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/* 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 <assert.h>
#include <stddef.h>
#include <string.h>
#include "thread_dbP.h"
td_err_e
td_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg)
{
/* XXX I cannot think of another way but using a static variable. */
/* XXX Use at least __thread once it is possible. */
static td_thrhandle_t th;
LOG ("td_ta_event_getmsg");
/* Test whether the TA parameter is ok. */
if (! ta_ok (ta))
return TD_BADTA;
/* Get the pointer to the thread descriptor with the last event. */
psaddr_t addr;
if (ps_pdread (ta->ph, ta->pthread_last_event,
&addr, sizeof (struct pthread *)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
if (addr == 0)
/* Nothing waiting. */
return TD_NOMSG;
/* Read the event structure from the target. */
td_eventbuf_t event;
if (ps_pdread (ta->ph, (char *) addr + offsetof (struct pthread, eventbuf),
&event, sizeof (td_eventbuf_t)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* If the structure is on the list there better be an event recorded. */
assert (event.eventnum != TD_EVENT_NONE);
/* Generate the thread descriptor. */
th.th_ta_p = (td_thragent_t *) ta;
th.th_unique = addr;
/* Fill the user's data structure. */
msg->event = event.eventnum;
msg->th_p = &th;
msg->msg.data = (uintptr_t) event.eventdata;
/* Get the pointer to the next descriptor with an event. */
psaddr_t next;
if (ps_pdread (ta->ph, (char *) addr + offsetof (struct pthread, nextevent),
&next, sizeof (struct pthread *)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* Store the pointer in the list head variable. */
if (ps_pdwrite (ta->ph, ta->pthread_last_event,
&next, sizeof (struct pthread *)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* Clear the next pointer in the current descriptor. */
next = NULL;
if (ps_pdwrite (ta->ph, (char *) addr + offsetof (struct pthread, nextevent),
&next, sizeof (struct pthread *)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
return TD_OK;
}
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