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

   1 # Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   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 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 \[-0-9a-fx\]+) \[^\n\]*\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 "^ *\[_!\] \[0-9\]* \[_!\]\r\n" {
  97             # Ignore program output.
  98             exp_continue -continue_timer
  99         }
 100         -re "^\\\[New \[^\]\n\]+\\\]\[^\n\]+\n" {
 101             incr threads_created
 102             exp_continue
 103         }
 104         -re "^189\[^\n\]+\n" {
 105             exp_continue
 106         }
 107         -re "^$gdb_prompt $" {
 108         }
 109         -re "Program received signal.*(Unknown signal|SIGUSR|Real-time event).*$gdb_prompt $" {
 110             # It would be nice if we could catch the message that GDB prints
 111             # when it first notices that the thread library doesn't support
 112             # debugging, or if we could explicitly ask GDB somehow.
 113             unsupported "This GDB does not support threads on this system."
 114             return -1
 115         }
 116         -re "$gdb_prompt $" {
 117         }
 118         timeout {
 119             fail "(timeout) create philosopher: $i"
 120         }
 121     }
 122     if { $threads_created == 0 } {
 123         # Not all targets announce new threads as they are created.
 124         # For example, the GDB
 125         # remote protocol target only finds out about threads when
 126         # they actually report some event like a breakpoint hit,
 127         # or when the user types 'info threads'.
 128         unsupported "create philosopher: $i"
 129     } elseif { $threads_created == 1 } {
 130         if { $expect_manager < 0 } {
 131             set expect_manager 0
 132         }
 133         pass "create philosopher: $i"
 134     } elseif { !$i && $threads_created == 2 } {
 135         # Two threads are created the first time in LinuxThreads,
 136         # where the second is the manager thread.  In NPTL, there is none.
 137         set expect_manager 1
 138         pass "create philosopher: $i"
 139     } else {
 140         fail "create philosopher: $i"
 141     }
 142
 143     send_gdb "info threads\n"
 144     set threads_after {}
 145     gdb_expect {
 146         -re "info threads\r\n" {
 147             exp_continue
 148         }
 149         -re "^. +(\[0-9\]+ Thread \[-0-9a-fx\]+) \[^\n\]*\n" {
 150             set name $expect_out(1,string)
 151             for {set j 0} {$j != [llength $threads_before] } {incr j} {
 152                 if {$name == [lindex $threads_before $j]} {
 153                     set threads_before [lreplace $threads_before $j $j]
 154                     set name ""
 155                     break
 156                 }
 157             }
 158             if { $name != "" } {
 159                 lappend threads_after $name
 160             }
 161             exp_continue
 162         }
 163         -re "^\[^\n\]*\n" {
 164             verbose -log "skipping line" 2
 165         }
 166         -re "^$gdb_prompt $" {
 167             if { [llength $threads_before] != 0 } {
 168                 fail "info threads after: $i"
 169             } elseif { !$i && [llength $threads_after] == 2 } {
 170                 set expect_manager 1
 171                 pass "info threads after: $i"
 172             } elseif { [llength $threads_after] == 1 } {
 173                 if { $expect_manager < 0 } {
 174                     set expect_manager 0
 175                 }
 176                 pass "info threads after: $i"
 177             } else {
 178                 fail "info threads after: $i"
 179             }
 180         }
 181         timeout {
 182             fail "(timeout) info threads after: $i"
 183         }
 184     }
 185
 186 }
 187
 188 set nthreads 6
 189
 190 # Run until there are some threads.
 191 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
 192 gdb_continue_to_breakpoint "main thread's sleep"
 193 set info_threads_ptn ""
 194 for {set i $nthreads} {$i > 0} {incr i -1} {
 195     append info_threads_ptn "$i Thread .*"
 196 }
 197 append info_threads_ptn "\[\r\n\]+$gdb_prompt $"
 198 set info_threads_manager_ptn "[expr $nthreads + 1] Thread .*$info_threads_ptn"
 199
 200 gdb_test_multiple "info threads" "info threads 2" {
 201     -re "$info_threads_manager_ptn" {
 202         # We did see a manager thread.  Check that against what we expected.
 203         switch -exact -- $expect_manager {
 204             -1 {
 205                 # We weren't sure whether to expect a manager thread.
 206                 pass "info threads 2"
 207             }
 208             1 {
 209                 # We were expecting a manager thread.
 210                 pass "info threads 2"
 211             }
 212             0 {
 213                 # We were not expecting to see the manager thread.
 214                 fail "info threads 2"
 215             }
 216         }
 217         set expect_manager 1
 218         incr nthreads
 219     }
 220     -re "$info_threads_ptn" {
 221         # We did not see a manager thread.  Check that against what we
 222         # expected.
 223         switch -exact -- $expect_manager {
 224             -1 {
 225                 # We weren't sure whether to expect a manager thread.
 226                 # Don't expect it from here on out.
 227                 pass "info threads 2"
 228             }
 229             1 {
 230                 # We were expecting a manager thread, but we didn't see one.
 231                 fail "info threads 2"
 232             }
 233             0 {
 234                 # We were not expecting to see the manager thread.
