gdb/testsuite/gdb.threads/linux-dp.exp

   1 # Copyright 1999, 2001, 2002, 2003 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 2 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, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16
  17 # Please email any bugs, comments, and/or additions to this file to:
  18 # bug-gdb@gnu.org
  19
  20 #### Dining Philosophers, on LinuxThreads - Jim Blandy <jimb@cygnus.com>
  21 ####
  22 #### At the moment, GDB's support for LinuxThreads is pretty
  23 #### idiosyncratic --- GDB's output doesn't look much like the output
  24 #### it produces for other thread implementations, messages appear at
  25 #### different times, etc.  So these tests are specific to LinuxThreads.
  26 ####
  27 #### However, if all goes well, Linux will soon have a libthread_db
  28 #### interface, and GDB will manage it the same way it does other
  29 #### libthread_db-based systems.  Then, we can adjust this file to
  30 #### work with any such system.
  31
  32 ### Other things we ought to test:
  33 ### stepping a thread while others are running
  34 ### killing and restarting
  35 ### quitting gracefully
  36
  37 if $tracelevel then {
  38         strace $tracelevel
  39 }
  40
  41 set prms_id 0
  42 set bug_id 0
  43
  44 # This only works with Linux configurations.
  45 if ![istarget *-*-linux-gnu*] then {
  46     return
  47 }
  48
  49 set testfile "linux-dp"
  50 set srcfile ${testfile}.c
  51 set binfile ${objdir}/${subdir}/${testfile}
  52 if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug libs=-lpthread}] != ""} {
  53     return -1
  54 }
  55
  56 gdb_start
  57 gdb_reinitialize_dir $srcdir/$subdir
  58 gdb_load ${binfile}
  59 send_gdb "set print sevenbit-strings\n" ; gdb_expect -re "$gdb_prompt $"
  60 runto_main
  61
  62 # There should be no threads initially.
  63 gdb_test "info threads" "" "info threads 1"
  64
  65 # Try stepping over the thread creation function.
  66 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]
  67 set expect_manager -1
  68 for {set i 0} {$i < 5} {incr i} {
  69     gdb_continue_to_breakpoint "about to create philosopher: $i"
  70     send_gdb "info threads\n"
  71     set threads_before {}
  72     gdb_expect {
  73         -re "info threads\r\n" {
  74             exp_continue
  75         }
  76         -re "^. +(\[0-9\]+ Thread \[-0-9\]+) \[^\n\]*\n" {
  77             verbose -log "found thread $expect_out(1,string)" 2
  78             lappend threads_before $expect_out(1,string)
  79             exp_continue
  80         }
  81         -re "^\[^\n\]*\n" {
  82             verbose -log "skipping line" 2
  83         }
  84         -re "^$gdb_prompt $" {
  85         }
  86         timeout {
  87             fail "(timeout) info threads before: $i"
  88         }
  89     }
  90     send_gdb "next\n"
  91     set threads_created 0
  92     gdb_expect {
  93         -re "^next\r\n" {
  94             exp_continue
  95         }
  96         -re "^\\\[New \[^\]\n\]+\\\]\[^\n\]+\n" {
  97             incr threads_created
  98             exp_continue
  99         }
 100         -re "^189\[^\n\]+\n" {
 101             exp_continue
 102         }
 103         -re "^$gdb_prompt $" {
 104         }
 105         -re "Program received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" {
 106             # It would be nice if we could catch the message that GDB prints
 107             # when it first notices that the thread library doesn't support
 108             # debugging, or if we could explicitly ask GDB somehow.
 109             unsupported "This GDB does not support threads on this system."
 110             return -1
 111         }
 112         -re "$gdb_prompt $" {
 113         }
 114         timeout {
 115             fail "(timeout) create philosopher: $i"
 116         }
 117     }
 118     if { $threads_created == 0 } {
 119         # Not all targets announce new threads as they are created.
 120         # For example, the GDB
 121         # remote protocol target only finds out about threads when
 122         # they actually report some event like a breakpoint hit,
 123         # or when the user types 'info threads'.
 124         unsupported "create philosopher: $i"
 125     } elseif { $threads_created == 1 } {
 126         if { $expect_manager < 0 } {
 127             set expect_manager 0
 128         }
 129         pass "create philosopher: $i"
 130     } elseif { !$i && $threads_created == 2 } {
 131         # Two threads are created the first time in LinuxThreads,
 132         # where the second is the manager thread.  In NPTL, there is none.
