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623b6bdf | 1 | /* Multi-thread control defs for remote server for GDB. |
88b9d363 | 2 | Copyright (C) 1993-2022 Free Software Foundation, Inc. |
623b6bdf YQ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
1a5c2598 TT |
19 | #ifndef GDBSERVER_GDBTHREAD_H |
20 | #define GDBSERVER_GDBTHREAD_H | |
623b6bdf | 21 | |
268a13a5 | 22 | #include "gdbsupport/common-gdbthread.h" |
6a6bbd9d | 23 | #include "inferiors.h" |
623b6bdf | 24 | |
9c80ecd6 SM |
25 | #include <list> |
26 | ||
9accd112 | 27 | struct btrace_target_info; |
a44892be | 28 | struct regcache; |
9accd112 | 29 | |
623b6bdf YQ |
30 | struct thread_info |
31 | { | |
c90b0ec1 SM |
32 | thread_info (ptid_t id, void *target_data) |
33 | : id (id), target_data (target_data) | |
34 | { | |
35 | this->last_status.kind = TARGET_WAITKIND_IGNORE; | |
36 | } | |
37 | ||
38 | ~thread_info () | |
39 | { | |
40 | free_register_cache (this->regcache_data); | |
41 | } | |
42 | ||
9c80ecd6 SM |
43 | /* The id of this thread. */ |
44 | ptid_t id; | |
80894984 | 45 | |
623b6bdf | 46 | void *target_data; |
c90b0ec1 | 47 | struct regcache *regcache_data = nullptr; |
623b6bdf YQ |
48 | |
49 | /* The last resume GDB requested on this thread. */ | |
c90b0ec1 | 50 | enum resume_kind last_resume_kind = resume_continue; |
623b6bdf YQ |
51 | |
52 | /* The last wait status reported for this thread. */ | |
53 | struct target_waitstatus last_status; | |
54 | ||
b7ea362b | 55 | /* True if LAST_STATUS hasn't been reported to GDB yet. */ |
c90b0ec1 | 56 | int status_pending_p = 0; |
b7ea362b | 57 | |
623b6bdf YQ |
58 | /* Given `while-stepping', a thread may be collecting data for more |
59 | than one tracepoint simultaneously. E.g.: | |
60 | ||
61 | ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs | |
62 | ff0002 INSN2 | |
63 | ff0003 INSN3 <-- TP2, collect $regs | |
64 | ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs | |
65 | ff0005 INSN5 | |
66 | ||
67 | Notice that when instruction INSN5 is reached, the while-stepping | |
68 | actions of both TP1 and TP3 are still being collected, and that TP2 | |
69 | had been collected meanwhile. The whole range of ff0001-ff0005 | |
70 | should be single-stepped, due to at least TP1's while-stepping | |
71 | action covering the whole range. | |
72 | ||
73 | On the other hand, the same tracepoint with a while-stepping action | |
74 | may be hit by more than one thread simultaneously, hence we can't | |
75 | keep the current step count in the tracepoint itself. | |
76 | ||
77 | This is the head of the list of the states of `while-stepping' | |
78 | tracepoint actions this thread is now collecting; NULL if empty. | |
79 | Each item in the list holds the current step of the while-stepping | |
80 | action. */ | |
c90b0ec1 | 81 | struct wstep_state *while_stepping = nullptr; |
9accd112 MM |
82 | |
83 | /* Branch trace target information for this thread. */ | |
c90b0ec1 | 84 | struct btrace_target_info *btrace = nullptr; |
623b6bdf YQ |
85 | }; |
86 | ||
9c80ecd6 | 87 | extern std::list<thread_info *> all_threads; |
623b6bdf YQ |
88 | |
89 | void remove_thread (struct thread_info *thread); | |
f7667f0d | 90 | struct thread_info *add_thread (ptid_t ptid, void *target_data); |
623b6bdf | 91 | |
9c80ecd6 SM |
92 | /* Return a pointer to the first thread, or NULL if there isn't one. */ |
93 | ||
649ebbca DE |
94 | struct thread_info *get_first_thread (void); |
95 | ||
623b6bdf | 96 | struct thread_info *find_thread_ptid (ptid_t ptid); |
623b6bdf | 97 | |
34c65914 PA |
98 | /* Find any thread of the PID process. Returns NULL if none is |
99 | found. */ | |
100 | struct thread_info *find_any_thread_of_pid (int pid); | |
101 | ||
9c80ecd6 SM |
102 | /* Find the first thread for which FUNC returns true. Return NULL if no thread |
103 | satisfying FUNC is found. */ | |
104 | ||
105 | template <typename Func> | |
106 | static thread_info * | |
