1# Copyright 1999-2020 Free Software Foundation, Inc. 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# Please email any bugs, comments, and/or additions to this file to: 17# bug-gdb@gnu.org 18 19#### Dining Philosophers, on LinuxThreads - Jim Blandy <jimb@cygnus.com> 20#### 21#### At the moment, GDB's support for LinuxThreads is pretty 22#### idiosyncratic --- GDB's output doesn't look much like the output 23#### it produces for other thread implementations, messages appear at 24#### different times, etc. So these tests are specific to LinuxThreads. 25#### 26#### However, if all goes well, Linux will soon have a libthread_db 27#### interface, and GDB will manage it the same way it does other 28#### libthread_db-based systems. Then, we can adjust this file to 29#### work with any such system. 30 31### Other things we ought to test: 32### stepping a thread while others are running 33### killing and restarting 34### quitting gracefully 35 36 37# This only works with Linux configurations. 38if ![istarget *-*-linux-gnu*] then { 39 return 40} 41 42standard_testfile 43if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != ""} { 44 return -1 45} 46 47clean_restart ${binfile} 48gdb_test_no_output "set print sevenbit-strings" 49runto_main 50 51# There should be no threads initially. 52gdb_test "info threads" ".*" "info threads 1" 53 54# Try stepping over the thread creation function. 55gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"] 56set expect_manager -1 57for {set i 0} {$i < 5} {incr i} { 58 gdb_continue_to_breakpoint "about to create philosopher: $i" 59 set threads_before {} 60 gdb_test_multiple "info threads" "info threads before: $i" { 61 -re "info threads\r\n" { 62 exp_continue 63 } 64 -re "^ *Id.*Frame *\[\r\n\]+" { 65 exp_continue 66 } 67 -re "^. +(\[0-9\]+ *Thread \[-0-9a-fx.\]+) \[^\n\]*\n" { 68 verbose -log "found thread $expect_out(1,string)" 2 69 lappend threads_before $expect_out(1,string) 70 exp_continue 71 } 72 -re "^\[^\n\]*\n" { 73 verbose -log "skipping line" 2 74 exp_continue -continue_timer 75 } 76 -re "^$gdb_prompt $" { 77 } 78 } 79 set threads_created 0 80 gdb_test_multiple "next" "create philosopher: $i" { 81 -re "^next\r\n" { 82 exp_continue 83 } 84 -re "^ *\[_!\] \[0-9\]* \[_!\]\r\n" { 85 # Ignore program output. 86 exp_continue -continue_timer 87 } 88 -re "^\\\[New \[^\]\n\]+\\\]\[^\n\]+\n" { 89 incr threads_created 90 exp_continue 91 } 92 -re "^189\[^\n\]+\n" { 93 exp_continue 94 } 95 -re "^$gdb_prompt $" { 96 } 97 -re " received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" { 98 # It would be nice if we could catch the message that GDB prints 99 # when it first notices that the thread library doesn't support 100 # debugging, or if we could explicitly ask GDB somehow. 101 unsupported "this GDB does not support threads on this system." 102 return -1 103 } 104 -re "$gdb_prompt $" { 105 } 106 } 107 if { $threads_created == 1 } { 108 if { $expect_manager < 0 } { 109 set expect_manager 0 110 } 111 pass "create philosopher: $i" 112 } elseif { !$i && $threads_created == 2 } { 113 # Two threads are created the first time in LinuxThreads, 114 # where the second is the manager thread. In NPTL, there is none. 115 set expect_manager 1 116 pass "create philosopher: $i" 117 } else { 118 fail "create philosopher: $i" 119 } 120 121 set threads_after {} 122 gdb_test_multiple "info threads" "info threads after: $i" { 123 -re "info threads\r\n" { 124 exp_continue 125 } 126 -re "^ *Id.*Frame *\[\r\n\]+" { 127 exp_continue 128 } 129 -re "^. +(\[0-9\]+ *Thread \[-0-9a-fx.\]+) \[^\n\]*\n" { 130 set name $expect_out(1,string) 131 for {set j 0} {$j != [llength $threads_before] } {incr j} { 132 if {$name == [lindex $threads_before $j]} { 133 set threads_before [lreplace $threads_before $j $j] 134 set name "" 135 break 136 } 137 } 138 if { $name != "" } { 139 lappend threads_after $name 140 } 141 exp_continue 142 } 143 -re "^\[^\n\]*\n" { 144 verbose -log "skipping line" 2 145 exp_continue -continue_timer 146 } 147 -re "^$gdb_prompt $" { 148 if { [llength $threads_before] != 0 } { 149 fail "info threads after: $i" 150 } elseif { !$i && [llength $threads_after] == 2 } { 151 set expect_manager 1 152 pass "info threads after: $i" 153 } elseif { [llength $threads_after] == 1 } { 154 if { $expect_manager < 0 } { 155 set expect_manager 0 156 } 157 pass "info threads after: $i" 158 } else { 159 fail "info threads after: $i" 160 } 161 } 162 } 163} 164 165set nthreads 6 166 167# Run until there are some threads. 168gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"] 169gdb_continue_to_breakpoint "main thread's sleep" 170set info_threads_ptn ".*" 171for {set i 1} {$i < $nthreads} {incr i} { 172 append info_threads_ptn "$i *Thread .*" 173} 174append info_threads_ptn "\[\r\n\]+$gdb_prompt $" 175set info_threads_manager_ptn "[expr $nthreads + 1] *Thread .*$info_threads_ptn" 176 177gdb_test_multiple "info threads" "info threads 2" { 178 -re "$info_threads_manager_ptn" { 179 # We did see a manager thread. Check that against what we expected. 