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1d506c26 | 1 | # Copyright (C) 2014-2024 Free Software Foundation, Inc. |
ede9f622 PA |
2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | # Test that GDB in non-stop mode gives roughly equal priority to | |
17 | # events of all threads. | |
18 | ||
19 | standard_testfile | |
20 | set executable ${testfile} | |
21 | ||
450d26c8 | 22 | require {!target_info exists gdb,nosignals} |
ede9f622 | 23 | |
337532fa YQ |
24 | set options { "additional_flags=-DTIMEOUT=$timeout" debug pthreads } |
25 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile $options] == -1} { | |
ede9f622 PA |
26 | return -1 |
27 | } | |
28 | ||
29 | gdb_test_no_output "set non-stop on" | |
30 | ||
31 | if ![runto_main] { | |
32 | return -1 | |
33 | } | |
34 | ||
35 | # We want "handle print", to make sure the target backend reports the | |
36 | # signal to the run control core. | |
37 | gdb_test "handle SIGUSR1 print nostop pass" "" | |
38 | ||
39 | # Get current value of VAR from the inferior. TEST is used as test | |
40 | # message. | |
41 | ||
42 | proc get_value {var test} { | |
43 | global expect_out | |
44 | global gdb_prompt | |
45 | global decimal | |
46 | ||
47 | set value -1 | |
48 | gdb_test_multiple "print $var" "$test" { | |
49 | -re ".*= ($decimal).*\r\n$gdb_prompt $" { | |
50 | set value $expect_out(1,string) | |
51 | pass "$test" | |
52 | } | |
53 | } | |
54 | return ${value} | |
55 | } | |
56 | ||
57 | set NUM_THREADS [get_value "num_threads" "get num_threads"] | |
58 | ||
59 | # Account for the main thread. | |
60 | incr NUM_THREADS | |
61 | ||
1ed415e2 PA |
62 | # Probe for displaced stepping support. We're stopped at the main |
63 | # breakpoint. If displaced stepping is supported, we should see | |
64 | # related debug output. | |
65 | set displaced_stepping_enabled 0 | |
66 | set msg "check displaced-stepping" | |
67 | gdb_test_no_output "set debug displaced 1" | |
68 | gdb_test_multiple "next" $msg { | |
187b041e | 69 | -re "prepared successfully .*$gdb_prompt $" { |
1ed415e2 PA |
70 | set displaced_stepping_enabled 1 |
71 | } | |
72 | -re ".*$gdb_prompt $" { | |
73 | } | |
74 | } | |
75 | gdb_test_no_output "set debug displaced 0" | |
76 | ||
ede9f622 PA |
77 | # Run threads to their start positions. This prepares for a new test |
78 | # sequence. | |
79 | ||
80 | proc restart {} { | |
81 | global gdb_prompt | |
82 | global NUM_THREADS | |
83 | ||
84 | delete_breakpoints | |
85 | ||
86 | gdb_test "print got_sig = 0" " = 0" | |
87 | ||
88 | gdb_breakpoint [gdb_get_line_number "set thread breakpoint here"] | |
89 | gdb_breakpoint [gdb_get_line_number "set kill breakpoint here"] | |
90 | ||
91 | set test "continue -a&" | |
92 | gdb_test_multiple $test $test { | |
93 | -re "Continuing.\r\n$gdb_prompt " { | |
94 | pass $test | |
95 | } | |
96 | } | |
97 | ||
98 | for {set i 1} { $i <= $NUM_THREADS } { incr i } { | |
99 | set test "thread $i restarted" | |
100 | gdb_test_multiple "" $test { | |
101 | -re "breakpoint here" { | |
102 | # The prompt was already matched in the "continue &" | |
103 | # test above. We're now consuming asynchronous output | |
104 | # that comes after the prompt. | |
105 | pass $test | |
106 | } | |
107 | } | |
108 | } | |
109 | ||
110 | delete_breakpoints | |
111 | } | |
112 | ||
d136eff5 PA |
113 | # Run command and wait for the prompt, without end anchor. |
114 | ||
115 | proc gdb_test_no_anchor {cmd} { | |
116 | global gdb_prompt | |
117 | ||
118 | gdb_test_multiple $cmd $cmd { | |
119 | -re "$gdb_prompt " { | |
120 | pass $cmd | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | # Enable/disable debugging. | |
126 | ||
127 | proc enable_debug {enable} { | |
128 | ||
129 | # Comment out to debug problems with the test. | |
130 | return | |
131 | ||
132 | gdb_test_no_anchor "set debug infrun $enable" | |
133 | gdb_test_no_anchor "set debug displaced $enable" | |
134 | } | |
135 | ||
ede9f622 PA |
