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2003-03-18 Roland McGrath <roland@redhat.com>

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* td_thr_event_getmsg.c (td_thr_event_getmsg): Splice the thread out
	of the ->nextevent linkage.
This commit is contained in:
Roland McGrath 2003-03-18 21:13:42 +00:00
parent 856874c5e9
commit 90758db434
1 changed files with 48 additions and 3 deletions
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49
nptl_db/td_thr_event_getmsg.c
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@ -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? */
/* 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;
}