From 187dd78d7bd1c03fcf16e54a30314512d38e1a4a Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Thu, 27 Feb 2003 18:13:05 +0000 Subject: Major update for pthreads, based in large part on improvements from glibc 2.3. This should make threads much more efficient. -Erik --- libpthread/linuxthreads_db/td_thr_tls_get_addr.c | 70 ++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 libpthread/linuxthreads_db/td_thr_tls_get_addr.c (limited to 'libpthread/linuxthreads_db/td_thr_tls_get_addr.c') diff --git a/libpthread/linuxthreads_db/td_thr_tls_get_addr.c b/libpthread/linuxthreads_db/td_thr_tls_get_addr.c new file mode 100644 index 000000000..e140b77dc --- /dev/null +++ b/libpthread/linuxthreads_db/td_thr_tls_get_addr.c @@ -0,0 +1,70 @@ +/* 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 , 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" + +/* 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 __attribute__ ((unused)), + void *map_address __attribute__ ((unused)), + size_t offset __attribute__ ((unused)), + void **address __attribute__ ((unused))) +{ +#if USE_TLS + size_t modid; + union dtv pdtv, *dtvp; + + LOG ("td_thr_tls_get_addr"); + + /* Get the DTV pointer from the thread descriptor. */ + if (ps_pdread (th->th_ta_p->ph, + &((struct _pthread_descr_struct *) th->th_unique)->p_header.data.dtvp, + &dtvp, sizeof dtvp) != PS_OK) + return TD_ERR; /* XXX Other error value? */ + + /* Read the module ID from the link_map. */ + if (ps_pdread (th->th_ta_p->ph, + &((struct link_map *) map_address)->l_tls_modid, + &modid, sizeof modid) != PS_OK) + return TD_ERR; /* XXX Other error value? */ + + /* Get the corresponding entry in the DTV. */ + if (ps_pdread (th->th_ta_p->ph, 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; +#else + return TD_ERR; +#endif +} -- cgit v1.2.3