1887621de8
I fixed this bug a while back, but didn't remove it from the list, could have added a better test, and could have written clearer code that didn't require a comment. Change-Id: Iebdf0f9a54537a7d5cbca254a5967b1543061f3d
101 lines
4 KiB
C++
101 lines
4 KiB
C++
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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 OWNER 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.
|
|
*/
|
|
|
|
#ifndef __BIONIC_PRIVATE_BIONIC_TLS_H_
|
|
#define __BIONIC_PRIVATE_BIONIC_TLS_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/limits.h>
|
|
#include "__get_tls.h"
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/** WARNING WARNING WARNING
|
|
**
|
|
** This header file is *NOT* part of the public Bionic ABI/API
|
|
** and should not be used/included by user-serviceable parts of
|
|
** the system (e.g. applications).
|
|
**
|
|
** It is only provided here for the benefit of the system dynamic
|
|
** linker and the OpenGL sub-system (which needs to access the
|
|
** pre-allocated slot directly for performance reason).
|
|
**/
|
|
|
|
/* Well-known TLS slots. What data goes in which slot is arbitrary unless otherwise noted. */
|
|
enum {
|
|
TLS_SLOT_SELF = 0, /* The kernel requires this specific slot for x86. */
|
|
TLS_SLOT_THREAD_ID,
|
|
TLS_SLOT_ERRNO,
|
|
|
|
/* This slot in the child's TLS is used to synchronize the parent and child
|
|
* during thread initialization. The child finishes with this mutex before
|
|
* running any code that can set errno, so we can reuse the errno slot. */
|
|
TLS_SLOT_START_MUTEX = TLS_SLOT_ERRNO,
|
|
|
|
/* These two aren't used by bionic itself, but allow the graphics code to
|
|
* access TLS directly rather than using the pthread API. */
|
|
TLS_SLOT_OPENGL_API = 3,
|
|
TLS_SLOT_OPENGL = 4,
|
|
|
|
/* This slot is only used to pass information from the dynamic linker to
|
|
* libc.so when the C library is loaded in to memory. The C runtime init
|
|
* function will then clear it. Since its use is extremely temporary,
|
|
* we reuse an existing location that isn't needed during libc startup. */
|
|
TLS_SLOT_BIONIC_PREINIT = TLS_SLOT_OPENGL_API,
|
|
|
|
TLS_SLOT_STACK_GUARD = 5, /* GCC requires this specific slot for x86. */
|
|
TLS_SLOT_DLERROR,
|
|
|
|
TLS_SLOT_FIRST_USER_SLOT /* Must come last! */
|
|
};
|
|
|
|
/*
|
|
* There are two kinds of slot used internally by bionic --- there are the well-known slots
|
|
* enumerated above, and then there are those that are allocated during startup by calls to
|
|
* pthread_key_create; grep for GLOBAL_INIT_THREAD_LOCAL_BUFFER to find those. We need to manually
|
|
* maintain that second number, but pthread_test will fail if we forget.
|
|
*/
|
|
#define GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT 4
|
|
|
|
#define BIONIC_ALIGN(x, a) (((x) + (a - 1)) & ~(a - 1))
|
|
|
|
/*
|
|
* Maximum number of elements in the TLS array.
|
|
* This includes space for pthread keys and our own internal slots.
|
|
* We need to round up to maintain stack alignment.
|
|
*/
|
|
#define BIONIC_TLS_SLOTS BIONIC_ALIGN(PTHREAD_KEYS_MAX + TLS_SLOT_FIRST_USER_SLOT + GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT, 4)
|
|
|
|
__END_DECLS
|
|
|
|
#if defined(__cplusplus)
|
|
class KernelArgumentBlock;
|
|
extern __LIBC_HIDDEN__ void __libc_init_tls(KernelArgumentBlock& args);
|
|
#endif
|
|
|
|
#endif /* __BIONIC_PRIVATE_BIONIC_TLS_H_ */
|