mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
90758db434
* td_thr_event_getmsg.c (td_thr_event_getmsg): Splice the thread out of the ->nextevent linkage.
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* Retrieve event.
|
|
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.
|
|
|
|
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 <stddef.h>
|
|
#include <string.h>
|
|
|
|
#include "thread_dbP.h"
|
|
|
|
|
|
td_err_e
|
|
td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg)
|
|
{
|
|
td_eventbuf_t event;
|
|
|
|
LOG ("td_thr_event_getmsg");
|
|
|
|
/* Read the event structure from the target. */
|
|
if (ps_pdread (th->th_ta_p->ph,
|
|
((char *) th->th_unique
|
|
+ offsetof (struct pthread, eventbuf)),
|
|
&event, sizeof (td_eventbuf_t)) != PS_OK)
|
|
return TD_ERR; /* XXX Other error value? */
|
|
|
|
/* Check whether an event occurred. */
|
|
if (event.eventnum == TD_EVENT_NONE)
|
|
/* Nothing. */
|
|
return TD_NOMSG;
|
|
|
|
/* Fill the user's data structure. */
|
|
msg->event = event.eventnum;
|
|
msg->th_p = th;
|
|
msg->msg.data = (uintptr_t) event.eventdata;
|
|
|
|
/* And clear the event message in the target. */
|
|
memset (&event, '\0', sizeof (td_eventbuf_t));
|
|
if (ps_pdwrite (th->th_ta_p->ph,
|
|
((char *) th->th_unique
|
|
+ offsetof (struct pthread, eventbuf)),
|
|
&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;
|
|
}
|