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jeremybenn |
/* Retrieve event.
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Copyright (C) 1999 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@cygnus.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_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg)
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{
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/* XXX I cannot think of another way but using a static variable. */
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static td_thrhandle_t th;
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td_eventbuf_t event;
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psaddr_t addr;
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LOG ("td_ta_event_getmsg");
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/* Test whether the TA parameter is ok. */
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if (! ta_ok (ta))
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return TD_BADTA;
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/* Get the pointer to the thread descriptor with the last event. */
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if (ps_pdread (ta->ph, ta->pthread_last_event,
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&addr, sizeof (void *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* If the pointer is NULL no event occurred. */
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if (addr == 0)
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return TD_NOMSG;
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/* Read the even structure from the target. */
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if (ps_pdread (ta->ph,
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((char *) addr
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+ offsetof (struct _pthread_descr_struct, p_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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{
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/* Oh well, this means the last event was already read. So
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we have to look for any other event. */
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struct pthread_handle_struct handles[ta->pthread_threads_max];
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int num;
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int i;
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/* Read the number of currently active threads. */
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if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int))
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!= PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Now read the handles. */
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if (ps_pdread (ta->ph, ta->handles, handles,
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ta->pthread_threads_max * sizeof (handles[0])) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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for (i = 0; i < ta->pthread_threads_max && num > 0; ++i)
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{
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if (handles[i].h_descr == NULL)
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/* No entry here. */
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continue;
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/* First count this active thread. */
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--num;
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if (handles[i].h_descr == addr)
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/* We already handled this. */
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continue;
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/* Read the event data for this thread. */
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if (ps_pdread (ta->ph,
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((char *) handles[i].h_descr
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+ offsetof (struct _pthread_descr_struct,
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p_eventbuf)),
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&event, sizeof (td_eventbuf_t)) != PS_OK)
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return TD_ERR;
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if (event.eventnum != TD_EVENT_NONE)
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{
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/* We found a thread with an unreported event. */
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addr = handles[i].h_descr;
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break;
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}
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}
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/* If we haven't found any other event signal this to the user. */
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if (event.eventnum == TD_EVENT_NONE)
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return TD_NOMSG;
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}
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/* Generate the thread descriptor. */
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th.th_ta_p = (td_thragent_t *) ta;
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th.th_unique = addr;
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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 (ta->ph,
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((char *) addr
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+ offsetof (struct _pthread_descr_struct, p_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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return TD_OK;
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}
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