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Diffstat (limited to 'libpthread/nptl_db/td_thr_validate.c')
-rw-r--r--libpthread/nptl_db/td_thr_validate.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/libpthread/nptl_db/td_thr_validate.c b/libpthread/nptl_db/td_thr_validate.c
new file mode 100644
index 000000000..19ee940d6
--- /dev/null
+++ b/libpthread/nptl_db/td_thr_validate.c
@@ -0,0 +1,91 @@
+/* Validate a thread handle.
+ Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
+
+ 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 "thread_dbP.h"
+#include <stdbool.h>
+
+static td_err_e
+check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
+{
+ td_err_e err;
+ psaddr_t next, ofs;
+
+ err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
+ if (err == TD_OK)
+ {
+ if (next == 0)
+ {
+ *uninit = true;
+ return TD_NOTHR;
+ }
+ err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
+ }
+
+ while (err == TD_OK)
+ {
+ if (next == head)
+ return TD_NOTHR;
+
+ if (next - (ofs - (psaddr_t) 0) == th->th_unique)
+ return TD_OK;
+
+ err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
+ }
+
+ return err;
+}
+
+
+td_err_e
+td_thr_validate (const td_thrhandle_t *th)
+{
+ td_err_e err;
+ psaddr_t list = NULL;
+
+ LOG ("td_thr_validate");
+
+ /* First check the list with threads using user allocated stacks. */
+ bool uninit = false;
+ err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
+ if (err == TD_OK)
+ err = check_thread_list (th, list, &uninit);
+
+ /* If our thread is not on this list search the list with stack
+ using implementation allocated stacks. */
+ if (err == TD_NOTHR)
+ {
+ err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
+ if (err == TD_OK)
+ err = check_thread_list (th, list, &uninit);
+
+ if (err == TD_NOTHR && uninit)
+ {
+ /* __pthread_initialize_minimal has not run yet.
+ But the main thread still has a valid ID. */
+ td_thrhandle_t main_th;
+ err = td_ta_map_lwp2thr (th->th_ta_p,
+ ps_getpid (th->th_ta_p->ph), &main_th);
+ if (err == TD_OK && th->th_unique != main_th.th_unique)
+ err = TD_NOTHR;
+ }
+ }
+
+ return err;
+}