3e898476c7
This reverts commit 6f94de3ca4
(Doesn't try to increase the number of TLS slots; that leads to
an inability to boot. Adds more tests.)
Change-Id: Ia7d25ba3995219ed6e686463dbba80c95cc831ca
62 lines
2.8 KiB
C
62 lines
2.8 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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#ifndef _BIONIC_THREAD_LOCAL_BUFFER_H_included
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#define _BIONIC_THREAD_LOCAL_BUFFER_H_included
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#include <malloc.h>
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#include <pthread.h>
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// libstdc++ currently contains __cxa_guard_acquire and __cxa_guard_release,
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// so we make do with macros instead of a C++ class.
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// TODO: move __cxa_guard_acquire and __cxa_guard_release into libc.
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// We used to use pthread_once to initialize the keys, but life is more predictable
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// if we allocate them all up front when the C library starts up, via __constructor__.
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#define GLOBAL_INIT_THREAD_LOCAL_BUFFER(name) \
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static pthread_key_t __bionic_tls_ ## name ## _key; \
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static void __bionic_tls_ ## name ## _key_destroy(void* buffer) { \
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free(buffer); \
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} \
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__attribute__((constructor)) static void __bionic_tls_ ## name ## _key_init() { \
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pthread_key_create(&__bionic_tls_ ## name ## _key, __bionic_tls_ ## name ## _key_destroy); \
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}
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// Leaves "name_tls_buffer" and "name_tls_buffer_size" defined and initialized.
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#define LOCAL_INIT_THREAD_LOCAL_BUFFER(type, name, byte_count) \
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type name ## _tls_buffer = \
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reinterpret_cast<type>(pthread_getspecific(__bionic_tls_ ## name ## _key)); \
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if (name ## _tls_buffer == NULL) { \
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name ## _tls_buffer = reinterpret_cast<type>(calloc(1, byte_count)); \
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pthread_setspecific(__bionic_tls_ ## name ## _key, name ## _tls_buffer); \
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} \
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const size_t name ## _tls_buffer_size __attribute__((unused)) = byte_count
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#endif // _BIONIC_THREAD_LOCAL_BUFFER_H_included
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