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author | The Android Open Source Project <initial-contribution@android.com> | 2009-01-15 16:12:07 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-01-15 16:12:07 -0800 |
commit | e5cc1f386b167b9f7bfdebc7219e89aa9b71e4b2 (patch) | |
tree | 2cbd43daa6744ed80e833528f8cbfc0c485e5253 /libc/private | |
parent | 6d6c82c7a0a6b9a89f61b61c66f9b90d9c7177dc (diff) | |
download | bionic-e5cc1f386b167b9f7bfdebc7219e89aa9b71e4b2.zip bionic-e5cc1f386b167b9f7bfdebc7219e89aa9b71e4b2.tar.gz bionic-e5cc1f386b167b9f7bfdebc7219e89aa9b71e4b2.tar.bz2 |
auto import from //branches/cupcake/...@126645
Diffstat (limited to 'libc/private')
-rw-r--r-- | libc/private/bionic_tls.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h new file mode 100644 index 0000000..da34344 --- /dev/null +++ b/libc/private/bionic_tls.h @@ -0,0 +1,94 @@ +/* + * 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 _SYS_TLS_H +#define _SYS_TLS_H + +#include <sys/cdefs.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). + **/ + +/* maximum number of elements in the TLS array */ +#define BIONIC_TLS_SLOTS 64 + +/* note that slot 0, called TLS_SLOT_SELF must point to itself. + * this is required to implement thread-local storage with the x86 + * Linux kernel, that reads the TLS from fs:[0], where 'fs' is a + * thread-specific segment descriptor... + */ + +/* Well known TLS slots */ +#define TLS_SLOT_SELF 0 +#define TLS_SLOT_THREAD_ID 1 +#define TLS_SLOT_ERRNO 2 + +#define TLS_SLOT_OPENGL_API 3 +#define TLS_SLOT_OPENGL 4 + +/* small technical note: it is not possible to call pthread_setspecific + * on keys that are <= TLS_SLOT_MAX_WELL_KNOWN, which is why it is set to + * TLS_SLOT_ERRNO. + * + * later slots like TLS_SLOT_OPENGL are pre-allocated through the use of + * TLS_DEFAULT_ALLOC_MAP. this means that there is no need to use + * pthread_key_create() to initialize them. on the other hand, there is + * no destructor associated to them (we might need to implement this later) + */ +#define TLS_SLOT_MAX_WELL_KNOWN TLS_SLOT_ERRNO + +#define TLS_DEFAULT_ALLOC_MAP 0x0000001F + +/* set the Thread Local Storage, must contain at least BIONIC_TLS_SLOTS pointers */ +extern void __init_tls(void** tls, void* thread_info); + +/* syscall only, do not call directly */ +extern int __set_tls(void *ptr); + +/* get the TLS */ +#ifdef __arm__ +# define __get_tls() ( *((volatile void **) 0xffff0ff0) ) +#else +extern void* __get_tls( void ); +#endif + +/* return the stack base and size, used by our malloc debugger */ +extern void* __get_stack_base(int *p_stack_size); + +__END_DECLS + +#endif /* _SYS_TLS_H */ |