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119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/* Retrieve event.
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "thread_dbP.h"
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#include <assert.h>
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td_err_e
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td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg)
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{
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td_err_e err;
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psaddr_t eventbuf, eventnum, eventdata;
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psaddr_t thp, prevp;
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void *copy;
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LOG ("td_thr_event_getmsg");
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/* Copy the event message buffer in from the inferior. */
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err = DB_GET_FIELD_ADDRESS (eventbuf, th->th_ta_p, th->th_unique, pthread,
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eventbuf, 0);
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if (err == TD_OK)
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err = DB_GET_STRUCT (copy, th->th_ta_p, eventbuf, td_eventbuf_t);
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if (err != TD_OK)
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return err;
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/* Check whether an event occurred. */
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err = DB_GET_FIELD_LOCAL (eventnum, th->th_ta_p, copy,
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td_eventbuf_t, eventnum, 0);
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if (err != TD_OK)
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return err;
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if ((int) (uintptr_t) eventnum == TD_EVENT_NONE)
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/* Nothing. */
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return TD_NOMSG;
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/* Fill the user's data structure. */
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err = DB_GET_FIELD_LOCAL (eventdata, th->th_ta_p, copy,
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td_eventbuf_t, eventdata, 0);
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if (err != TD_OK)
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return err;
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msg->msg.data = (uintptr_t) eventdata;
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msg->event = (uintptr_t) eventnum;
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msg->th_p = th;
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/* And clear the event message in the target. */
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memset (copy, 0, th->th_ta_p->ta_sizeof_td_eventbuf_t);
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err = DB_PUT_STRUCT (th->th_ta_p, eventbuf, td_eventbuf_t, copy);
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if (err != TD_OK)
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return err;
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/* Get the pointer to the thread descriptor with the last event.
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If it doesn't match TH, then walk down the list until we find it.
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We must splice it out of the list so that there is no dangling
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pointer to it later when it dies. */
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err = DB_GET_SYMBOL (prevp, th->th_ta_p, __nptl_last_event);
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if (err != TD_OK)
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return err;
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err = DB_GET_VALUE (thp, th->th_ta_p, __nptl_last_event, 0);
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if (err != TD_OK)
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return err;
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while (thp != 0)
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{
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psaddr_t next;
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err = DB_GET_FIELD (next, th->th_ta_p, th->th_unique, pthread,
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nextevent, 0);
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if (err != TD_OK)
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return err;
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if (next == thp)
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return TD_DBERR;
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if (thp == th->th_unique)
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{
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/* PREVP points at this thread, splice it out. */
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psaddr_t next_nextp;
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err = DB_GET_FIELD_ADDRESS (next_nextp, th->th_ta_p, next, pthread,
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nextevent, 0);
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assert (err == TD_OK); /* We used this field before. */
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if (prevp == next_nextp)
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return TD_DBERR;
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err = _td_store_value (th->th_ta_p,
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th->th_ta_p->ta_var___nptl_last_event, -1,
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0, prevp, next);
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if (err != TD_OK)
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return err;
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/* Now clear this thread's own next pointer so it's not dangling
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when the thread resumes and then chains on for its next event. */
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return DB_PUT_FIELD (th->th_ta_p, thp, pthread, nextevent, 0, 0);
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}
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err = DB_GET_FIELD_ADDRESS (prevp, th->th_ta_p, thp, pthread,
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nextevent, 0);
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assert (err == TD_OK); /* We used this field before. */
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thp = next;
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}
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/* Ack! This should not happen. */
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return TD_DBERR;
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}
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