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

   1 # Copyright (C) 1999 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     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
  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 $"
  60 runto_main
  61
  62 # There should be no threads initially.
  63 gdb_test "info threads" "" "info threads 1"
  64
  65 # Try stepping over the thread creation function.
  66 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: create philosopher"]
  67 for {set i 0} {$i < 5} {incr i} {
  68     gdb_continue_to_breakpoint "about to create philosopher: $i"
  69     gdb_test "next" "\\\[New Thread .*\\\].*" "create philosopher: $i"
  70 }
  71
  72 # Run until there are some threads.
  73 gdb_breakpoint [gdb_get_line_number "linuxthreads.exp: info threads 2"]
  74 gdb_continue_to_breakpoint "main thread's sleep"
  75 gdb_test "info threads" "7 Thread .*6 Thread .*5 Thread .*4 Thread .*3 Thread .*2 Thread .* \\(initial thread\\)  main \\(argc=1, argv=.*\\) at .*linux-dp.c:.*1 Thread .* \\(manager thread\\).*" "info threads 2"
  76
  77 # Try setting a thread-specific breakpoint.
  78 gdb_breakpoint "print_philosopher thread 5"
  79 gdb_continue_to_breakpoint "thread 5's print"
  80 gdb_test "where" "print_philosopher.*philosopher.*pthread_start_thread.*" \
  81         "first thread-specific breakpoint hit"
  82
  83 # Make sure it's catching the right thread.  Try hitting the
  84 # breakpoint ten times, and make sure we don't get anyone else.
  85 set only_five 1
  86 for {set i 0} {$only_five > 0 && $i < 10} {incr i} {
  87     gdb_continue_to_breakpoint "thread 5's print, pass: $i"
  88     send_gdb "info threads\n"
  89     gdb_expect {
  90         -re "\\* 5 Thread .*  print_philosopher .*\r\n$gdb_prompt $" {
  91             # Okay this time.
  92         }
  93         -re ".*$gdb_prompt $" {
  94             set only_five 0
  95         }
  96         timeout {
  97             set only_five -1
  98         }
  99     }
 100 }
 101
 102 set name "thread-specific breakpoint is thread-specific"
 103 if {$only_five ==  1} { pass $name }
 104 if {$only_five ==  0} { fail $name }
 105 if {$only_five == -1} { fail "$name (timeout)" }
 106
 107
 108 ### Select a particular thread.
 109 proc select_thread {thread} {
 110     global gdb_prompt
 111
 112     send_gdb "thread $thread\n"
 113     gdb_expect {
 114         -re "\\\[Switching to thread .*\\\].*\r\n$gdb_prompt $" {
 115             pass "selected thread: $thread"
 116         }
 117         -re "$gdb_prompt $" {
 118             fail "selected thread: $thread"
 119         }
 120         timeout {
 121             fail "selected thread: $thread (timeout)"
 122         }
 123     }
 124 }
 125
 126 ### Select THREAD, check for a plausible backtrace, and make sure
 127 ### we're actually selecting a different philosopher each time.
 128 ### Return true if the thread had a stack which was not only
 129 ### acceptable, but interesting.  SEEN should be an array in which
 130 ### SEEN(N) exists iff we have found philosopher number N before.
 131 proc check_philosopher_stack {thread seen_name} {
 132     global gdb_prompt
 133     upvar $seen_name seen
 134
 135     set name "philosopher is distinct: $thread"
 136     set interesting 0
 137
 138     select_thread $thread
 139     send_gdb "where\n"
 140     gdb_expect {
 141         -re ".* in philosopher \\(data=(0x\[0-9a-f\]+).*\r\n$gdb_prompt $" {
 142             set data $expect_out(1,string)
 143             if {[info exists seen($data)]} {
 144                 fail $name
 145             } else {
 146                 pass $name
 147                 set seen($data) yep
 148             }
 149             set interesting 1
 150         }
 151         -re "pthread_start_thread.*\r\n$gdb_prompt $" {
 152             ## Maybe the thread hasn't started yet.
 153             pass $name
 154         }
 155         -re " in \\?\\?.*\r\n$gdb_prompt $" {
 156             ## Sometimes we can't get a backtrace.  I'm going to call
 157             ## this a pass, since we do verify that at least one
 158             ## thread was interesting, so we can get more consistent
 159             ## test suite totals.  But in my heart, I think it should
 160             ## be an xfail.
 161             pass $name
 162         }
 163         -re "$gdb_prompt $" {
 164             fail $name
 165         }
 166         timeout {
 167             fail "$name (timeout)"
 168         }
 169     }
 170
 171     return $interesting
 172 }
 173
 174 set any_interesting 0
 175 array set seen {}
 176 for {set i 3} {$i <= 7} {incr i} {
 177     if [check_philosopher_stack $i seen] {
 178         set any_interesting 1
 179     }
 180 }
 181
 182 if {$any_interesting} {
 183     pass "found an interesting thread"
 184 } else {
 185     fail "found an interesting thread"
 186 }