6 +27,7 @@
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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@ -37,12 +38,21 @@ void __pthread_fork_atfork_register_prepare(void (*)(void));
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void __pthread_fork_atfork_register_parent(void (*)(void));
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void __pthread_fork_atfork_register_child(void (*)(void));
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int __pthread_mutex_lock(void*);
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int __pthread_mutex_unlock(void*);
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int __pthread_mutex_init(void*, const void*);
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int __pthread_mutex_lock(pthread_mutex_t*);
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int __pthread_mutex_unlock(pthread_mutex_t*);
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int __pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
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typedef void (*KeyDestructor)(void*);
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int __pthread_key_create(pthread_key_t*, KeyDestructor);
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int __pthread_key_delete(pthread_key_t);
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void* __pthread_getspecific(pthread_key_t);
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int __pthread_setspecific(pthread_key_t, const void*);
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int __pthread_self();
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void __pthread_key_destroy_for_current_thread();
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#define __PTHREAD_MUTEX_NORMAL 0
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#define __PTHREAD_MUTEX_RECURSIVE 1
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#define __PTHREAD_MUTEX_INITIALIZER \
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@ -31,6 +31,7 @@
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#include <sys/internals.h>
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#include <unistd.h>
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#ifndef _DYNAMIC_LOADER
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extern "C" {
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extern u32 __stack_chk_guard;
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@ -65,3 +66,4 @@ int _start(int argc, char** argv, char** env)
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return 20150614;
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}
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}
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#endif
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@ -31,4 +31,6 @@
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#include <sys/internals.h>
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#include <unistd.h>
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#ifndef _DYNAMIC_LOADER
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void* __dso_handle __attribute__((__weak__));
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#endif
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107
Userland/Libraries/LibC/pthread_forward.cpp
Normal file
107
Userland/Libraries/LibC/pthread_forward.cpp
Normal file
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@ -0,0 +1,107 @@
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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/assert.h>
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#include <LibC/bits/pthread_forward.h>
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static PthreadFunctions s_pthread_functions;
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void __init_pthread_forward(PthreadFunctions funcs)
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{
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s_pthread_functions = funcs;
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}
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int pthread_mutex_trylock(pthread_mutex_t* mutex)
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{
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VERIFY(s_pthread_functions.pthread_mutex_trylock);
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return s_pthread_functions.pthread_mutex_trylock(mutex);
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}
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int pthread_mutex_destroy(pthread_mutex_t* mutex)
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{
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VERIFY(s_pthread_functions.pthread_mutex_destroy);
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return s_pthread_functions.pthread_mutex_destroy(mutex);
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}
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int pthread_mutexattr_init(pthread_mutexattr_t* attr)
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{
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VERIFY(s_pthread_functions.pthread_mutexattr_init);
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return s_pthread_functions.pthread_mutexattr_init(attr);
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}
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int pthread_mutexattr_settype(pthread_mutexattr_t* attr, int type)
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{
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VERIFY(s_pthread_functions.pthread_mutexattr_settype);
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return s_pthread_functions.pthread_mutexattr_settype(attr, type);
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}
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int pthread_mutexattr_destroy(pthread_mutexattr_t* attr)
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{
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VERIFY(s_pthread_functions.pthread_mutexattr_destroy);
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return s_pthread_functions.pthread_mutexattr_destroy(attr);
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}
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int pthread_once(pthread_once_t* self, void (*callback)(void))
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{
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VERIFY(s_pthread_functions.pthread_once);
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return s_pthread_functions.pthread_once(self, callback);
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}
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int pthread_cond_broadcast(pthread_cond_t* cond)
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{
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VERIFY(s_pthread_functions.pthread_cond_broadcast);
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return s_pthread_functions.pthread_cond_broadcast(cond);
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}
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int pthread_cond_init(pthread_cond_t* cond, const pthread_condattr_t* attr)
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{
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VERIFY(s_pthread_functions.pthread_cond_init);
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return s_pthread_functions.pthread_cond_init(cond, attr);
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}
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int pthread_cond_signal(pthread_cond_t* cond)
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{
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VERIFY(s_pthread_functions.pthread_cond_signal);
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return s_pthread_functions.pthread_cond_signal(cond);
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}
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int pthread_cond_wait(pthread_cond_t* cond, pthread_mutex_t* mutex)
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{
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VERIFY(s_pthread_functions.pthread_cond_wait);
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return s_pthread_functions.pthread_cond_wait(cond, mutex);
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}
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int pthread_cond_destroy(pthread_cond_t* cond)
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{
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VERIFY(s_pthread_functions.pthread_cond_destroy);
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return s_pthread_functions.pthread_cond_destroy(cond);
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}
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int pthread_cond_timedwait(pthread_cond_t* cond, pthread_mutex_t* mutex, const struct timespec* abstime)
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{
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VERIFY(s_pthread_functions.pthread_cond_timedwait);
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return s_pthread_functions.pthread_cond_timedwait(cond, mutex, abstime);
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}
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@ -26,11 +26,9 @@
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#include <AK/Atomic.h>
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#include <AK/NeverDestroyed.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <bits/pthread_integration.h>
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#include <sched.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace {
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@ -110,9 +108,10 @@ int __pthread_self()
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return gettid();
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}
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int __pthread_mutex_lock(void* mutexp)
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int pthread_self() __attribute__((weak, alias("__pthread_self")));
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int __pthread_mutex_lock(pthread_mutex_t* mutex)
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{
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auto* mutex = reinterpret_cast<pthread_mutex_t*>(mutexp);
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auto& atomic = reinterpret_cast<Atomic<u32>&>(mutex->lock);
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pthread_t this_thread = __pthread_self();
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for (;;) {
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}
