30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/* Retrieve event.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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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