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76a50749 | 1 | /* Retrieve event. |
dff8da6b | 2 | Copyright (C) 1999-2024 Free Software Foundation, Inc. |
76a50749 | 3 | This file is part of the GNU C Library. |
76a50749 UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
76a50749 | 18 | |
76a50749 | 19 | #include "thread_dbP.h" |
7f08f55a | 20 | #include <assert.h> |
76a50749 UD |
21 | |
22 | ||
23 | td_err_e | |
24 | td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg) | |
25 | { | |
7f08f55a RM |
26 | td_err_e err; |
27 | psaddr_t eventbuf, eventnum, eventdata; | |
28 | psaddr_t thp, prevp; | |
29 | void *copy; | |
76a50749 UD |
30 | |
31 | LOG ("td_thr_event_getmsg"); | |
32 | ||
7f08f55a RM |
33 | /* Copy the event message buffer in from the inferior. */ |
34 | err = DB_GET_FIELD_ADDRESS (eventbuf, th->th_ta_p, th->th_unique, pthread, | |
35 | eventbuf, 0); | |
36 | if (err == TD_OK) | |
37 | err = DB_GET_STRUCT (copy, th->th_ta_p, eventbuf, td_eventbuf_t); | |
38 | if (err != TD_OK) | |
39 | return err; | |
76a50749 UD |
40 | |
41 | /* Check whether an event occurred. */ | |
7f08f55a RM |
42 | err = DB_GET_FIELD_LOCAL (eventnum, th->th_ta_p, copy, |
43 | td_eventbuf_t, eventnum, 0); | |
44 | if (err != TD_OK) | |
45 | return err; | |
46 | if ((int) (uintptr_t) eventnum == TD_EVENT_NONE) | |
76a50749 UD |
47 | /* Nothing. */ |
48 | return TD_NOMSG; | |
49 | ||
50 | /* Fill the user's data structure. */ | |
7f08f55a RM |
51 | err = DB_GET_FIELD_LOCAL (eventdata, th->th_ta_p, copy, |
52 | td_eventbuf_t, eventdata, 0); | |
53 | if (err != TD_OK) | |
54 | return err; | |
55 | ||
56 | msg->msg.data = (uintptr_t) eventdata; | |
57 | msg->event = (uintptr_t) eventnum; | |
76a50749 | 58 | msg->th_p = th; |
76a50749 UD |
59 | |
60 | /* And clear the event message in the target. */ | |
7f08f55a RM |
61 | memset (copy, 0, th->th_ta_p->ta_sizeof_td_eventbuf_t); |
62 | err = DB_PUT_STRUCT (th->th_ta_p, eventbuf, td_eventbuf_t, copy); | |
63 | if (err != TD_OK) | |
64 | return err; | |
76a50749 | 65 | |
90758db4 RM |
66 | /* Get the pointer to the thread descriptor with the last event. |
67 | If it doesn't match TH, then walk down the list until we find it. | |
68 | We must splice it out of the list so that there is no dangling | |
69 | pointer to it later when it dies. */ | |
7f08f55a RM |
70 | err = DB_GET_SYMBOL (prevp, th->th_ta_p, __nptl_last_event); |
71 | if (err != TD_OK) | |
72 | return err; | |
73 | err = DB_GET_VALUE (thp, th->th_ta_p, __nptl_last_event, 0); | |
74 | if (err != TD_OK) | |
75 | return err; | |
90758db4 | 76 | |
90758db4 RM |
77 | while (thp != 0) |
78 | { | |
7f08f55a RM |
79 | psaddr_t next; |
80 | err = DB_GET_FIELD (next, th->th_ta_p, th->th_unique, pthread, | |
81 | nextevent, 0); | |
82 | if (err != TD_OK) | |
83 | return err; | |
90758db4 RM |
84 | |
85 | if (next == thp) | |
86 | return TD_DBERR; | |
87 | ||
88 | if (thp == th->th_unique) | |
89 | { | |
90 | /* PREVP points at this thread, splice it out. */ | |
7f08f55a RM |
91 | psaddr_t next_nextp; |
92 | err = DB_GET_FIELD_ADDRESS (next_nextp, th->th_ta_p, next, pthread, | |
93 | nextevent, 0); | |
94 | assert (err == TD_OK); /* We used this field before. */ | |
95 | if (prevp == next_nextp) | |
90758db4 RM |
96 | return TD_DBERR; |
97 | ||
7f08f55a RM |
98 | err = _td_store_value (th->th_ta_p, |
99 | th->th_ta_p->ta_var___nptl_last_event, -1, | |
100 | 0, prevp, next); | |
101 | if (err != TD_OK) | |
102 | return err; | |
90758db4 RM |
103 | |
104 | /* Now clear this thread's own next pointer so it's not dangling | |
105 | when the thread resumes and then chains on for its next event. */ | |
7f08f55a | 106 | return DB_PUT_FIELD (th->th_ta_p, thp, pthread, nextevent, 0, 0); |
90758db4 RM |
107 | } |
108 | ||
7f08f55a RM |
109 | err = DB_GET_FIELD_ADDRESS (prevp, th->th_ta_p, thp, pthread, |
110 | nextevent, 0); | |
111 | assert (err == TD_OK); /* We used this field before. */ | |
90758db4 RM |
112 | thp = next; |
113 | } | |
114 | ||
115 | /* Ack! This should not happen. */ | |
116 | return TD_DBERR; | |
76a50749 | 117 | } |