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618f726f | 1 | # Copyright (C) 2014-2016 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 | ||
22 | if [target_info exists gdb,nosignals] { | |
23 | verbose "Skipping ${testfile}.exp because of nosignals." | |
24 | return -1 | |
25 | } | |
26 | ||
337532fa YQ |
27 | set options { "additional_flags=-DTIMEOUT=$timeout" debug pthreads } |
28 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile $options] == -1} { | |
ede9f622 PA |
29 | return -1 |
30 | } | |
31 | ||
32 | gdb_test_no_output "set non-stop on" | |
33 | ||
34 | if ![runto_main] { | |
35 | return -1 | |
36 | } | |
37 | ||
38 | # We want "handle print", to make sure the target backend reports the | |
39 | # signal to the run control core. | |
40 | gdb_test "handle SIGUSR1 print nostop pass" "" | |
41 | ||
42 | # Get current value of VAR from the inferior. TEST is used as test | |
43 | # message. | |
44 | ||
45 | proc get_value {var test} { | |
46 | global expect_out | |
47 | global gdb_prompt | |
48 | global decimal | |
49 | ||
50 | set value -1 | |
51 | gdb_test_multiple "print $var" "$test" { | |
52 | -re ".*= ($decimal).*\r\n$gdb_prompt $" { | |
53 | set value $expect_out(1,string) | |
54 | pass "$test" | |
55 | } | |
56 | } | |
57 | return ${value} | |
58 | } | |
59 | ||
60 | set NUM_THREADS [get_value "num_threads" "get num_threads"] | |
61 | ||
62 | # Account for the main thread. | |
63 | incr NUM_THREADS | |
64 | ||
1ed415e2 PA |
65 | # Probe for displaced stepping support. We're stopped at the main |
66 | # breakpoint. If displaced stepping is supported, we should see | |
67 | # related debug output. | |
68 | set displaced_stepping_enabled 0 | |
69 | set msg "check displaced-stepping" | |
70 | gdb_test_no_output "set debug displaced 1" | |
71 | gdb_test_multiple "next" $msg { | |
72 | -re "displaced pc to.*$gdb_prompt $" { | |
73 | set displaced_stepping_enabled 1 | |
74 | } | |
75 | -re ".*$gdb_prompt $" { | |
76 | } | |
77 | } | |
78 | gdb_test_no_output "set debug displaced 0" | |
79 | ||
ede9f622 PA |
80 | # Run threads to their start positions. This prepares for a new test |
81 | # sequence. | |
82 | ||
83 | proc restart {} { | |
84 | global gdb_prompt | |
85 | global NUM_THREADS | |
86 | ||
87 | delete_breakpoints | |
88 | ||
89 | gdb_test "print got_sig = 0" " = 0" | |
90 | ||
91 | gdb_breakpoint [gdb_get_line_number "set thread breakpoint here"] | |
92 | gdb_breakpoint [gdb_get_line_number "set kill breakpoint here"] | |
93 | ||
94 | set test "continue -a&" | |
95 | gdb_test_multiple $test $test { | |
96 | -re "Continuing.\r\n$gdb_prompt " { | |
97 | pass $test | |
98 | } | |
99 | } | |
100 | ||
101 | for {set i 1} { $i <= $NUM_THREADS } { incr i } { | |
102 | set test "thread $i restarted" | |
103 | gdb_test_multiple "" $test { | |
104 | -re "breakpoint here" { | |
105 | # The prompt was already matched in the "continue &" | |
106 | # test above. We're now consuming asynchronous output | |
107 | # that comes after the prompt. | |
108 | pass $test | |
109 | } | |
110 | } | |
111 | } | |
112 | ||
113 | delete_breakpoints | |
114 | } | |
115 | ||
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116 | # Run command and wait for the prompt, without end anchor. |
117 | ||
118 | proc gdb_test_no_anchor {cmd} { | |
119 | global gdb_prompt | |
120 | ||
121 | gdb_test_multiple $cmd $cmd { | |
122 | -re "$gdb_prompt " { | |
123 | pass $cmd | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | # Enable/disable debugging. | |
129 | ||
130 | proc enable_debug {enable} { | |
131 | ||
132 | # Comment out to debug problems with the test. | |
133 | return | |
134 | ||
135 | gdb_test_no_anchor "set debug infrun $enable" | |
136 | gdb_test_no_anchor "set debug displaced $enable" | |
137 | } | |
138 | ||
ede9f622 PA |
139 | # The test proper. SIGNAL_THREAD is the thread that has been elected |
140 | # to receive the SIGUSR1 signal. | |
141 | ||
142 | proc test {signal_thread} { | |
143 | global gdb_prompt | |