 235                 pass "info threads 2"
 236             }
 237         }
 238         set expect_manager 0
 239     }
 240 }
 241
 242
 243 # Try setting a thread-specific breakpoint.
 244 gdb_breakpoint "print_philosopher thread 5"
 245 gdb_continue_to_breakpoint "thread 5's print"
 246 # When there is no debugging info available for the thread library,
 247 # the backtrace entry for philosopher's caller looks like:
 248 #    #1  0x4001c548 in pthread_create () from /lib/libpthread.so.0
 249 # If you do have debug info, the output obviously depends more on the
 250 # exact library in use; under NPTL, you get:
 251 #    #2  0x0012b7fc in start_thread (arg=0x21) at pthread_create.c:264
 252 gdb_test "where" "print_philosopher.*philosopher.* \(from .*libpthread\|at pthread_create\).*" \
 253         "first thread-specific breakpoint hit"
 254
 255 # Make sure it's catching the right thread.  Try hitting the
 256 # breakpoint ten times, and make sure we don't get anyone else.
 257 set only_five 1
 258 for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
 259     gdb_continue_to_breakpoint "thread 5's print, pass: $i"
 260     send_gdb "info threads\n"
 261     gdb_expect {
 262         -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {
 263             # Okay this time.
 264         }
 265         -re ".*$gdb_prompt $" {
 266             set only_five 0
 267         }
 268         timeout {
 269             set only_five -1
 270         }
 271     }
 272 }
 273
 274 set name "thread-specific breakpoint is thread-specific"
 275 if {$only_five ==  1} { pass $name }
 276 if {$only_five ==  0} { fail $name }
 277 if {$only_five == -1} { fail "$name (timeout)" }
 278
 279
 280 ### Select a particular thread.
 281 proc select_thread {thread} {
 282     global gdb_prompt
 283
 284     send_gdb "thread $thread\n"
 285     gdb_expect {
 286         -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
 287             pass "selected thread: $thread"
 288         }
 289         -re "$gdb_prompt $" {
 290             fail "selected thread: $thread"
 291         }
 292         timeout {
 293             fail "selected thread: $thread (timeout)"
 294         }
 295     }
 296 }
 297
 298 ### Select THREAD, check for a plausible backtrace, and make sure
 299 ### we're actually selecting a different philosopher each time.
 300 ### Return true if the thread had a stack which was not only
 301 ### acceptable, but interesting.  SEEN should be an array in which
 302 ### SEEN(N) exists iff we have found philosopher number N before.
 303
 304 set main_seen 0
 305 set manager_seen 0
 306
 307 proc check_philosopher_stack {thread seen_name} {
 308     global gdb_prompt
 309     upvar $seen_name seen
 310     global main_seen
 311     global expect_manager manager_seen
 312
 313     set name "philosopher is distinct: $thread"
 314     set interesting 0
 315
 316     select_thread $thread
 317     send_gdb "where\n"
 318     gdb_expect {
 319         -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 320             set data $expect_out(1,string)
 321             if {[info exists seen($data)]} {
 322                 fail $name
 323             } else {
 324                 pass $name
 325                 set seen($data) yep
 326             }
 327             set interesting 1
 328         }
 329         -re ".* in __pthread_manager \\(.*$gdb_prompt $" {
 330             if {$manager_seen == 1} {
 331                 fail "manager thread is distinct: $thread"
 332             } else {
 333                 set manager_seen 1
 334                 pass "manager thread is distinct: $thread"
 335             }
 336             set interesting 1
 337         }
 338         -re "pthread_start_thread.*\r\n$gdb_prompt $" {
 339             ## Maybe the thread hasn't started yet.
 340             pass $name
 341         }
 342         -re ".* in main \\(.*$gdb_prompt $" {
 343             if {$main_seen == 1} {
 344                 fail "main is distinct: $thread"
 345             } else {
 346                 set main_seen 1
 347                 pass "main is distinct: $thread"
 348             }
 349             set interesting 1
 350         }
 351         -re " in \\?\\?.*\r\n$gdb_prompt $" {
 352             ## Sometimes we can't get a backtrace.  I'm going to call
 353             ## this a pass, since we do verify that at least one
 354             ## thread was interesting, so we can get more consistent
 355             ## test suite totals.  But in my heart, I think it should
 356             ## be an xfail.
 357             pass $name
 358         }
 359         -re "$gdb_prompt $" {
 360             fail $name
 361         }
 362         timeout {
 363             fail "$name (timeout)"
 364         }
 365     }
 366
 367     return $interesting
 368 }
 369
 370 set any_interesting 0
 371 array set seen {}
 372 unset seen
 373 for {set i 1} {$i <= $nthreads} {incr i} {
 374     if [check_philosopher_stack $i seen] {
 375         set any_interesting 1
 376     }
 377 }
 378
 379 if {$any_interesting} {
 380     pass "found an interesting thread"
 381 } else {
 382     fail "found an interesting thread"
 383 }
 384
 385 if {$manager_seen == $expect_manager} {
 386     pass "manager thread found (not found) when expected"
 387 } else {
 388     fail "manager thread found (not found) when expected"
 389 }