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

   1 # Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   2 # Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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
  42 # This only works with Linux configurations.
  43 if ![istarget *-*-linux-gnu*] then {
  44     return
  45 }
  46
  47 set testfile "linux-dp"
  48 set srcfile ${testfile}.c
  49 set binfile ${objdir}/${subdir}/${testfile}
  50 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != ""} {
  51     return -1
  52 }
  53
  54 gdb_start
  55 gdb_reinitialize_dir $srcdir/$subdir
  56 gdb_load ${binfile}
  57 gdb_test_no_output "set print sevenbit-strings"
  58 runto_main
  59
  60 # There should be no threads initially.
  61 gdb_test "info threads" "" "info threads 1"
  62
  63 # Try stepping over the thread creation function.
  64 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]
  65 set expect_manager -1
  66 for {set i 0} {$i < 5} {incr i} {
  67     gdb_continue_to_breakpoint "about to create philosopher: $i"
  68     set threads_before {}
  69     gdb_test_multiple "info threads" "info threads before: $i" {
  70         -re "info threads\r\n" {
  71             exp_continue
  72         }
  73         -re "^. +(\[0-9\]+ Thread \[-0-9a-fx\]+) \[^\n\]*\n" {
  74             verbose -log "found thread $expect_out(1,string)" 2
  75             lappend threads_before $expect_out(1,string)
  76             exp_continue
  77         }
  78         -re "^\[^\n\]*\n" {
  79             verbose -log "skipping line" 2
  80             exp_continue -continue_timer
  81         }
  82         -re "^$gdb_prompt $" {
  83         }
  84     }
  85     set threads_created 0
  86     gdb_test_multiple "next" "create philosopher: $i" {
  87         -re "^next\r\n" {
  88             exp_continue
  89         }
  90         -re "^ *\[_!\] \[0-9\]* \[_!\]\r\n" {
  91             # Ignore program output.
  92             exp_continue -continue_timer
  93         }
  94         -re "^\\\[New \[^\]\n\]+\\\]\[^\n\]+\n" {
  95             incr threads_created
  96             exp_continue
  97         }
  98         -re "^189\[^\n\]+\n" {
  99             exp_continue
 100         }
 101         -re "^$gdb_prompt $" {
 102         }
 103         -re "Program received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" {
 104             # It would be nice if we could catch the message that GDB prints
 105             # when it first notices that the thread library doesn't support
 106             # debugging, or if we could explicitly ask GDB somehow.
 107             unsupported "This GDB does not support threads on this system."
 108             return -1
 109         }
 110         -re "$gdb_prompt $" {
 111         }
 112     }
 113     if { $threads_created == 0 } {
 114         # Not all targets announce new threads as they are created.
 115         # For example, the GDB
 116         # remote protocol target only finds out about threads when
 117         # they actually report some event like a breakpoint hit,
 118         # or when the user types 'info threads'.
 119         unsupported "create philosopher: $i"
 120     } elseif { $threads_created == 1 } {
 121         if { $expect_manager < 0 } {
 122             set expect_manager 0
 123         }
 124         pass "create philosopher: $i"
 125     } elseif { !$i && $threads_created == 2 } {
 126         # Two threads are created the first time in LinuxThreads,
 127         # where the second is the manager thread.  In NPTL, there is none.
 128         set expect_manager 1
 129         pass "create philosopher: $i"
 130     } else {
 131         fail "create philosopher: $i"
 132     }
 133
 134     set threads_after {}
 135     gdb_test_multiple "info threads" "info threads after: $i" {
 136         -re "info threads\r\n" {
 137             exp_continue
 138         }
 139         -re "^. +(\[0-9\]+ Thread \[-0-9a-fx\]+) \[^\n\]*\n" {
 140             set name $expect_out(1,string)
 141             for {set j 0} {$j != [llength $threads_before] } {incr j} {
 142                 if {$name == [lindex $threads_before $j]} {
 143                     set threads_before [lreplace $threads_before $j $j]
 144                     set name ""
 145                     break
 146                 }
 147             }
 148             if { $name != "" } {
 149                 lappend threads_after $name
 150             }
 151             exp_continue
 152         }
 153         -re "^\[^\n\]*\n" {
 154             verbose -log "skipping line" 2
 155             exp_continue -continue_timer
 156         }
 157         -re "^$gdb_prompt $" {
 158             if { [llength $threads_before] != 0 } {
 159                 fail "info threads after: $i"
 160             } elseif { !$i && [llength $threads_after] == 2 } {
 161                 set expect_manager 1
 162                 pass "info threads after: $i"
 163             } elseif { [llength $threads_after] == 1 } {
 164                 if { $expect_manager < 0 } {
 165                     set expect_manager 0
 166                 }
 167                 pass "info threads after: $i"
 168             } else {
 169                 fail "info threads after: $i"
 170             }
 171         }
 172     }
 173 }
 174
 175 set nthreads 6
 176
 177 # Run until there are some threads.
 178 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
 179 gdb_continue_to_breakpoint "main thread's sleep"
 180 set info_threads_ptn ""
 181 for {set i $nthreads} {$i > 0} {incr i -1} {
 182     append info_threads_ptn "$i Thread .*"
 183 }
 184 append info_threads_ptn "\[\r\n\]+$gdb_prompt $"
 185 set info_threads_manager_ptn "[expr $nthreads + 1] Thread .*$info_threads_ptn"
 186
 187 gdb_test_multiple "info threads" "info threads 2" {
 188     -re "$info_threads_manager_ptn" {
 189         # We did see a manager thread.  Check that against what we expected.
