1# Copyright 2015-2023 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 19standard_testfile 20 21if {[prepare_for_testing "failed to prepare" $testfile $srcfile { debug pthreads }] == -1} { 22 return -1 23} 24 25if ![runto_main] { 26 return -1 27} 28 29delete_breakpoints 30 31# Avoid dumping a ton of thread create/exit info in the logs. 32gdb_test_no_output "set print thread-events off" 33 34gdb_breakpoint "after_count" 35gdb_continue_to_breakpoint "after_count" 36 37# Get value of VARIABLE in the inferior. 38 39proc 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 55set 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). 60gdb_breakpoint "do_nothing_thread_func" 61gdb_continue_to_breakpoint "do_nothing_thread_func" 62 63delete_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. 72gdb_breakpoint "after_reuse_time" 73 74# Higher than what the test program sleeps before exiting. 75set timeout [expr $reuse_time * 2] 76 77gdb_continue_to_breakpoint "after_reuse_time" 78