 133         set expect_manager 1
 134         pass "create philosopher: $i"
 135     } else {
 136         fail "create philosopher: $i"
 137     }
 138
 139     send_gdb "info threads\n"
 140     set threads_after {}
 141     gdb_expect {
 142         -re "info threads\r\n" {
 143             exp_continue
 144         }
 145         -re "^. +(\[0-9\]+ Thread \[-0-9\]+) \[^\n\]*\n" {
 146             set name $expect_out(1,string)
 147             for {set j 0} {$j != [llength $threads_before] } {incr j} {
 148                 if {$name == [lindex $threads_before $j]} {
 149                     set threads_before [lreplace $threads_before $j $j]
 150                     set name ""
 151                     break
 152                 }
 153             }
 154             if { $name != "" } {
 155                 lappend threads_after $name
 156             }
 157             exp_continue
 158         }
 159         -re "^\[^\n\]*\n" {
 160             verbose -log "skipping line" 2
 161         }
 162         -re "^$gdb_prompt $" {
 163             if { [llength $threads_before] != 0 } {
 164                 fail "info threads after: $i"
 165             } elseif { !$i && [llength $threads_after] == 2 } {
 166                 set expect_manager 1
 167                 pass "info threads after: $i"
 168             } elseif { [llength $threads_after] == 1 } {
 169                 if { $expect_manager < 0 } {
 170                     set expect_manager 0
 171                 }
 172                 pass "info threads after: $i"
 173             } else {
 174                 fail "info threads after: $i"
 175             }
 176         }
 177         timeout {
 178             fail "(timeout) info threads after: $i"
 179         }
 180     }
 181
 182 }
 183
 184 set nthreads 6
 185
 186 # Run until there are some threads.
 187 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
 188 gdb_continue_to_breakpoint "main thread's sleep"
 189 set info_threads_ptn ""
 190 for {set i $nthreads} {$i > 0} {incr i -1} {
 191     append info_threads_ptn "$i Thread .*"
 192 }
 193 append info_threads_ptn "\[\r\n\]+$gdb_prompt $"
 194 set info_threads_manager_ptn "[expr $nthreads + 1] Thread .*$info_threads_ptn"
 195
 196 gdb_test_multiple "info threads" "info threads 2" {
 197     -re "$info_threads_manager_ptn" {
 198         # We did see a manager thread.  Check that against what we expected.
 199         switch -exact -- $expect_manager {
 200             -1 {
 201                 # We weren't sure whether to expect a manager thread.
 202                 pass "info threads 2"
 203             }
 204             1 {
 205                 # We were expecting a manager thread.
 206                 pass "info threads 2"
 207             }
 208             0 {
 209                 # We were not expecting to see the manager thread.
 210                 fail "info threads 2"
 211             }
 212         }
 213         set expect_manager 1
 214         incr nthreads
 215     }
 216     -re "$info_threads_ptn" {
 217         # We did not see a manager thread.  Check that against what we
 218         # expected.
 219         switch -exact -- $expect_manager {
 220             -1 {
 221                 # We weren't sure whether to expect a manager thread.
 222                 # Don't expect it from here on out.
 223                 pass "info threads 2"
 224             }
 225             1 {
 226                 # We were expecting a manager thread, but we didn't see one.
 227                 fail "info threads 2"
 228             }
 229             0 {
 230                 # We were not expecting to see the manager thread.
 231                 pass "info threads 2"
 232             }
 233         }
 234         set expect_manager 0
 235     }
 236 }
 237
 238
 239 # Try setting a thread-specific breakpoint.
 240 gdb_breakpoint "print_philosopher thread 5"
 241 gdb_continue_to_breakpoint "thread 5's print"
 242 # When there is no debugging info available for the thread library,
 243 # the backtrace entry for philosopher's caller looks like:
 244 #    #1  0x4001c548 in pthread_create () from /lib/libpthread.so.0
 245 # If you do have debug info, the output obviously depends more on the
 246 # exact library in use; under NPTL, you get:
 247 #    #2  0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264
 248 gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\).*" \
 249         "first thread-specific breakpoint hit"
 250
 251 # Make sure it's catching the right thread.  Try hitting the
 252 # breakpoint ten times, and make sure we don't get anyone else.
