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| 1 | /* Definition for thread-local data handling. NPTL/Alpha version. |
|---|---|
| 2 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _TLS_H |
| 20 | #define _TLS_H 1 |
| 21 | |
| 22 | # include <dl-sysdep.h> |
| 23 | |
| 24 | #ifndef __ASSEMBLER__ |
| 25 | # include <stdbool.h> |
| 26 | # include <stddef.h> |
| 27 | # include <stdint.h> |
| 28 | # include <dl-dtv.h> |
| 29 | |
| 30 | /* Get system call information. */ |
| 31 | # include <sysdep.h> |
| 32 | |
| 33 | /* The TP points to the start of the thread blocks. */ |
| 34 | # define TLS_DTV_AT_TP 1 |
| 35 | # define TLS_TCB_AT_TP 0 |
| 36 | |
| 37 | /* Get the thread descriptor definition. */ |
| 38 | # include <nptl/descr.h> |
| 39 | |
| 40 | typedef struct |
| 41 | { |
| 42 | dtv_t *dtv; |
| 43 | void *__private; |
| 44 | } tcbhead_t; |
| 45 | |
| 46 | /* This is the size of the initial TCB. */ |
| 47 | # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) |
| 48 | |
| 49 | /* This is the size of the TCB. */ |
| 50 | # define TLS_TCB_SIZE sizeof (tcbhead_t) |
| 51 | |
| 52 | /* This is the size we need before TCB. */ |
| 53 | # define TLS_PRE_TCB_SIZE sizeof (struct pthread) |
| 54 | |
| 55 | /* Install the dtv pointer. The pointer passed is to the element with |
| 56 | index -1 which contain the length. */ |
| 57 | # define INSTALL_DTV(tcbp, dtvp) \ |
| 58 | (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1) |
| 59 | |
| 60 | /* Install new dtv for current thread. */ |
| 61 | # define INSTALL_NEW_DTV(dtv) \ |
| 62 | (THREAD_DTV() = (dtv)) |
| 63 | |
| 64 | /* Return dtv of given thread descriptor. */ |
| 65 | # define GET_DTV(tcbp) \ |
| 66 | (((tcbhead_t *) (tcbp))->dtv) |
| 67 | |
| 68 | /* Code to initially initialize the thread pointer. This might need |
| 69 | special attention since 'errno' is not yet available and if the |
| 70 | operation can cause a failure 'errno' must not be touched. */ |
| 71 | # define TLS_INIT_TP(tcbp) \ |
| 72 | (__builtin_set_thread_pointer ((void *)(tcbp)), NULL) |
| 73 | |
| 74 | /* Value passed to 'clone' for initialization of the thread register. */ |
| 75 | # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 |
| 76 | |
| 77 | /* Return the address of the dtv for the current thread. */ |
| 78 | # define THREAD_DTV() \ |
| 79 | (((tcbhead_t *) __builtin_thread_pointer ())->dtv) |
| 80 | |
| 81 | /* Return the thread descriptor for the current thread. */ |
| 82 | # define THREAD_SELF \ |
| 83 | ((struct pthread *)__builtin_thread_pointer () - 1) |
| 84 | |
| 85 | /* Magic for libthread_db to know how to do THREAD_SELF. */ |
| 86 | # define DB_THREAD_SELF \ |
| 87 | REGISTER (64, 64, 32 * 8, -sizeof (struct pthread)) |
| 88 | |
| 89 | # include <tcb-access.h> |
| 90 | |
| 91 | /* Get and set the global scope generation counter in struct pthread. */ |
| 92 | #define THREAD_GSCOPE_FLAG_UNUSED 0 |
| 93 | #define THREAD_GSCOPE_FLAG_USED 1 |
| 94 | #define THREAD_GSCOPE_FLAG_WAIT 2 |
| 95 | #define THREAD_GSCOPE_RESET_FLAG() \ |
| 96 | do \ |
| 97 | { int __res \ |
| 98 | = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ |
| 99 | THREAD_GSCOPE_FLAG_UNUSED); \ |
| 100 | if (__res == THREAD_GSCOPE_FLAG_WAIT) \ |
| 101 | lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ |
| 102 | } \ |
| 103 | while (0) |
| 104 | #define THREAD_GSCOPE_SET_FLAG() \ |
| 105 | do \ |
| 106 | { \ |
| 107 | THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ |
| 108 | atomic_write_barrier (); \ |
| 109 | } \ |
| 110 | while (0) |
| 111 | |
| 112 | #endif /* __ASSEMBLER__ */ |
| 113 | |
| 114 | #endif /* tls.h */ |
| 115 |
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