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authorUlrich Drepper <drepper@redhat.com>2002-06-12 21:00:23 +0000
committerUlrich Drepper <drepper@redhat.com>2002-06-12 21:00:23 +0000
commit69734e6b922ad63f6fd74b1f894c6e3d64216ba7 (patch)
tree9b99265e39fa89e4f12232c2d58a319601e7d9f3 /linuxthreads_db
parent650f6700d28802c44196299a57c0f958118abeef (diff)
downloadglibc-69734e6b922ad63f6fd74b1f894c6e3d64216ba7.tar.gz
Function to get address of thread local variable.
Diffstat (limited to 'linuxthreads_db')
-rw-r--r--linuxthreads_db/td_thr_tls_get_addr.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/linuxthreads_db/td_thr_tls_get_addr.c b/linuxthreads_db/td_thr_tls_get_addr.c
new file mode 100644
index 0000000000..7e05070a33
--- /dev/null
+++ b/linuxthreads_db/td_thr_tls_get_addr.c
@@ -0,0 +1,62 @@
+/* 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;
+}