/* Definition for thread-local data handling. nptl/IA-64 version. Copyright (C) 2003-2007, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ #ifndef _TLS_H #define _TLS_H 1 #include #ifndef __ASSEMBLER__ # include # include # include # include # include /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; typedef struct { dtv_t *dtv; void *__private; } tcbhead_t; register struct pthread *__thread_self __asm__("r13"); # define TLS_MULTIPLE_THREADS_IN_TCB 1 #else /* __ASSEMBLER__ */ # include #endif /* Alignment requirement for the stack. */ #define STACK_ALIGN 16 #ifndef __ASSEMBLER__ /* Get system call information. */ # include /* This is the size of the initial TCB. */ # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) /* Alignment requirements for the initial TCB. */ # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) /* This is the size of the TCB. */ # define TLS_TCB_SIZE sizeof (tcbhead_t) /* This is the size we need before TCB. If there is not any room for uintptr_t stack_guard and uintptr_t pointer_guard in struct pthread's final padding, we need to put struct pthread 16 byte slower. */ # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \ ? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \ & ~(__alignof__ (struct pthread) - 1)) \ : 0)) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct pthread) /* The DTV is allocated at the TP; the TCB is placed elsewhere. */ # define TLS_DTV_AT_TP 1 /* Get the thread descriptor definition. */ # include /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(descr, dtvp) \ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 /* Install new dtv for current thread. */ # define INSTALL_NEW_DTV(DTV) \ (((tcbhead_t *)__thread_self)->dtv = (DTV)) /* Return dtv of given thread descriptor. */ # define GET_DTV(descr) \ (((tcbhead_t *) (descr))->dtv) #define THREAD_SELF_SYSINFO (((tcbhead_t *) __thread_self)->__private) #define THREAD_SYSINFO(pd) \ (((tcbhead_t *) ((char *) (pd) + TLS_PRE_TCB_SIZE))->__private) #if defined NEED_DL_SYSINFO # define INIT_SYSINFO THREAD_SELF_SYSINFO = (void *) GLRO(dl_sysinfo) #else # define INIT_SYSINFO NULL #endif /* Code to initially initialize the thread pointer. This might need special attention since 'errno' is not yet available and if the operation can cause a failure 'errno' must not be touched. */ # define TLS_INIT_TP(thrdescr, secondcall) \ (__thread_self = (thrdescr), INIT_SYSINFO, NULL) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *)__thread_self)->dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE)) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE) /* Access to data in the thread descriptor is easy. */ #define THREAD_GETMEM(descr, member) \ descr->member #define THREAD_GETMEM_NC(descr, member, idx) \ descr->member[idx] #define THREAD_SETMEM(descr, member, value) \ descr->member = (value) #define THREAD_SETMEM_NC(descr, member, idx, value) \ descr->member[idx] = (value) /* Set the stack guard field in TCB head. */ #define THREAD_SET_STACK_GUARD(value) \ (((uintptr_t *) __thread_self)[-1] = (value)) #define THREAD_COPY_STACK_GUARD(descr) \ (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \ = ((uintptr_t *) __thread_self)[-1]) /* Set the pointer guard field in TCB head. */ #define THREAD_GET_POINTER_GUARD() \ (((uintptr_t *) __thread_self)[-2]) #define THREAD_SET_POINTER_GUARD(value) \ (((uintptr_t *) __thread_self)[-2] = (value)) #define THREAD_COPY_POINTER_GUARD(descr) \ (((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \ = THREAD_GET_POINTER_GUARD ()) /* Get and set the global scope generation counter in struct pthread. */ #define THREAD_GSCOPE_FLAG_UNUSED 0 #define THREAD_GSCOPE_FLAG_USED 1 #define THREAD_GSCOPE_FLAG_WAIT 2 #define THREAD_GSCOPE_RESET_FLAG() \ do \ { int __res \ = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \ THREAD_GSCOPE_FLAG_UNUSED); \ if (__res == THREAD_GSCOPE_FLAG_WAIT) \ lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \ } \ while (0) #define THREAD_GSCOPE_SET_FLAG() \ do \ { \ THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \ atomic_write_barrier (); \ } \ while (0) #define THREAD_GSCOPE_WAIT() \ GL(dl_wait_lookup_done) () #endif /* __ASSEMBLER__ */ #endif /* tls.h */