 190         switch -exact -- $expect_manager {
 191             -1 {
 192                 # We weren't sure whether to expect a manager thread.
 193                 pass "info threads 2"
 194             }
 195             1 {
 196                 # We were expecting a manager thread.
 197                 pass "info threads 2"
 198             }
 199             0 {
 200                 # We were not expecting to see the manager thread.
 201                 fail "info threads 2"
 202             }
 203         }
 204         set expect_manager 1
 205         incr nthreads
 206     }
 207     -re "$info_threads_ptn" {
 208         # We did not see a manager thread.  Check that against what we
 209         # expected.
 210         switch -exact -- $expect_manager {
 211             -1 {
 212                 # We weren't sure whether to expect a manager thread.
 213                 # Don't expect it from here on out.
 214                 pass "info threads 2"
 215             }
 216             1 {
 217                 # We were expecting a manager thread, but we didn't see one.
 218                 fail "info threads 2"
 219             }
 220             0 {
 221                 # We were not expecting to see the manager thread.
 222                 pass "info threads 2"
 223             }
 224         }
 225         set expect_manager 0
 226     }
 227 }
 228
 229
 230 # Try setting a thread-specific breakpoint.
 231 gdb_breakpoint "print_philosopher thread 5"
 232 gdb_continue_to_breakpoint "thread 5's print"
 233 # When there is no debugging info available for the thread library,
 234 # the backtrace entry for philosopher's caller looks like:
 235 #    #2  0x4001c548 in pthread_create () from /lib/libpthread.so.0
 236 # If you do have debug info, the output obviously depends more on the
 237 # exact library in use; under NPTL, you get:
 238 #    #2  0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264
 239 gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\|in pthread_create\).*" \
 240         "first thread-specific breakpoint hit"
 241
 242 # Make sure it's catching the right thread.  Try hitting the
 243 # breakpoint ten times, and make sure we don't get anyone else.
 244 set only_five 1
 245 for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
 246     gdb_continue_to_breakpoint "thread 5's print, pass: $i"
 247     gdb_test_multiple "info threads" "" {
 248         -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {
 249             # Okay this time.
 250         }
 251         -re ".*$gdb_prompt $" {
 252             set only_five 0
 253         }
 254         timeout {
 255             set only_five -1
 256         }
 257     }
 258 }
 259
 260 set name "thread-specific breakpoint is thread-specific"
 261 if {$only_five ==  1} { pass $name }
 262 if {$only_five ==  0} { fail $name }
 263 if {$only_five == -1} { fail "$name (timeout)" }
 264
 265
 266 ### Select a particular thread.
 267 proc select_thread {thread} {
 268     global gdb_prompt
 269
 270     gdb_test "thread $thread" \
 271         "\\\[Switching to thread .*\\\].*" \
 272         "selected thread: $thread"
 273 }
 274
 275 ### Select THREAD, check for a plausible backtrace, and make sure
 276 ### we're actually selecting a different philosopher each time.
 277 ### Return true if the thread had a stack which was not only
 278 ### acceptable, but interesting.  SEEN should be an array in which
 279 ### SEEN(N) exists iff we have found philosopher number N before.
 280
 281 set main_seen 0
 282 set manager_seen 0
 283
 284 proc check_philosopher_stack {thread seen_name} {
 285     global gdb_prompt
 286     upvar $seen_name seen
 287     global main_seen
 288     global expect_manager manager_seen
 289
 290     set name "philosopher is distinct: $thread"
 291     set interesting 0
 292
 293     select_thread $thread
 294     gdb_test_multiple "where" "$name" {
 295         -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 296             set data $expect_out(1,string)
 297             if {[info exists seen($data)]} {
 298                 fail $name
 299             } else {
 300                 pass $name
 301                 set seen($data) yep
 302             }
 303             set interesting 1
 304         }
 305         -re ".* in __pthread_manager \\(.*$gdb_prompt $" {
 306             if {$manager_seen == 1} {
 307                 fail "manager thread is distinct: $thread"
 308             } else {
 309                 set manager_seen 1
 310                 pass "manager thread is distinct: $thread"
 311             }
 312             set interesting 1
 313         }
 314         -re "pthread_start_thread.*\r\n$gdb_prompt $" {
 315             ## Maybe the thread hasn't started yet.
 316             pass $name
 317         }
 318         -re ".* in main \\(.*$gdb_prompt $" {
 319             if {$main_seen == 1} {
 320                 fail "main is distinct: $thread"
 321             } else {
 322                 set main_seen 1
 323                 pass "main is distinct: $thread"
 324             }
 325             set interesting 1
 326         }
 327         -re " in \\?\\?.*\r\n$gdb_prompt $" {
 328             ## Sometimes we can't get a backtrace.  I'm going to call
 329             ## this a pass, since we do verify that at least one
 330             ## thread was interesting, so we can get more consistent
 331             ## test suite totals.  But in my heart, I think it should
 332             ## be an xfail.
 333             pass $name
 334         }
 335     }
 336
 337     return $interesting
 338 }
 339
 340 set any_interesting 0
 341 array set seen {}
 342 unset seen
 343 for {set i 1} {$i <= $nthreads} {incr i} {
 344     if [check_philosopher_stack $i seen] {
 345         set any_interesting 1
 346     }
 347 }
 348
 349 if {$any_interesting} {
 350     pass "found an interesting thread"
 351 } else {
 352     fail "found an interesting thread"
 353 }
 354
 355 if {$manager_seen == $expect_manager} {
 356     pass "manager thread found (not found) when expected"
 357 } else {
 358     fail "manager thread found (not found) when expected"
 359 }