107 | find_thread (Func func) | |
108 | { | |
109 | std::list<thread_info *>::iterator next, cur = all_threads.begin (); | |
110 | ||
111 | while (cur != all_threads.end ()) | |
112 | { | |
113 | next = cur; | |
114 | next++; | |
115 | ||
116 | if (func (*cur)) | |
117 | return *cur; | |
118 | ||
119 | cur = next; | |
120 | } | |
121 | ||
122 | return NULL; | |
123 | } | |
124 | ||
4d3bb80e SM |
125 | /* Like the above, but only consider threads with pid PID. */ |
126 | ||
127 | template <typename Func> | |
128 | static thread_info * | |
129 | find_thread (int pid, Func func) | |
130 | { | |
131 | return find_thread ([&] (thread_info *thread) | |
132 | { | |
133 | return thread->id.pid () == pid && func (thread); | |
134 | }); | |
135 | } | |
136 | ||
6d1e5673 SM |
137 | /* Find the first thread that matches FILTER for which FUNC returns true. |
138 | Return NULL if no thread satisfying these conditions is found. */ | |
139 | ||
140 | template <typename Func> | |
141 | static thread_info * | |
142 | find_thread (ptid_t filter, Func func) | |
143 | { | |
144 | return find_thread ([&] (thread_info *thread) { | |
145 | return thread->id.matches (filter) && func (thread); | |
146 | }); | |
147 | } | |
148 | ||
9c80ecd6 SM |
149 | /* Invoke FUNC for each thread. */ |
150 | ||
151 | template <typename Func> | |
152 | static void | |
153 | for_each_thread (Func func) | |
154 | { | |
155 | std::list<thread_info *>::iterator next, cur = all_threads.begin (); | |
156 | ||
157 | while (cur != all_threads.end ()) | |
158 | { | |
159 | next = cur; | |
160 | next++; | |
161 | func (*cur); | |
162 | cur = next; | |
163 | } | |
164 | } | |
165 | ||
4d3bb80e SM |
166 | /* Like the above, but only consider threads with pid PID. */ |
167 | ||
168 | template <typename Func> | |
169 | static void | |
170 | for_each_thread (int pid, Func func) | |
171 | { | |
172 | for_each_thread ([&] (thread_info *thread) | |
173 | { | |
174 | if (pid == thread->id.pid ()) | |
175 | func (thread); | |
176 | }); | |
177 | } | |
178 | ||
9c80ecd6 SM |
179 | /* Find the a random thread for which FUNC (THREAD) returns true. If |
180 | no entry is found then return NULL. */ | |
181 | ||
182 | template <typename Func> | |
183 | static thread_info * | |
184 | find_thread_in_random (Func func) | |
185 | { | |
186 | int count = 0; | |
187 | int random_selector; | |
188 | ||
189 | /* First count how many interesting entries we have. */ | |
190 | for_each_thread ([&] (thread_info *thread) { | |
191 | if (func (thread)) | |
192 | count++; | |
193 | }); | |
194 | ||
195 | if (count == 0) | |
196 | return NULL; | |
197 | ||
198 | /* Now randomly pick an entry out of those. */ | |
199 | random_selector = (int) | |
200 | ((count * (double) rand ()) / (RAND_MAX + 1.0)); | |
201 | ||
da4ae14a TT |
202 | thread_info *thread = find_thread ([&] (thread_info *thr_arg) { |
203 | return func (thr_arg) && (random_selector-- == 0); | |
9c80ecd6 SM |
204 | }); |
205 | ||
206 | gdb_assert (thread != NULL); | |
207 | ||
208 | return thread; | |
209 | } | |
210 | ||
fbd5db48 | 211 | /* Get current thread ID (Linux task ID). */ |
9c80ecd6 | 212 | #define current_ptid (current_thread->id) |
f5a02773 | 213 | |
9179355e SM |
214 | /* Get the ptid of THREAD. */ |
215 | ||
216 | static inline ptid_t | |
217 | ptid_of (const thread_info *thread) | |
218 | { | |
9c80ecd6 | 219 | return thread->id; |
9179355e SM |
220 | } |
221 | ||
222 | /* Get the pid of THREAD. */ | |
223 | ||
224 | static inline int | |
225 | pid_of (const thread_info *thread) | |
226 | { | |
9c80ecd6 | 227 | return thread->id.pid (); |
9179355e SM |
228 | } |
229 | ||
230 | /* Get the lwp of THREAD. */ | |
231 | ||
232 | static inline long | |
233 | lwpid_of (const thread_info *thread) | |
234 | { | |
9c80ecd6 | 235 | return thread->id.lwp (); |
9179355e SM |
236 | } |
237 | ||
1a5c2598 | 238 | #endif /* GDBSERVER_GDBTHREAD_H */ |