123 lines
4.6 KiB
C++
123 lines
4.6 KiB
C++
/*
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* Copyright (C) 2008 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_PRIVATE_BIONIC_TLS_H_
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#define __BIONIC_PRIVATE_BIONIC_TLS_H_
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#include <sys/cdefs.h>
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#include "bionic_macros.h"
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#include "__get_tls.h"
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__BEGIN_DECLS
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/** WARNING WARNING WARNING
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**
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** This header file is *NOT* part of the public Bionic ABI/API
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** and should not be used/included by user-serviceable parts of
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** the system (e.g. applications).
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**
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** It is only provided here for the benefit of the system dynamic
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** linker and the OpenGL sub-system (which needs to access the
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** pre-allocated slot directly for performance reason).
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**/
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// Well-known TLS slots. What data goes in which slot is arbitrary unless otherwise noted.
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enum {
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TLS_SLOT_SELF = 0, // The kernel requires this specific slot for x86.
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TLS_SLOT_THREAD_ID,
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TLS_SLOT_ERRNO,
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// These two aren't used by bionic itself, but allow the graphics code to
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// access TLS directly rather than using the pthread API.
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TLS_SLOT_OPENGL_API = 3,
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TLS_SLOT_OPENGL = 4,
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// This slot is only used to pass information from the dynamic linker to
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// libc.so when the C library is loaded in to memory. The C runtime init
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// function will then clear it. Since its use is extremely temporary,
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// we reuse an existing location that isn't needed during libc startup.
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TLS_SLOT_BIONIC_PREINIT = TLS_SLOT_OPENGL_API,
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TLS_SLOT_STACK_GUARD = 5, // GCC requires this specific slot for x86.
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TLS_SLOT_DLERROR,
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// Fast storage for Thread::Current() in ART.
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TLS_SLOT_ART_THREAD_SELF,
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// Lets TSAN avoid using pthread_getspecific for finding the current thread
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// state.
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TLS_SLOT_TSAN,
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BIONIC_TLS_SLOTS // Must come last!
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};
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/*
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* Bionic uses some pthread keys internally. All pthread keys used internally
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* should be created in constructors, except for keys that may be used in or
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* before constructors.
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*
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* We need to manually maintain the count of pthread keys used internally, but
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* pthread_test should fail if we forget.
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*
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* These are the pthread keys currently used internally by libc:
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*
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* basename libc (ThreadLocalBuffer)
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* dirname libc (ThreadLocalBuffer)
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* uselocale libc (can be used in constructors)
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* getmntent_mntent libc (ThreadLocalBuffer)
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* getmntent_strings libc (ThreadLocalBuffer)
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* ptsname libc (ThreadLocalBuffer)
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* ttyname libc (ThreadLocalBuffer)
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* strerror libc (ThreadLocalBuffer)
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* strsignal libc (ThreadLocalBuffer)
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* passwd libc (ThreadLocalBuffer)
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* group libc (ThreadLocalBuffer)
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* _res_key libc (constructor in BSD code)
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*/
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#define LIBC_PTHREAD_KEY_RESERVED_COUNT 12
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/* Internally, jemalloc uses a single key for per thread data. */
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#define JEMALLOC_PTHREAD_KEY_RESERVED_COUNT 1
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#define BIONIC_PTHREAD_KEY_RESERVED_COUNT (LIBC_PTHREAD_KEY_RESERVED_COUNT + JEMALLOC_PTHREAD_KEY_RESERVED_COUNT)
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/*
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* Maximum number of pthread keys allocated.
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* This includes pthread keys used internally and externally.
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*/
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#define BIONIC_PTHREAD_KEY_COUNT (BIONIC_PTHREAD_KEY_RESERVED_COUNT + PTHREAD_KEYS_MAX)
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__END_DECLS
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#if defined(__cplusplus)
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class KernelArgumentBlock;
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extern void __libc_init_main_thread(KernelArgumentBlock&);
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#endif
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#endif /* __BIONIC_PRIVATE_BIONIC_TLS_H_ */
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