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authorRoland McGrath <roland@gnu.org>2003-03-18 21:13:42 +0000
committerRoland McGrath <roland@gnu.org>2003-03-18 21:13:42 +0000
commit90758db4341e2f19a1af05a09124ec7a5676304d (patch)
tree8b8e345c90321211533852da9f17d481848bd8c1 /nptl_db/td_thr_event_getmsg.c
parent856874c5e9af5d109236e291384eb678507b75ff (diff)
downloadglibc-90758db4341e2f19a1af05a09124ec7a5676304d.tar.gz
2003-03-18 Roland McGrath <roland@redhat.com>
* td_thr_event_getmsg.c (td_thr_event_getmsg): Splice the thread out of the ->nextevent linkage.
Diffstat (limited to 'nptl_db/td_thr_event_getmsg.c')
-rw-r--r--nptl_db/td_thr_event_getmsg.c51
1 files changed, 48 insertions, 3 deletions
diff --git a/nptl_db/td_thr_event_getmsg.c b/nptl_db/td_thr_event_getmsg.c
index ffd0baadc5..9008633289 100644
--- a/nptl_db/td_thr_event_getmsg.c
+++ b/nptl_db/td_thr_event_getmsg.c
@@ -1,5 +1,5 @@
/* Retrieve event.
- Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -31,7 +31,7 @@ td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg)
LOG ("td_thr_event_getmsg");
- /* Read the even structure from the target. */
+ /* Read the event structure from the target. */
if (ps_pdread (th->th_ta_p->ph,
((char *) th->th_unique
+ offsetof (struct pthread, eventbuf)),
@@ -56,5 +56,50 @@ td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg)
&event, sizeof (td_eventbuf_t)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
- return TD_OK;
+ /* Get the pointer to the thread descriptor with the last event.
+ If it doesn't match TH, then walk down the list until we find it.
+ We must splice it out of the list so that there is no dangling
+ pointer to it later when it dies. */
+ psaddr_t thp, prevp = th->th_ta_p->pthread_last_event;
+ if (ps_pdread (th->th_ta_p->ph,
+ prevp, &thp, sizeof (struct pthread *)) != PS_OK)
+ return TD_ERR; /* XXX Other error value? */
+
+ psaddr_t next;
+ while (thp != 0)
+ {
+ if (ps_pdread (th->th_ta_p->ph,
+ (char *) thp + offsetof (struct pthread, nextevent),
+ &next, sizeof (struct pthread *)) != PS_OK)
+ return TD_ERR; /* XXX Other error value? */
+
+ if (next == thp)
+ return TD_DBERR;
+
+ if (thp == th->th_unique)
+ {
+ /* PREVP points at this thread, splice it out. */
+ if (prevp == (char *) next + offsetof (struct pthread, nextevent))
+ return TD_DBERR;
+
+ if (ps_pdwrite (th->th_ta_p->ph, prevp, &next, sizeof next) != PS_OK)
+ return TD_ERR; /* XXX Other error value? */
+
+ /* Now clear this thread's own next pointer so it's not dangling
+ when the thread resumes and then chains on for its next event. */
+ next = NULL;
+ if (ps_pdwrite (th->th_ta_p->ph,
+ (char *) thp + offsetof (struct pthread, nextevent),
+ &next, sizeof next) != PS_OK)
+ return TD_ERR; /* XXX Other error value? */
+
+ return TD_OK;
+ }
+
+ prevp = (char *) thp + offsetof (struct pthread, nextevent);
+ thp = next;
+ }
+
+ /* Ack! This should not happen. */
+ return TD_DBERR;
}