 253 set only_five 1
 254 for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
 255     gdb_continue_to_breakpoint "thread 5's print, pass: $i"
 256     send_gdb "info threads\n"
 257     gdb_expect {
 258         -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {
 259             # Okay this time.
 260         }
 261         -re ".*$gdb_prompt $" {
 262             set only_five 0
 263         }
 264         timeout {
 265             set only_five -1
 266         }
 267     }
 268 }
 269
 270 set name "thread-specific breakpoint is thread-specific"
 271 if {$only_five ==  1} { pass $name }
 272 if {$only_five ==  0} { fail $name }
 273 if {$only_five == -1} { fail "$name (timeout)" }
 274
 275
 276 ### Select a particular thread.
 277 proc select_thread {thread} {
 278     global gdb_prompt
 279
 280     send_gdb "thread $thread\n"
 281     gdb_expect {
 282         -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
 283             pass "selected thread: $thread"
 284         }
 285         -re "$gdb_prompt $" {
 286             fail "selected thread: $thread"
 287         }
 288         timeout {
 289             fail "selected thread: $thread (timeout)"
 290         }
 291     }
 292 }
 293
 294 ### Select THREAD, check for a plausible backtrace, and make sure
 295 ### we're actually selecting a different philosopher each time.
 296 ### Return true if the thread had a stack which was not only
 297 ### acceptable, but interesting.  SEEN should be an array in which
 298 ### SEEN(N) exists iff we have found philosopher number N before.
 299
 300 set main_seen 0
 301 set manager_seen 0
 302
 303 proc check_philosopher_stack {thread seen_name} {
 304     global gdb_prompt
 305     upvar $seen_name seen
 306     global main_seen
 307     global expect_manager manager_seen
 308
 309     set name "philosopher is distinct: $thread"
 310     set interesting 0
 311
 312     select_thread $thread
 313     send_gdb "where\n"
 314     gdb_expect {
 315         -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 316             set data $expect_out(1,string)
 317             if {[info exists seen($data)]} {
 318                 fail $name
 319             } else {
 320                 pass $name
 321                 set seen($data) yep
 322             }
 323             set interesting 1
 324         }
 325         -re ".* in __pthread_manager \\(.*$gdb_prompt $" {
 326             if {$manager_seen == 1} {
 327                 fail "manager thread is distinct: $thread"
 328             } else {
 329                 set manager_seen 1
 330                 pass "manager thread is distinct: $thread"
 331             }
 332             set interesting 1
 333         }
 334         -re "pthread_start_thread.*\r\n$gdb_prompt $" {
 335             ## Maybe the thread hasn't started yet.
 336             pass $name
 337         }
 338         -re ".* in main \\(.*$gdb_prompt $" {
 339             if {$main_seen == 1} {
 340                 fail "main is distinct: $thread"
 341             } else {
 342                 set main_seen 1
 343                 pass "main is distinct: $thread"
 344             }
 345             set interesting 1
 346         }
 347         -re " in \\?\\?.*\r\n$gdb_prompt $" {
 348             ## Sometimes we can't get a backtrace.  I'm going to call
 349             ## this a pass, since we do verify that at least one
 350             ## thread was interesting, so we can get more consistent
 351             ## test suite totals.  But in my heart, I think it should
 352             ## be an xfail.
 353             pass $name
 354         }
 355         -re "$gdb_prompt $" {
 356             fail $name
 357         }
 358         timeout {
 359             fail "$name (timeout)"
 360         }
 361     }
 362
 363     return $interesting
 364 }
 365
 366 set any_interesting 0
 367 array set seen {}
 368 unset seen
 369 for {set i 1} {$i <= $nthreads} {incr i} {
 370     if [check_philosopher_stack $i seen] {
 371         set any_interesting 1
 372     }
 373 }
 374
 375 if {$any_interesting} {
 376     pass "found an interesting thread"
 377 } else {
 378     fail "found an interesting thread"
 379 }
 380
 381 if {$manager_seen == $expect_manager} {
 382     pass "manager thread found (not found) when expected"
 383 } else {
 384     fail "manager thread found (not found) when expected"
 385 }