| # Copyright (C) 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 |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # 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 <http://www.gnu.org/licenses/>. |
| |
| # This test exercises the case of stopping for a breakpoint hit of one |
| # thread, then switching to a thread that has a status pending and |
| # continuing. |
| |
| if [target_info exists gdb,nointerrupts] { |
| verbose "Skipping continue-pending-status.exp because of nointerrupts." |
| return |
| } |
| |
| standard_testfile |
| |
| if [prepare_for_testing "failed to prepare" $testfile $srcfile {debug pthreads}] { |
| return -1 |
| } |
| |
| if ![runto_main] { |
| untested "could not run to main" |
| return -1 |
| } |
| |
| set break_line [gdb_get_line_number "break here"] |
| |
| # Return current thread's number. |
| |
| proc get_current_thread {} { |
| global gdb_prompt |
| |
| set thread "" |
| set msg "get thread number" |
| gdb_test_multiple "print /x \$_thread" $msg { |
| -re "\\$\[0-9\]* = (0x\[0-9a-zA-Z\]+).*$gdb_prompt $" { |
| set thread $expect_out(1,string) |
| pass "$msg" |
| } |
| } |
| return ${thread} |
| } |
| |
| # There are two threads in the program that are running the same tight |
| # loop, where we place a breakpoint. Sometimes we'll get a breakpoint |
| # trigger for thread 2, with the breakpoint event of thread 3 pending, |
| # other times the opposite. The original bug that motivated this test |
| # depended on the event thread being the highest numbered thread. We |
| # try the same multiple times, which should cover both threads |
| # reporting the event. |
| |
| set attempts 20 |
| |
| # These track whether we saw events for both threads 2 and 3. If the |
| # backend always returns the breakpoint hit for the same thread, then |
| # it fails to make sure threads aren't starved, and we'll fail the |
| # assert after the loop. |
| set saw_thread_2 0 |
| set saw_thread_3 0 |
| |
| for {set i 0} {$i < $attempts} {incr i} { |
| with_test_prefix "attempt $i" { |
| gdb_test "b $srcfile:$break_line" \ |
| "Breakpoint .* at .*$srcfile, line $break_line.*" \ |
| "set break in tight loop" |
| gdb_test "continue" \ |
| "$srcfile:$break_line.*" \ |
| "continue to tight loop" |
| |
| # Switch to the thread that did _not_ report the event (and |
| # thus may have a pending status). At the time this test was |
| # written this was necessary to make linux-nat.c short-circuit |
| # the resume and go straight to consuming the pending event. |
| set thread [get_current_thread] |
| if {$thread == 2} { |
| incr saw_thread_2 |
| set thread 3 |
| } else { |
| incr saw_thread_3 |
| set thread 2 |
| } |
| gdb_test "thread $thread" \ |
| "Switching to thread $thread .*" \ |
| "switch to non-event thread" |
| |
| # Delete all breakpoints so that continuing doesn't switch |
| # back to the event thread to do a step-over, which would mask |
| # away the original bug, which depended on the event thread |
| # still having TARGET_STOPPED_BY_SW_BREAKPOINT stop_reason. |
| delete_breakpoints |
| |
| # In the original bug, continuing would trigger an internal |
| # error in the linux-nat.c backend. |
| |
| set msg "continue for ctrl-c" |
| gdb_test_multiple "continue" $msg { |
| -re "Continuing" { |
| pass $msg |
| } |
| } |
| |
| # Wait a bit for GDB to give the terminal to the inferior, |
| # otherwise ctrl-c too soon can result in a "Quit". |
| sleep 1 |
| send_gdb "\003" |
| |
| set msg "caught interrupt" |
| gdb_test_multiple "" $msg { |
| -re "Thread .* received signal SIGINT.*$gdb_prompt $" { |
| pass $msg |
| } |
| } |
| } |
| } |
| |
| verbose -log "saw_thread_2=$saw_thread_2" |
| verbose -log "saw_thread_3=$saw_thread_3" |
| |
| gdb_assert {$saw_thread_2 > 0 && $saw_thread_3 > 0} "no thread starvation" |