gdb/testsuite/gdb.threads/tid-reuse.exp

   1 # Copyright 2015-2016 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 # Test running a program that spawns enough threads that the tid of an
  17 # exited thread is reused.  GDB should not crash when this happens.
  18
  19 standard_testfile
  20
  21 if {[prepare_for_testing "failed to prepare" $testfile $srcfile { debug pthreads }] == -1} {
  22     return -1
  23 }
  24
  25 clean_restart ${binfile}
  26
  27 if ![runto main] {
  28     fail "can't run to main"
  29     return -1
  30 }
  31
  32 delete_breakpoints
  33
  34 # Avoid dumping a ton of thread create/exit info in the logs.
  35 gdb_test_no_output "set print thread-events off"
  36
  37 gdb_breakpoint "after_count"
  38 gdb_continue_to_breakpoint "after_count"
  39
  40 # Get value of VARIABLE in the inferior.
  41
  42 proc getvar {variable} {
  43     global decimal
  44     global gdb_prompt
  45
  46     set value 0
  47
  48     set msg "get $variable"
  49     gdb_test_multiple "print $variable" $msg {
  50         -re " = ($decimal)\r\n$gdb_prompt $" {
  51             set value $expect_out(1,string)
  52             pass $msg
  53         }
  54     }
  55     return $value
  56 }
  57
  58 set reuse_time [getvar "reuse_time"]
  59
  60 # Now the real test.  Run to a breakpoint in a thread that exits
  61 # immediately once resumed.  The thread ends up left on the thread
  62 # list, marked exited (exactly because it's the selected thread).
  63 gdb_breakpoint "do_nothing_thread_func"
  64 gdb_continue_to_breakpoint "do_nothing_thread_func"
  65
  66 delete_breakpoints
  67
  68 # Let the program continue, constantly spawning short-lived threads
  69 # (one at a time).  On some targets, after a bit, a new thread reuses
  70 # the tid of the old exited thread that we still have selected.  GDB
  71 # should not crash in this situation.  Of course, if the tid number
  72 # space is shared between all processes in the system (such as on
  73 # Linux), there's a chance that some other process grabs the TID, but
  74 # that can never cause a spurious test fail.
  75 gdb_breakpoint "after_reuse_time"
  76
  77 # Higher than what the test program sleeps before exiting.
  78 set timeout [expr $reuse_time * 2]
  79
  80 gdb_continue_to_breakpoint "after_reuse_time"