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# Copyright 2015-2021 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
# Test running a program that spawns enough threads that the tid of an
# exited thread is reused. GDB should not crash when this happens.
if {[prepare_for_testing "failed to prepare" $testfile $srcfile { debug pthreads }] == -1} {
return -1
if ![runto_main] {
return -1
# Avoid dumping a ton of thread create/exit info in the logs.
gdb_test_no_output "set print thread-events off"
gdb_breakpoint "after_count"
gdb_continue_to_breakpoint "after_count"
# Get value of VARIABLE in the inferior.
proc getvar {variable} {
global decimal
global gdb_prompt
set value 0
set msg "get $variable"
gdb_test_multiple "print $variable" $msg {
-re " = ($decimal)\r\n$gdb_prompt $" {
set value $expect_out(1,string)
pass $msg
return $value
set reuse_time [getvar "reuse_time"]
# Now the real test. Run to a breakpoint in a thread that exits
# immediately once resumed. The thread ends up left on the thread
# list, marked exited (exactly because it's the selected thread).
gdb_breakpoint "do_nothing_thread_func"
gdb_continue_to_breakpoint "do_nothing_thread_func"
# Let the program continue, constantly spawning short-lived threads
# (one at a time). On some targets, after a bit, a new thread reuses
# the tid of the old exited thread that we still have selected. GDB
# should not crash in this situation. Of course, if the tid number
# space is shared between all processes in the system (such as on
# Linux), there's a chance that some other process grabs the TID, but
# that can never cause a spurious test fail.
gdb_breakpoint "after_reuse_time"
# Higher than what the test program sleeps before exiting.
set timeout [expr $reuse_time * 2]
gdb_continue_to_breakpoint "after_reuse_time"