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

   1 # Copyright 2015-2022 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 if ![runto_main] {
  26     return -1
  27 }
  28
  29 delete_breakpoints
  30
  31 # Avoid dumping a ton of thread create/exit info in the logs.
  32 gdb_test_no_output "set print thread-events off"
  33
  34 gdb_breakpoint "after_count"
  35 gdb_continue_to_breakpoint "after_count"
  36
  37 # Get value of VARIABLE in the inferior.
  38
  39 proc getvar {variable} {
  40     global decimal
  41     global gdb_prompt
  42
  43     set value 0
  44
  45     set msg "get $variable"
  46     gdb_test_multiple "print $variable" $msg {
  47         -re " = ($decimal)\r\n$gdb_prompt $" {
  48             set value $expect_out(1,string)
  49             pass $msg
  50         }
  51     }
  52     return $value
  53 }
  54
  55 set reuse_time [getvar "reuse_time"]
  56
  57 # Now the real test.  Run to a breakpoint in a thread that exits
  58 # immediately once resumed.  The thread ends up left on the thread
  59 # list, marked exited (exactly because it's the selected thread).
  60 gdb_breakpoint "do_nothing_thread_func"
  61 gdb_continue_to_breakpoint "do_nothing_thread_func"
  62
  63 delete_breakpoints
  64
  65 # Let the program continue, constantly spawning short-lived threads
  66 # (one at a time).  On some targets, after a bit, a new thread reuses
  67 # the tid of the old exited thread that we still have selected.  GDB
  68 # should not crash in this situation.  Of course, if the tid number
  69 # space is shared between all processes in the system (such as on
  70 # Linux), there's a chance that some other process grabs the TID, but
  71 # that can never cause a spurious test fail.
  72 gdb_breakpoint "after_reuse_time"
  73
  74 # Higher than what the test program sleeps before exiting.
  75 set timeout [expr $reuse_time * 2]
  76
  77 gdb_continue_to_breakpoint "after_reuse_time"