180 switch -exact -- $expect_manager { 181 -1 { 182 # We weren't sure whether to expect a manager thread. 183 pass "info threads 2" 184 } 185 1 { 186 # We were expecting a manager thread. 187 pass "info threads 2" 188 } 189 0 { 190 # We were not expecting to see the manager thread. 191 fail "info threads 2" 192 } 193 } 194 set expect_manager 1 195 incr nthreads 196 } 197 -re "$info_threads_ptn" { 198 # We did not see a manager thread. Check that against what we 199 # expected. 200 switch -exact -- $expect_manager { 201 -1 { 202 # We weren't sure whether to expect a manager thread. 203 # Don't expect it from here on out. 204 pass "info threads 2" 205 } 206 1 { 207 # We were expecting a manager thread, but we didn't see one. 208 fail "info threads 2" 209 } 210 0 { 211 # We were not expecting to see the manager thread. 212 pass "info threads 2" 213 } 214 } 215 set expect_manager 0 216 } 217} 218 219 220# Try setting a thread-specific breakpoint. 221gdb_breakpoint "print_philosopher thread 5" 222gdb_continue_to_breakpoint "thread 5's print" 223# When there is no debugging info available for the thread library, 224# the backtrace entry for philosopher's caller looks like: 225# #2 0x4001c548 in pthread_create () from /lib/libpthread.so.0 226# If you do have debug info, the output obviously depends more on the 227# exact library in use; under NPTL, you get: 228# #2 0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264 229gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\|in pthread_create\).*" \ 230 "first thread-specific breakpoint hit" 231 232# Make sure it's catching the right thread. Try hitting the 233# breakpoint ten times, and make sure we don't get anyone else. 234set only_five 1 235for {set i 0} {$only_five > 0 && $i < 10} {incr i} { 236 gdb_continue_to_breakpoint "thread 5's print, pass: $i" 237 gdb_test_multiple "info threads" "" { 238 -re "\[*\] 5 *Thread .* +print_philosopher .*\r\n$gdb_prompt $" { 239 # Okay this time. 240 } 241 -re ".*$gdb_prompt $" { 242 set only_five 0 243 } 244 timeout { 245 set only_five -1 246 } 247 } 248} 249 250set name "thread-specific breakpoint is thread-specific" 251if {$only_five == 1} { pass $name } 252if {$only_five == 0} { fail $name } 253if {$only_five == -1} { fail "$name (timeout)" } 254 255 256### Select a particular thread. 257proc select_thread {thread} { 258 global gdb_prompt 259 260 gdb_test "thread $thread" \ 261 "\\\[Switching to thread .*\\\].*" \ 262 "selected thread: $thread" 263} 264 265### Select THREAD, check for a plausible backtrace, and make sure 266### we're actually selecting a different philosopher each time. 267### Return true if the thread had a stack which was not only 268### acceptable, but interesting. SEEN should be an array in which 269### SEEN(N) exists iff we have found philosopher number N before. 270 271set main_seen 0 272set manager_seen 0 273 274proc check_philosopher_stack {thread seen_name} { 275 global gdb_prompt 276 upvar $seen_name seen 277 global main_seen 278 global expect_manager manager_seen 279 280 set name "philosopher is distinct: $thread" 281 set interesting 0 282 283 select_thread $thread 284 gdb_test_multiple "where" "$name" { 285 -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" { 286 set data $expect_out(1,string) 287 if {[info exists seen($data)]} { 288 fail $name 289 } else { 290 pass $name 291 set seen($data) yep 292 } 293 set interesting 1 294 } 295 -re ".* in __pthread_manager \\(.*$gdb_prompt $" { 296 if {$manager_seen == 1} { 297 fail "manager thread is distinct: $thread" 298 } else { 299 set manager_seen 1 300 pass "manager thread is distinct: $thread" 301 } 302 set interesting 1 303 } 304 -re "pthread_start_thread.*\r\n$gdb_prompt $" { 305 ## Maybe the thread hasn't started yet. 306 pass $name 307 } 308 -re ".* in main \\(.*$gdb_prompt $" { 309 if {$main_seen == 1} { 310 fail "main is distinct: $thread" 311 } else { 312 set main_seen 1 313 pass "main is distinct: $thread" 314 } 315 set interesting 1 316 } 317 -re " in \\?\\?.*\r\n$gdb_prompt $" { 318 ## Sometimes we can't get a backtrace. I'm going to call 319 ## this a pass, since we do verify that at least one 320 ## thread was interesting, so we can get more consistent 321 ## test suite totals. But in my heart, I think it should 322 ## be an xfail. 323 pass $name 324 } 325 } 326 327 return $interesting 328} 329 330set any_interesting 0 331catch {unset seen} 332array set seen {} 333for {set i 1} {$i <= $nthreads} {incr i} { 334 if [check_philosopher_stack $i seen] { 335 set any_interesting 1 336 } 337} 338unset seen 339 340if {$any_interesting} { 341 pass "found an interesting thread" 342} else { 343 fail "found an interesting thread" 344} 345 346if {$manager_seen == $expect_manager} { 347 pass "manager thread found (not found) when expected" 348} else { 349 fail "manager thread found (not found) when expected" 350} 351