136 | # The test proper. SIGNAL_THREAD is the thread that has been elected |
137 | # to receive the SIGUSR1 signal. | |
138 | ||
139 | proc test {signal_thread} { | |
140 | global gdb_prompt | |
141 | global NUM_THREADS | |
1ed415e2 PA |
142 | global timeout |
143 | global displaced_stepping_enabled | |
ede9f622 PA |
144 | |
145 | with_test_prefix "signal_thread=$signal_thread" { | |
146 | restart | |
147 | ||
148 | # Set all threads stepping the infinite loop line in parallel. | |
149 | for {set i 2} { $i <= $NUM_THREADS } { incr i } { | |
150 | gdb_test "thread $i" \ | |
151 | "child_function.*set thread breakpoint here.*" \ | |
152 | "switch to thread $i to step it" | |
153 | ||
154 | if {$i == $signal_thread} { | |
155 | gdb_test "print signal_thread = self" " = .*" | |
156 | } | |
157 | ||
158 | gdb_test "step&" "" "set $i thread stepping" | |
159 | } | |
160 | ||
161 | gdb_test "thread 1" "Switching to .*" \ | |
162 | "switch to the main thread to queue signal" | |
163 | ||
164 | # Let the main thread queue the signal. | |
165 | gdb_breakpoint "loop_broke" | |
d136eff5 PA |
166 | |
167 | enable_debug 1 | |
168 | ||
1ed415e2 PA |
169 | # On software single-step targets that don't support displaced |
170 | # stepping, threads keep hitting each others' single-step | |
171 | # breakpoints, and then GDB needs to pause all threads to step | |
172 | # past those. The end result is that progress in the main | |
173 | # thread will be slower and it may take a bit longer for the | |
174 | # signal to be queued; bump the timeout. | |
175 | if {!$displaced_stepping_enabled && ![can_hardware_single_step]} { | |
176 | # The more threads we have, the longer it takes. | |
177 | set factor $NUM_THREADS | |
178 | } else { | |
179 | set factor 1 | |
ede9f622 | 180 | } |
1ed415e2 PA |
181 | with_timeout_factor $factor { |
182 | gdb_test "print timeout = $timeout" " = $timeout" \ | |
183 | "set timeout in the inferior" | |
184 | ||
185 | set saw_continuing 0 | |
186 | set test "continue &" | |
187 | gdb_test_multiple $test $test { | |
188 | -re "Continuing.\r\n" { | |
189 | set saw_continuing 1 | |
190 | exp_continue | |
191 | } | |
192 | -re "$gdb_prompt " { | |
193 | gdb_assert $saw_continuing $test | |
ede9f622 | 194 | } |
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195 | -re "infrun:" { |
196 | exp_continue | |
197 | } | |
198 | } | |
1ed415e2 PA |
199 | |
200 | set gotit 0 | |
201 | ||
202 | # Wait for all threads to finish their steps, and for the main | |
203 | # thread to hit the breakpoint. | |
204 | for {set i 1} { $i <= $NUM_THREADS } { incr i } { | |
205 | set test "thread $i broke out of loop" | |
206 | set gotit 0 | |
207 | gdb_test_multiple "" $test { | |
208 | -re "loop_broke" { | |
209 | # The prompt was already matched in the "continue | |
210 | # &" test above. We're now consuming asynchronous | |
211 | # output that comes after the prompt. | |
212 | set gotit 1 | |
213 | pass $test | |
214 | } | |
215 | -re "infrun:" { | |
216 | exp_continue | |
217 | } | |
218 | } | |
219 | if {!$gotit} { | |
220 | break | |
221 | } | |
ede9f622 PA |
222 | } |
223 | } | |
224 | ||
d136eff5 PA |
225 | enable_debug 0 |
226 | ||
ede9f622 PA |
227 | # It's helpful to have this in the log if the test ever |
228 | # happens to fail. | |
229 | gdb_test "info threads" | |
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230 | |
231 | return $gotit | |
ede9f622 PA |
232 | } |
233 | } | |
234 | ||
235 | # The kernel/debug API may always walk its thread list looking for the | |
236 | # first with an event, resulting in giving priority to e.g. the thread | |
237 | # with lowest kernel thread ID. So test once with the signal pending | |
238 | # in each thread, except the main thread. | |
239 | for {set i 2} { $i <= $NUM_THREADS } { incr i } { | |
d136eff5 PA |
240 | if {![test $i]} { |
241 | # Avoid cascading timeouts, and bail out. | |
242 | return | |
243 | } | |
ede9f622 | 244 | } |