| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | #ifndef _SYS_TLS_H |
| 29 | #define _SYS_TLS_H |
| 30 | |
| 31 | #include <sys/cdefs.h> |
| 32 | |
| 33 | __BEGIN_DECLS |
| 34 | |
| 35 | /* maximum number of elements in the TLS array */ |
| 36 | #define BIONIC_TLS_SLOTS 64 |
| 37 | |
| 38 | /* note that slot 0, called TLS_SLOT_SELF must point to itself. |
| 39 | * this is required to implement thread-local storage with the x86 |
| 40 | * Linux kernel, that reads the TLS from fs:[0], where 'fs' is a |
| 41 | * thread-specific segment descriptor... |
| 42 | */ |
| 43 | |
| 44 | /* Well known TLS slots */ |
| 45 | #define TLS_SLOT_SELF 0 |
| 46 | #define TLS_SLOT_THREAD_ID 1 |
| 47 | #define TLS_SLOT_ERRNO 2 |
| 48 | |
| 49 | #define TLS_SLOT_OPENGL_API 3 |
| 50 | #define TLS_SLOT_OPENGL 4 |
| 51 | |
| 52 | /* small technical note: it is not possible to call pthread_setspecific |
| 53 | * on keys that are <= TLS_SLOT_MAX_WELL_KNOWN, which is why it is set to |
| 54 | * TLS_SLOT_ERRNO. |
| 55 | * |
| 56 | * later slots like TLS_SLOT_OPENGL are pre-allocated through the use of |
| 57 | * TLS_DEFAULT_ALLOC_MAP. this means that there is no need to use |
| 58 | * pthread_key_create() to initialize them. on the other hand, there is |
| 59 | * no destructor associated to them (we might need to implement this later) |
| 60 | */ |
| 61 | #define TLS_SLOT_MAX_WELL_KNOWN TLS_SLOT_ERRNO |
| 62 | |
| 63 | #define TLS_DEFAULT_ALLOC_MAP 0x0000001F |
| 64 | |
| 65 | /* set the Thread Local Storage, must contain at least BIONIC_TLS_SLOTS pointers */ |
| 66 | extern void __init_tls(void** tls, void* thread_info); |
| 67 | |
| 68 | /* syscall only, do not call directly */ |
| 69 | extern int __set_tls(void *ptr); |
| 70 | |
| 71 | /* get the TLS */ |
| 72 | #ifdef __arm__ |
| 73 | # define __get_tls() ( *((volatile void **) 0xffff0ff0) ) |
| 74 | #else |
| 75 | extern void* __get_tls( void ); |
| 76 | #endif |
| 77 | |
| 78 | /* return the stack base and size, used by our malloc debugger */ |
| 79 | extern void* __get_stack_base(int *p_stack_size); |
| 80 | |
| 81 | __END_DECLS |
| 82 | |
| 83 | #endif /* _SYS_TLS_H */ |