bcea0e2afd
We want to delay the emutls pthread key deletion to keep __thread/thread_local variables working as long as possible. Currently, emutls has its own __attribute__((destructor)) function that deletes its pthread key. That function runs even on process exit, and it can run before other destructor functions and before C++ static object destructors. Move the destructor function to crtbegin_so.c, where an __attribute__((destructor)) function is only called on dlclose. Use a priority 0 destructor, which runs after every destructor with a default or greater priority value. __emutls_unregister_key will still run before destructor functions of DT_NEEDED solibs. It also still leaks memory (both the emutls arrays and each emutls object). Bug: b/80453944 Test: manual Change-Id: I6789bcf168415ab8badf2f64687c6a0136c5c917
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* 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
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* 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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extern void __cxa_finalize(void *);
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extern void *__dso_handle;
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__attribute__((destructor))
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static void __on_dlclose(void) {
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__cxa_finalize(&__dso_handle);
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}
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/* Define a weak stub function here that will be overridden if the solib uses
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* emutls. The function needs to be a definition, not just a declaration,
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* because gold has a bug where it outputs weak+hidden symbols into the .dynsym
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* table. */
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__attribute__((weak,visibility("hidden")))
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void __emutls_unregister_key(void) {
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}
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/* Use a priority of 0 to run after any ordinary destructor function. The
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* priority setting moves the function towards the front of the .fini_array
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* section. */
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__attribute__((destructor(0)))
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static void __on_dlclose_late(void) {
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__emutls_unregister_key();
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}
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/* CRT_LEGACY_WORKAROUND should only be defined when building
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* this file as part of the platform's C library.
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*
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* The C library already defines a function named 'atexit()'
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* for backwards compatibility with older NDK-generated binaries.
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*
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* For newer ones, 'atexit' is actually embedded in the C
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* runtime objects that are linked into the final ELF
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* binary (shared library or executable), and will call
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* __cxa_atexit() in order to un-register any atexit()
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* handler when a library is unloaded.
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*
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* This function must be global *and* hidden. Only the
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* code inside the same ELF binary should be able to access it.
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*/
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#ifdef CRT_LEGACY_WORKAROUND
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# include "__dso_handle.h"
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#else
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# include "__dso_handle_so.h"
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# include "atexit.h"
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#endif
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#include "pthread_atfork.h"
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#ifdef __i386__
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# include "../../arch-x86/bionic/__stack_chk_fail_local.h"
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#endif
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