106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* Retrieve event.
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Copyright (C) 1999, 2001, 2002, 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <stddef.h>
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#include <string.h>
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#include "thread_dbP.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_eventbuf_t event;
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LOG ("td_thr_event_getmsg");
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/* Read the event structure from the target. */
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if (ps_pdread (th->th_ta_p->ph,
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((char *) th->th_unique
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+ offsetof (struct pthread, eventbuf)),
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&event, sizeof (td_eventbuf_t)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Check whether an event occurred. */
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if (event.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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msg->event = event.eventnum;
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msg->th_p = th;
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msg->msg.data = (uintptr_t) event.eventdata;
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/* And clear the event message in the target. */
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memset (&event, '\0', sizeof (td_eventbuf_t));
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if (ps_pdwrite (th->th_ta_p->ph,
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((char *) th->th_unique
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+ offsetof (struct pthread, eventbuf)),
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&event, sizeof (td_eventbuf_t)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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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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psaddr_t thp, prevp = th->th_ta_p->pthread_last_event;
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if (ps_pdread (th->th_ta_p->ph,
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prevp, &thp, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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psaddr_t next;
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while (thp != 0)
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{
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if (ps_pdread (th->th_ta_p->ph,
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(char *) thp + offsetof (struct pthread, nextevent),
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&next, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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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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if (prevp == (char *) next + offsetof (struct pthread, nextevent))
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return TD_DBERR;
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if (ps_pdwrite (th->th_ta_p->ph, prevp, &next, sizeof next) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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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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next = NULL;
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if (ps_pdwrite (th->th_ta_p->ph,
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(char *) thp + offsetof (struct pthread, nextevent),
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&next, sizeof next) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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return TD_OK;
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}
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prevp = (char *) thp + offsetof (struct pthread, nextevent);
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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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