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Function to get address of thread local variable.

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This commit is contained in:
Ulrich Drepper 2002-06-12 21:00:23 +00:00
parent 650f6700d2
commit 69734e6b92
1 changed files with 62 additions and 0 deletions
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linuxthreads_db/td_thr_tls_get_addr.c Normal file
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/* Get address of thread local variable.
Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 2002.
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. */
#include "link.h"
#include "thread_dbP.h"
#include "tls.h"
/* Value used for dtv entries for which the allocation is delayed. */
# define TLS_DTV_UNALLOCATED ((void *) -1l)
td_err_e
td_thr_tls_get_addr (const td_thrhandle_t *th, struct link_map *map,
size_t offset, void **address)
{
struct _pthread_descr_struct pds;
size_t modid;
union dtv pdtv;
LOG ("td_thr_tls_get_addr");
/* Get the thread descriptor. */
if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
th->th_ta_p->sizeof_descr) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* The module ID. */
modid = map->l_tls_modid;
/* Get the corresponding entry in the DTV. */
if (ps_pdread (th->th_ta_p->ph, pds.p_header.data.dtvp + modid, &pdtv,
sizeof (union dtv)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* It could be that the memory for this module is not allocated for
the given thread. */
if (pdtv.pointer == TLS_DTV_UNALLOCATED)
/* There is not much we can do. */
return TD_NOTALLOC;
*address = (char *) pdtv.pointer + offset;
return TD_OK;
}