144 | global NUM_THREADS | |
1ed415e2 PA |
145 | global timeout |
146 | global displaced_stepping_enabled | |
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147 | |
148 | with_test_prefix "signal_thread=$signal_thread" { | |
149 | restart | |
150 | ||
151 | # Set all threads stepping the infinite loop line in parallel. | |
152 | for {set i 2} { $i <= $NUM_THREADS } { incr i } { | |
153 | gdb_test "thread $i" \ | |
154 | "child_function.*set thread breakpoint here.*" \ | |
155 | "switch to thread $i to step it" | |
156 | ||
157 | if {$i == $signal_thread} { | |
158 | gdb_test "print signal_thread = self" " = .*" | |
159 | } | |
160 | ||
161 | gdb_test "step&" "" "set $i thread stepping" | |
162 | } | |
163 | ||
164 | gdb_test "thread 1" "Switching to .*" \ | |
165 | "switch to the main thread to queue signal" | |
166 | ||
167 | # Let the main thread queue the signal. | |
168 | gdb_breakpoint "loop_broke" | |
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169 | |
170 | enable_debug 1 | |
171 | ||
1ed415e2 PA |
172 | # On software single-step targets that don't support displaced |
173 | # stepping, threads keep hitting each others' single-step | |
174 | # breakpoints, and then GDB needs to pause all threads to step | |
175 | # past those. The end result is that progress in the main | |
176 | # thread will be slower and it may take a bit longer for the | |
177 | # signal to be queued; bump the timeout. | |
178 | if {!$displaced_stepping_enabled && ![can_hardware_single_step]} { | |
179 | # The more threads we have, the longer it takes. | |
180 | set factor $NUM_THREADS | |
181 | } else { | |
182 | set factor 1 | |
ede9f622 | 183 | } |
1ed415e2 PA |
184 | with_timeout_factor $factor { |
185 | gdb_test "print timeout = $timeout" " = $timeout" \ | |
186 | "set timeout in the inferior" | |
187 | ||
188 | set saw_continuing 0 | |
189 | set test "continue &" | |
190 | gdb_test_multiple $test $test { | |
191 | -re "Continuing.\r\n" { | |
192 | set saw_continuing 1 | |
193 | exp_continue | |
194 | } | |
195 | -re "$gdb_prompt " { | |
196 | gdb_assert $saw_continuing $test | |
ede9f622 | 197 | } |
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198 | -re "infrun:" { |
199 | exp_continue | |
200 | } | |
201 | } | |
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202 | |
203 | set gotit 0 | |
204 | ||
205 | # Wait for all threads to finish their steps, and for the main | |
206 | # thread to hit the breakpoint. | |
207 | for {set i 1} { $i <= $NUM_THREADS } { incr i } { | |
208 | set test "thread $i broke out of loop" | |
209 | set gotit 0 | |
210 | gdb_test_multiple "" $test { | |
211 | -re "loop_broke" { | |
212 | # The prompt was already matched in the "continue | |
213 | # &" test above. We're now consuming asynchronous | |
214 | # output that comes after the prompt. | |
215 | set gotit 1 | |
216 | pass $test | |
217 | } | |
218 | -re "infrun:" { | |
219 | exp_continue | |
220 | } | |
221 | } | |
222 | if {!$gotit} { | |
223 | break | |
224 | } | |
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225 | } |
226 | } | |
227 | ||
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228 | enable_debug 0 |
229 | ||
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230 | # It's helpful to have this in the log if the test ever |
231 | # happens to fail. | |
232 | gdb_test "info threads" | |
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233 | |
234 | return $gotit | |
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235 | } |
236 | } | |
237 | ||
238 | # The kernel/debug API may always walk its thread list looking for the | |
239 | # first with an event, resulting in giving priority to e.g. the thread | |
240 | # with lowest kernel thread ID. So test once with the signal pending | |
241 | # in each thread, except the main thread. | |
242 | for {set i 2} { $i <= $NUM_THREADS } { incr i } { | |
d136eff5 PA |
243 | if {![test $i]} { |
244 | # Avoid cascading timeouts, and bail out. | |
245 | return | |
246 | } | |
ede9f622 | 247 | } |