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}
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int __pthread_mutex_unlock(void* mutexp)
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int pthread_mutex_lock(pthread_mutex_t*) __attribute__((weak, alias("__pthread_mutex_lock")));
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int __pthread_mutex_unlock(pthread_mutex_t* mutex)
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{
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auto* mutex = reinterpret_cast<pthread_mutex_t*>(mutexp);
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if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->level > 0) {
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mutex->level--;
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return 0;
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return 0;
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}
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int __pthread_mutex_init(void* mutexp, const void* attrp)
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int pthread_mutex_unlock(pthread_mutex_t*) __attribute__((weak, alias("__pthread_mutex_unlock")));
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int __pthread_mutex_init(pthread_mutex_t* mutex, const pthread_mutexattr_t* attributes)
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{
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auto* mutex = reinterpret_cast<pthread_mutex_t*>(mutexp);
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auto* attributes = reinterpret_cast<const pthread_mutexattr_t*>(attrp);
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mutex->lock = 0;
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mutex->owner = 0;
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mutex->level = 0;
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mutex->type = attributes ? attributes->type : __PTHREAD_MUTEX_NORMAL;
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return 0;
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}
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int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*) __attribute__((weak, alias("__pthread_mutex_init")));
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}
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130
Userland/Libraries/LibC/pthread_tls.cpp
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130
Userland/Libraries/LibC/pthread_tls.cpp
Normal file
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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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 <AK/Atomic.h>
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#include <LibPthread/pthread.h>
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#include <unistd.h>
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#ifndef _DYNAMIC_LOADER
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extern "C" {
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static constexpr int max_keys = PTHREAD_KEYS_MAX;
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struct KeyTable {
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KeyDestructor destructors[max_keys] { nullptr };
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int next { 0 };
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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};
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struct SpecificTable {
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void* values[max_keys] { nullptr };
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};
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static KeyTable s_keys;
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__thread SpecificTable t_specifics;
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int __pthread_key_create(pthread_key_t* key, KeyDestructor destructor)
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{
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int ret = 0;
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__pthread_mutex_lock(&s_keys.mutex);
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if (s_keys.next >= max_keys) {
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ret = EAGAIN;
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} else {
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*key = s_keys.next++;
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s_keys.destructors[*key] = destructor;
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ret = 0;
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}
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__pthread_mutex_unlock(&s_keys.mutex);
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return ret;
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}
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int pthread_key_create(pthread_key_t*, KeyDestructor) __attribute__((weak, alias("__pthread_key_create")));
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int __pthread_key_delete(pthread_key_t key)
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{
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if (key < 0 || key >= max_keys)
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return EINVAL;
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__pthread_mutex_lock(&s_keys.mutex);
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s_keys.destructors[key] = nullptr;
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__pthread_mutex_unlock(&s_keys.mutex);
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return 0;
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}
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int pthread_key_delete(pthread_key_t) __attribute__((weak, alias("__pthread_key_delete")));
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void* __pthread_getspecific(pthread_key_t key)
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{
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if (key < 0)
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return nullptr;
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if (key >= max_keys)
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return nullptr;
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return t_specifics.values[key];
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}
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void* pthread_getspecific(pthread_key_t) __attribute__((weak, alias("__pthread_getspecific")));
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int __pthread_setspecific(pthread_key_t key, const void* value)
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{
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if (key < 0)
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return EINVAL;
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if (key >= max_keys)
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return EINVAL;
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t_specifics.values[key] = const_cast<void*>(value);
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return 0;
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}
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int pthread_setspecific(pthread_key_t, const void*) __attribute__((weak, alias("__pthread_setspecific")));
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void __pthread_key_destroy_for_current_thread()
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{
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// This function will either be called during exit_thread, for a pthread, or
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// during global program shutdown for the main thread.
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__pthread_mutex_lock(&s_keys.mutex);
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size_t num_used_keys = s_keys.next;
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// Dr. POSIX accounts for weird key destructors setting their own key again.
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// Or even, setting other unrelated keys? Odd, but whatever the Doc says goes.
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for (size_t destruct_iteration = 0; destruct_iteration < PTHREAD_DESTRUCTOR_ITERATIONS; ++destruct_iteration) {
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bool any_nonnull_destructors = false;
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for (size_t key_index = 0; key_index < num_used_keys; ++key_index) {
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void* value = exchange(t_specifics.values[key_index], nullptr);
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if (value && s_keys.destructors[key_index]) {
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any_nonnull_destructors = true;
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(*s_keys.destructors[key_index])(value);
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}
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}
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if (!any_nonnull_destructors)
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break;
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}
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__pthread_mutex_unlock(&s_keys.mutex);
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}
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}
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#endif
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@ -49,8 +49,6 @@
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#include <syscall.h>
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#include <unistd.h>
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void (*__libc_pthread_key_destroy_for_current_thread)() = nullptr;
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static void strtons(const char* str, char** endptr)
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{
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assert(endptr);
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@ -228,8 +226,9 @@ void exit(int status)
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fflush(stdout);
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fflush(stderr);
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if (__libc_pthread_key_destroy_for_current_thread)
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__libc_pthread_key_destroy_for_current_thread();
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||||
#ifndef _DYNAMIC_LOADER
|
||||
__pthread_key_destroy_for_current_thread();
|
||||
#endif
|
||||
|
||||
_exit(status);
|
||||
}
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue