/* Definitions for thread-local data handling. linuxthreads/IA-64 version. Copyright (C) 2002, 2003, 2004, 2005 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _TLS_H #define _TLS_H #ifndef __ASSEMBLER__ # include <pt-machine.h> # include <stdbool.h> # include <stddef.h> /* Type for the dtv. */ typedef union dtv { size_t counter; struct { void *val; bool is_static; } pointer; } dtv_t; #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif /* __ASSEMBLER__ */ #ifdef HAVE_TLS_SUPPORT /* Signal that TLS support is available. */ # define USE_TLS 1 # ifndef __ASSEMBLER__ typedef struct { dtv_t *dtv; void *private; } tcbhead_t; /* 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. */ # define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) /* The DTV is allocated at the TP; the TCB is placed elsewhere. */ # define TLS_DTV_AT_TP 1 /* Install the dtv pointer. The pointer passed is to the element with index -1 which contain the length. */ # define INSTALL_DTV(tcbp, dtvp) \ ((tcbhead_t *) (tcbp))->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(tcbp) \ (((tcbhead_t *) (tcbp))->dtv) #if defined NEED_DL_SYSINFO # define INIT_SYSINFO \ (((tcbhead_t *) __thread_self)->private = (void *) GLRO(dl_sysinfo)) #else # define INIT_SYSINFO 0 #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(tcbp, secondcall) \ (__thread_self = (__typeof (__thread_self)) (tcbp), 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. */ # undef THREAD_SELF # define THREAD_SELF (__thread_self - 1) # undef INIT_THREAD_SELF # define INIT_THREAD_SELF(descr, nr) \ (__thread_self = (struct _pthread_descr_struct *)(descr) + 1) # define TLS_MULTIPLE_THREADS_IN_TCB 1 /* Get the thread descriptor definition. */ # include <linuxthreads/descr.h> # endif #else # ifndef __ASSEMBLER__ typedef struct { void *tcb; dtv_t *dtv; void *self; int multiple_threads; } tcbhead_t; /* Get the thread descriptor definition. */ # include <linuxthreads/descr.h> # define NONTLS_INIT_TP \ do { \ static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 }; \ __thread_self = (__typeof (__thread_self)) &nontls_init_tp; \ } while (0) #endif #endif /* USE_TLS */ #endif /* tls.h */